6mm max cartridge

6mm dasher maximum cartridge / minimum chamber unless otherwise noted all diameters -.008 cartridge noted: b = basic = reference dimension = headspace dimension * dimensions are to intersections of lines ... title: 6mm dasher author: ptrsn\zachary.aaron (zach-desktop) created date: 9/1/2021 1:37:33 pm ...

6mm max cartridge. The 6mm Creedmoor is a ballistically talented. cartridge offering long range precision and. wind-bucking abilities. Patrick used a Ruger. Precision Rifle chambered in 6mm CM to. snipe this Montana prairie dog at 564 yards in a. moderate breeze. The 6.5 Creedmoor (CM), created from a .30 Thompson/Center parent case, was released in 2008.

The 6mm MAX AR Cartridge is an impressive addition to the Sons Of Liberty Gunworks portfolio. Boasting the power to handle up to 55k psi chamber …

Sep 17, 2023 · The main thing I like about the 6mm Max for a military consideration is the compactness of the cartridge stack, while still bringing 8-10grs more powder under 65-75gr bullet weights when compared with the 5.56x45. 6mm TCU (Accurate Loading Guide #2) Warning! Notes: This cartridge is essentially the .223 Remington case necked up to 6mm. Gun: Douglas; barrel length: 14"; primer: CCI 400; case: Rem; max length: 1.760"; trim length: 1.740"; OAL max: 2.520". Be Alert: Publisher cannot be responsible for errors in published load data. Wt. Bullet.The Alpha Munitions brass is exceptional, produced to very tight tolerances, and about $1.15 per piece. Both types of brass use small rifle primers, which is in keeping with the 6 BR cartridges. While the accuracy benefits of large vs. small primers is debatable, a small rifle primer does extend the life of the brass.Factory Ammunition. Remington now list only one load for the .244/6mm, the 100 grain Core-Lokt at an advertised 3100fps for a realistic 3030fps in 22” barrels. This load is not suitable for the twist rate of the original .244 rifles, suited only to rifles stamped 6mm Remington or custom rifles with the appropriate twist rate.Where the 6mm BR is a 2,850-fps performer for 3,000 to 3,500 rounds using 105-grain bullets, the 6mm Creedmoor-sized cases are around 3,100 to 3,150 fps for 1,500 rounds and the Dasher is 3,000 fps for 2,200 to 2,500 rounds. We have a middle child here that is an easily formed wildcat off the 6.5×47 Lapua parent case.The 6mm Remington rifle cartridge, originally introduced in 1955 by Remington Arms Company as the .244 Remington, is based on a necked down .257 Roberts cartridge (itself a necked-down 7×57mm Mauser) …6mm Max Reviewed By Ray Helms On His X-Ring Channel. By BCPadmin. Read more. 0. BCPadmin; Mar 12 2023. BC Precision Ballistics Obtains Trademark for 6mm MAX® ...

3. Factory ammo is not common. 4. Every once in awhile there is a Lapua brass shortage, but if you get 300 or 400 pieces you could be set for a really long time. 5. Energy on target is less making splash and point of impact harder to see compared to a really fast 6mm or a 6.5mm.Launched in 2020, the cartridge continues to gain popularity. (Photo credit: Hornady) Hornady has the following to say about the cartridge: Tested, selected, and fielded by a specialized group within the U.S. DoD for its multipurpose combat rifle program, the versatile 6mm ARC does much of what larger cartridges can and everything that …The dosage of Mucinex Fast-Max for adults and children over age 12 is 20 milliliters of liquid or two caplets every four hours, according to the Mucinex website. Children under the...Does it make a difference that 6mm Max uses standard AR15 bolts? Parent cartridge is 350 Legend. Seems pretty legit to me; all the performance charts show chamber pressures at or below 54k PSI. ETA: The video does mention that 6mm Max is going through SAAMI testing right now. Using the 5.56 bolt is a bonus, to what end, however?Jul 22, 2018. 907. 897. Mar 13, 2020. #1. I hadn't seen this posted here yet, but SAAMI added a 6mm Grendel derivative called the 6mm Advanced Rifle Cartridge or 6mm ARC to their newly accepted cartridges list. 6mm ARC introduction pdf. The case looks like the shoulder has been moved back, and the neck is a little shorter as compared to a ...

