Or are people still running it ?
I always seem to be late to the show but I would like to build an upper and this caliber really has me intrigued, maybe it does not function properly in the AR platform, can anyone confirm this has anyone done an AR in the 6 mm grinch ?
I have read and reread all of the past grinch posts, I like the idea of 103 grain bullet at 2900 ft./s which seems to be the norm, I also like the fact that it’s different and not mainstream.
I get it, brass is probably a PIA to form, neck looks awful short and there seems to be the reamer size issues, but I would like to move forward, John
JB.
I agree with Guns and Gunsmithing. I believe you are going to be asking a lot for that case to get 2900fps from a 105 class bullet in a gas gun. Here is why i say that, and hopefully what i am about to say will help you along in your endeavor. The 6mmGrinch, 6mm AR Turbo, 6mm Fat Rat are all about the same exact case capacity based off the same Parent case, soooo they all perform very close to each other. No surprise there. About 2011 i built my first 6mm Gasgun chambered in 6mm Fat Rat. I shot it a ton and for a Gas gun was a very accurate rifle with a Satern, 1:7 twist 26" barrel.
I shot it competitively in NRA highpower competition, 200, 300, and 600 yards. At the 600 yard line with the bullets
seated long to get them out of powder column and single loading them not out of the magazine as per the rules. i was able to get them to shoot at right around 2800 fps with a 105gr Berger VLD. ( which is what i run my 6mmBR at) There is huge difference here when you get the bullet seated out of the case vs trying to cram it into the case so that it fits MAGAZINE Length. I wouldn't even bother if i would have to do that. The AR magazine is a huge limiting factor in the case's performance. At the 200 and 300 yard distances i shot lighter and shorter bullets like the 87gr VMax, 95gr SMK and so forth.
Maybe the 2900fps is not important to you, but since you brought that up i thought i should explain what most likely will happen. Your going to end up around 2700fps with a 26" barrel and less if you go to something around 22" barrel. All of that, and you still have to get the gun to cycle! The Gas gun complicates this process so much more than running a bolt gun. Its a bad ass little case that i love dearly. But it has its limitations. Especially when you AR has a Max OAL of 2.250 or there about.
An even more bad ass case is the 224 Grendel shooting 88gr ELD's.... and that is very unique little case as well.
I say all of this so that when you do yours, your not completely disappointed. Take a look at the 6mm Fat Rat or the 6mm Turbo 40. those have already proven in a gas gun. its almost the same case design.
