Thread: Ultimate compact rifle & catrige - 6mmGT/22GT in howa mini action

Originally Posted by Tentman

You need to get to grips with how bolt thrust works, there is a reason the mini action is smaller than a std 1500 ,. . . I also think the 6 GT would be a great cartridge for NZ, I currently run a 6.8 SPC (pretty much the same as the 6.5 Grendal) and something with a bit more snot but without the barrel burning habits of the 243 and 6 CM would be nice. I doubt you'll fine a gunsmith brave enough to do it in any of the mini actions, and if you do you'll find yourself in mag feeding hell, there is a big difference between the x39 based cartridges and the ex 308 ones.

I am not sure the bolt thrust has much to do here. F(bolt)=P(max)xA(internal or external), so long the pressure is same and the case head is same then the bolt thrust is the same. So really it is the pressure we are talking about here. the 5.56 (nato version if 223) has sammi pressure of 62366 psi, and your 6.8 is not far behind. Both are used in AR, a platform known weaker than a bolt action. the mini certainly will be weaker than a standard action but by how much is anyone's guess. Again you have very good point there. As for magazine, if it can deal with 450 bushmaster then it should work on GT. I have a 3d printed mini magazine so it is not end of the world if the factory one doesn't work.