With the 115gr DTAC, the 6XC is now a viable long-range cartridge with ballistics that rival a 6.5-284 shooting a 142gr SMK at 2950 fps. This means that a Cross-course shooter can now use one rifle and one cartridge for all events. To order DTAC 115gr bullets or 6XC brass, contact Superior Shooting Systems: (806) 323-9488.The 6x45mm, or 6mm/.223 Remington, is such a cartridge. The goal with this one to create a more accurate benchrest contender. ... Hornady’s V-MAX is the consummate varmint bullet, the 75-grain 6mm version including a streamlined boat-tail and red polymer tip to create a .330 G1 BC – the highest of all bullets tested here. It was paired with ...When it comes to real estate, the name RE/MAX stands out as one of the most trusted and reputable companies in the industry. With a long history of success and a global presence, R...The cartridge case for the “6mm Optimum” would naturally have to be larger than that of 5.56 NATO, but it would also be significantly smaller than 7.62 NATO. To minimize cartridge case volume, muzzle velocity might have to be limited to perhaps 2900-2950 fps, but this should still produce exceptional performance. ....500 Auto Max.500 Black Powder Express.500 Jeffery.500 Nitro Express.500 Schüler ... 6mm ARC; 6mm BR Remington; 6mm Creedmoor; 6mm Lee Navy; 6mm Musgrave; 6mm PPC; 6mm Remington; 6mm TCU; 6mm XC; ... Cartridge and reloading info can be found at Accurate Reloading This page was last edited on 7 ...

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Sep 16, 2023 · New Cartridge! The 6mm MAX. X-RING. 128K subscribers. Subscribed. 2.2K. 58K views 5 months ago TEXAS. This is a new cartridge that is awesome in a small frame AR. ...more. Pressure Testing 6mm MAX. Energetic Materials Research and Testing Center. With months of planning, ... Cartridge cases were supplied by BCPB primer with CCI #41 primers. Various bullets weights and types from various manufacturers were tested with a range of propellants. Bullet weights tested were 55, 58, 65, 70, 75, 77, 80, 87, 90, …The 6mm ARC’s exterior ballistics are good, enough thanks to its use of high BC projectiles, to allow it to run with the .308 Winchester when shooting long. The recoil impulse of the 6.5mm Grendel is also significantly heavier than 5.56x45mm. It is also much harder to control on full-automatic. The 6mm Remington rifle cartridge, originally introduced in 1955 by Remington Arms Company as the .244 Remington, is based on a necked down .257 Roberts cartridge (itself a necked-down 7×57mm Mauser) using a .24/6mm bullet. Known for a combination of high velocity, long range, flat trajectory, and accuracy, it is suitable as a dual use hunting ... The 6mm ARC offers a 30 to 35% lighter-weight package (gun and ammo). 223/5.56. The 6mm ARC achieves substantially better ballistics than the 223/5.56. It delivers less drop, less wind deflection and the ability to shoot accurate groups at much greater distance (1000+ yds). 224 Valkyrie. .500 Auto Max.500 Black Powder Express.500 Jeffery.500 Nitro Express.500 Schüler ... 6mm ARC; 6mm BR Remington; 6mm Creedmoor; 6mm Lee Navy; 6mm Musgrave; 6mm PPC; 6mm Remington; 6mm TCU; 6mm XC; ... Cartridge and reloading info can be found at Accurate Reloading This page was last edited on 7 ...

The 6x45mm, or 6mm/.223 Remington, is such a cartridge. The goal with this one to create a more accurate benchrest contender. ... Hornady’s V-MAX is the consummate varmint bullet, the 75-grain 6mm version including a streamlined boat-tail and red polymer tip to create a .330 G1 BC – the highest of all bullets tested here. It was paired with ...Walmart accepts ink cartridges for recycling. Both HP and Kodak list Walmart as an authorized recycling facility for their branded ink cartridges. HP stipulates that not all locati...Today we go over some of the velocity differences of the 6MAX and 5.56.We built two identical blasters, both with the barrel length of 10.5".Showcasing the d...The 6mm BR magazine is offered for the 6mm BR and family of cartridges, and are available in 12 round capacity. ... 2.870” max cartridge overall length (COAL) with binder plate; 2.960” max cartridge overall length (COAL) without binder plate (see limitations below) 2.52” Rear Height; 3 and 7-Round Magazines for .300WSM / 6.5 PRC:The Ultimate Long Range 6mm. The 6mm Super LR is a 6mm wildcat cartridge similar in size to a .243 Winchester. It was designed for rifles (bolt guns and semi-automatic rifles) that have a .308 bolt face and can handle a cartridge of that size. It is not suitable for use with an AR-15, but will work out of rifles like a short action Remington ...The 6mm arc was released during 2020 and has been accepted as a DMR cartridge but I’m not sure it’s been recognized for its potential. ... But I do believe the possibilities exist where the 6mm arc or 6mm max can run well in bench rest competition. There just isn’t enough data out there. corpsman8483. 11-27-2023, 12:38 AM.Learn about the 6mm MAX, a new cartridge for long range shooting, from Ray Helms, a professional shooter and instructor.The first major difference is the case length with the 6mm Rem being the longer of the two. The 243 has a case length of 2.045” while the 6mm Rem measures 2.233” long. This trend continues with overall length as the 243 has a maximum overall length of 2.7098” compared to 2.825” for the 6mm round.

BAT TR action (stolen from 6mm Dasher barreled Action) Krieger Match Grade 1:7.5 twist, 5-groove barrel (which I plan to finish off at 26”) Area 419 Hellfire Muzzle Brake; The Tools: Precision Matthews TL-1660 Lathe; SSG True Bore Alignment System (TBAS) and SSG Range Rod; Alpha 6GT Carbide Reamer; Dave Manson 6GT Go …

The dosage of Mucinex Fast-Max for adults and children over age 12 is 20 milliliters of liquid or two caplets every four hours, according to the Mucinex website. Children under the...Replacing ink cartridges in your printer can be a daunting task, but it doesn’t have to be. With this step-by-step guide, you’ll be able to quickly and easily install new ink cartr...12 Nov 2017 ... No foxes here but given it's under light, you'd be shooting at maybe 250yds max? If that's the case, a 6BR would be fine. You'd be talking a .....SAAMI New Cartridge & Chamber Maximum Average Pressure (MAP)* = 52,000 psi Instrumental Velocity**: 108-gr @ 2,700 fps Crusher pressure limits not established. (** - Velocity based on a 24” Test %arrel) * Refer to ANSI/SAAMI Z299.4 for pressure guideline interpretation description.6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma Improved, gun barrels, powders, primers, …Sherman Max is a new case design that offers more capacity and performance than the standard SAUM case for the 6mm and 6.5mm cartridges. It is ideal for medium length …A propriety cartridge, from a boutique developer, with 100 FPS MV - which is less than 65 yards diff for equivalent ballistic performance - over a SAMMI cartridge, with the provenance of Hornady, and market momentum behind it? ... ETA: The video does mention that 6mm Max is going through SAAMI testing right now. Last edited by …Aug 20, 2020 · Many 6mm-caliber cartridges are used for various shooting purposes because they provide excellent accuracy and light recoil. Some of the greats are (from left) 6mm BR Norma, 24 Nosler, .243 Winchester, 6mm Remington, and .240 Weatherby Magnum. August 20, 2020 By Steve Gash. Only a few metric calibers have been really popular in the United ...

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The 6mm MAX AR Cartridge is an impressive addition to the Sons Of Liberty Gunworks portfolio. Boasting the power to handle up to 55k psi chamber …The 6mm ARC also performs better in wind. In a 10-mph crosswind the 6mm ARC 108-grain bullet drifts 10.9 inches at 400 yards. The .223 75-grain bullet, by contrast, drifts more than 15 inches at that range, and the ARC’s advantage becomes more pronounced at longer ranges. The .223 does have advantages, though.I shot the SOLGW Broadsword in the Tactical Sniper Series DMR Finale. Find out how the cartridge performed and my final thoughts on it.For a main battle cartridge able to carry the goods to 600-800 meters in a suppressive fire mode from a machine gun, and to 500-600 meters from a rifle, I suggest the 6x45mm (6mm-223) or the similar 6mm PPC. The 6x45 is the 5.56 NATO (.223 Remington) cartridge case necked up to accept 6mm (.243") bullets. It should be able to drive an 85 …6mm 223 aka 6 x 45 ... I've checked and I can seat a 105 A-max to fit in my magazine (2.36" COAL). ... This cartridge has become quite popular in ...The dosage of Mucinex Fast-Max for adults and children over age 12 is 20 milliliters of liquid or two caplets every four hours, according to the Mucinex website. Children under the...Re: **6mm cartridges and corresponding barrel life**. 6mm-250 or 6-250 AI is a great little round that's been winning High Power XTC matches for a few decades. It's essentially a 6mm version of the 6.5CM. If you run Lapua 22-250 brass through an elliptical expander module up to 6mm the prep work is done.The ability to run heavies at 3250fps or lightweights at 4400fps might just make this the most versatile 6mm on the planet. By the way, if you ask me about b... Javascript is required. Please enable javascript before you are allowed to see this page. ….

Jun 3, 2020 · The 6mm ARC was designed around optimal use with a 108-grain bullet. In addition to making the cartridge useable with long, heavy-for-caliber bullets, Hornady also set maximum chamber pressure low at 52,000 pounds per square inch. This slows extraction and makes it much less violent, prolonging the bolt’s life. The 6mm Advanced Rifle Cartridge (6 ARC) by Hornady is a new cartridge that can fire a sleek 6mm (.243) caliber projectile around 2,700 fps with minimal recoil and the 6mm ARC is short enough to fit within the dimensions of a standard AR-15 magazine and it performs very well out of an AR-15 with an 18 inch barrel (what we tested).Top 6 Long-Range Competition Cartridges. Searching for the best long-range competition cartridge? Look no further. (L-R) 6.5 Creedmoor, 6mm Creedmoor, .223 Remington, .308 Winchester, 7mm SAUM, .300 Win. Mag. July 08, 2019 By Joseph von Benedikt. It’s a thankless job, but somebody’s got to point you toward the best of the best.This 6mm wildcat based on the common .223 Rem offers excellent accuracy and very low recoil — something very important in the cross-the-course discipline. In addition, Ron’s 95gr load with Reloder 15 delivered an ES of just 4 fps over ten shots. That exceptionally low ES helps achieve minimal vertical dispersion at 600 yards.Sep 21, 2019. #1. Hi everyone, I was wondering if any of you can provide advice/experience on a good 6mm AR15 cartridge. I plan on building a competition upper with a 18"-20" barrel for my lightweight AR15 which I use for 3 gunning. In terms of usage requirements in order of priority: 1) can be reliably loaded in normal AR15 magazines up to 10 ...The 6mm MAX is pressure tested to SAAMI standards of 55k psi. It is a brand new cartridge designed for the unmodified mil-spec .378 bolt face, and a full mass bolt carrier group. The 6mm MAX holds 35 grains of water capacity which ultimately determines the energy potential of the cartridge. In this case, 1750+Lbs of energy.SLC, Utah. Oct 14, 2023. #77. The 6mm Max appears to be what 5.56 should have been though. If their numbers are legitimate and not baked, it looks like you can load as many rounds in the same size mags more or less, spit a 55gr at original SCHV velocity objectives, then also shoot 100gr to 2750fps from a 24” barrel.This cartridge is not a .223 or a variant there of. The 6mm MAX parent is the .350 legend and holds 35 grains of water . A .223 holds 28grns. It’s more than 3% , I’ll let you do the math. We load 55gr -100gr bullets all @2.300 and magazine feed without mods. we’ve spent 100’s of hours studying bullet lengths and ogive’s to achieve this. Long review of the 6mm Max vs. the 6 ARC for DMR competitions. We also discuss what you need to know about DMR style competitions. 6mm max cartridge, New Cartridge, 6mm MAX The Art of the Rifle: General, 8.6mm Blackout (8.6×43 mm), also sometimes referred to as 8.6 BLK, is a centerfire rifle cartridge developed by the firearms manufacturer Q, LLC. It utilizes a shortened case from the 6.5mm Creedmoor necked up to an 8.6 mm caliber (8.585 mm or 0.338 in diameter) projectile. 8.6 Blackout is designed for use in bolt-action rifles or as a caliber ..., I shot the SOLGW Broadsword in the Tactical Sniper Series DMR Finale. Find out how the cartridge performed and my final thoughts on it., I shot the SOLGW Broadsword in the Tactical Sniper Series DMR Finale. Find out how the cartridge performed and my final thoughts on it., Top 6 Long-Range Competition Cartridges. Searching for the best long-range competition cartridge? Look no further. (L-R) 6.5 Creedmoor, 6mm Creedmoor, .223 Remington, .308 Winchester, 7mm SAUM, .300 Win. Mag. July 08, 2019 By Joseph von Benedikt. It’s a thankless job, but somebody’s got to point you toward the best of the best., The cartridge is also well suited for handloaders and since it uses the same .243″ bullets as 6mm cartridges like the .243 Winchester, the 6x47mm Lapua, the 6XC, and the .240 Weatherby Magnum, there are a variety of great .243″ bullets currently available., If 6mm MAX brings 6ARC type performance to a rifle using a 5.56 bolt, that's a pretty big deal. I've been shooting and loading 6.5 Grendel for nearly 20 years and 6mm MAX has my attention in a way 6ARC never did. ... This cartridge has a completely new case with a slightly larger base than the .223 Remington, however, its rim is rebated to .378 ..., The 6mm Creedmoor is a ballistically talented. cartridge offering long range precision and. wind-bucking abilities. Patrick used a Ruger. Precision Rifle chambered in 6mm CM to. snipe this Montana prairie dog at 564 yards in a. moderate breeze. The 6.5 Creedmoor (CM), created from a .30 Thompson/Center parent case, was released in 2008., For the cartridges with larger case heads, you get the same amount of powder or less than the 6mm MAX. The end result is that the 6mm MAX (35 grs) allows for a .378 mil-spec bolt face with full lug integrity and powder to push the heavies at useful velocities. The 6mm MAX has unlocked the code on the .378 bolt face AR-15 cartridge., The ability to run heavies at 3250fps or lightweights at 4400fps might just make this the most versatile 6mm on the planet. By the way, if you ask me about b..., 6mm Dasher Load Data. 6 & 6.5 Creedmoor Load Data(this article) 6BRX, 6BRA, and 6BR Load Data. 6 & 6.5×47 Lapua Load Data. 6XC Load Data. While I’d feel fortunate to know what load any of these top shooters are running, this set of data is the aggregate of well over 100 truly world-class shooters, so what a rich and unique data set …, 22 Advanced Rifle Cartridge; 22 Creedmoor; 22 Nosler; 224 Valkyrie; 277 SIG FURY; 28 Gauge 3″ 6mm Advanced Rifle Cartridge; 6mm Creedmoor; 6mm GT; 6.5-284 Norma; 6.5-300 Weatherby Magnum; 6.5 Precision Rifle Cartridge; 6.5 Weatherby Rebated Precision Magnum; 6.8 True Velocity Composite; 6.8 Western; 7mm Precision Rifle Cartridge; 30 …, 6mm ARC. Designated the “Advanced Rifle Cartridge,” the 6mm ARC makes a potent argument for being the best AR-15 cartridge ever designed. An AR-15 is a superb tool for predator hunting. This big male came a half-mile on the run, responding to a rabbit distress call, and dropped to a single shot from a 6mm ARC., .500 Auto Max.500 Black Powder Express.500 Jeffery.500 Nitro Express.500 Schüler ... 6mm ARC; 6mm BR Remington; 6mm Creedmoor; 6mm Lee Navy; 6mm Musgrave; 6mm PPC; 6mm Remington; 6mm TCU; 6mm XC; ... Cartridge and reloading info can be found at Accurate Reloading This page was last edited on 7 ..., The Ultimate Long Range 6mm. The 6mm Super LR is a 6mm wildcat cartridge similar in size to a .243 Winchester. It was designed for rifles (bolt guns and semi-automatic rifles) that have a .308 bolt face and can handle a cartridge of that size. It is not suitable for use with an AR-15, but will work out of rifles like a short action Remington ..., The 6mm ARC cartridge is a new SAAMI-spec cartridge based on the 6.5 Grendel case necked down for 6mm bullets, with the shoulder moved back 0.030. Yes it is designed to run in AR15-platform rifles. You’ll need a new barrel, bolt, and mags. If you already have an AR chambered in 6.5 Grendel, the ONLY thing you need to change is the barrel., As mentioned earlier, it offers a slight ballistic advantage over its Winchester rival. Remington chose the 7×57 Mauser cartridge as the parent case for its 6mm offering, which gives it a slightly greater powder capacity than the .308 based .243. It also provides a slightly longer cartridge neck, which most handloaders prefer, including this one., The first major difference is the case length with the 6mm Rem being the longer of the two. The 243 has a case length of 2.045” while the 6mm Rem measures 2.233” long. This trend continues with overall length as the 243 has a maximum overall length of 2.7098” compared to 2.825” for the 6mm round. , 6mm MAX (is SAAMI) designed by Brian with BC Precision ballistics. Being marketed through Sons of Liberty Gun works. Partnering with Starline for brass. supposed to be available to the public in november 2023. uses standard 223/5.56 bolt face (only needs a barrel change) 350 legend is the parent cartridge. Geared towards PRS., The X-Ring just dropped a video about a new cartridge called 6 MAX. Seems the goal was to try and eliminate some of the shortcomings of 6 ARC, like how it chews through bolts. Seems the goal was to try and eliminate some of the shortcomings of 6 ARC, like how it chews through bolts. , Many 6mm-caliber cartridges are used for various shooting purposes because they provide excellent accuracy and light recoil. Some of the greats are (from left) 6mm BR Norma, 24 Nosler, .243 Winchester, 6mm Remington, and .240 Weatherby Magnum. August 20, 2020 By Steve Gash. Only a few metric calibers have been really popular in the United ..., The 6mm ARC’s exterior ballistics are good, enough thanks to its use of high BC projectiles, to allow it to run with the .308 Winchester when shooting long. The recoil impulse of the 6.5mm Grendel is also significantly heavier than 5.56x45mm. It is also much harder to control on full-automatic., We talk about the 6mm Max cartridge from BC Precision Ballistics, the build specs for the General Purpose division, and the new Broadsword rifle from Sons of …, The 6mm ARC falls between the .223 Remington/5.56 NATO and larger cartridges like the 6.5mm Creedmoor. It offers improved long-range performance compared to the .223 Remington while maintaining compatibility with the AR-15 platform. The 6.5mm Creedmoor uses the AR-10 platform, a heavier and, as mentioned, less …, Apple’s latest release, the iPhone 14 Pro Max, is making waves in the tech world. With its impressive features and sleek design, it’s no surprise that many people are considering u..., Sent from my SM-G970U using Tapatalk. If 6mm MAX brings 6ARC type performance to a rifle using a 5.56 bolt, that's a pretty big deal. I've been shooting and loading 6.5 Grendel for nearly 20 years and 6mm MAX has my attention in a way 6ARC never did. Scout Rider for the Mongol Hordes., The 6mm ARC’s exterior ballistics are good, enough thanks to its use of high BC projectiles, to allow it to run with the .308 Winchester when shooting long. The recoil impulse of the 6.5mm Grendel is also significantly heavier than 5.56x45mm. It is also much harder to control on full-automatic., 12 Nov 2017 ... No foxes here but given it's under light, you'd be shooting at maybe 250yds max? If that's the case, a 6BR would be fine. You'd be talking a ....., Sent from my SM-G970U using Tapatalk. If 6mm MAX brings 6ARC type performance to a rifle using a 5.56 bolt, that's a pretty big deal. I've been shooting and loading 6.5 Grendel for nearly 20 years and 6mm MAX has my attention in a way 6ARC never did. Scout Rider for the Mongol Hordes., The 6mm ARC also performs better in wind. In a 10-mph crosswind the 6mm ARC 108-grain bullet drifts 10.9 inches at 400 yards. The .223 75-grain bullet, by contrast, drifts more than 15 inches at that range, and the ARC’s advantage becomes more pronounced at longer ranges. The .223 does have advantages, though., Dec 19, 2023 · The 6mm ARC cartridge is a new SAAMI-spec cartridge based on the 6.5 Grendel case necked down for 6mm bullets, with the shoulder moved back 0.030. Yes it is designed to run in AR15-platform rifles. You’ll need a new barrel, bolt, and mags. If you already have an AR chambered in 6.5 Grendel, the ONLY thing you need to change is the barrel. , The 6mm Creedmoor is a short action cartridge. Its case holds 50 grains of water, compared to 54 grains of water for the .243 Winchester and 47 grains for the 6mm Lapua. The rim diameter is the usual .473". The case head diameter is .470" and the body diameter behind the shoulder is .462", so there is very little body taper to ease extraction., Sep 21, 2019. #1. Hi everyone, I was wondering if any of you can provide advice/experience on a good 6mm AR15 cartridge. I plan on building a competition upper with a 18"-20" barrel for my lightweight AR15 which I use for 3 gunning. In terms of usage requirements in order of priority: 1) can be reliably loaded in normal AR15 magazines up to 10 ...