Originally Posted by Tikkamike
I am place Ming a new build and I'm leaning toward a 6mm of some sort. I am thinking 243 AI or 6mm AI. I like the added velocity of the 6mm AI. But the brass offerings of the 243. so I'm asking for opinions on the 2 or even other good short action long range calibers. Its going in a single shot small shank savage action. Its going to be used for deer and antelope. Rocks. Steel p dogs that sort of thing.
So please all input wanted.
the Savage action is a little longer than a Remington, and this makes things easier. I'd go with the 6mmAI without a secound thought. But you might also consider using a 6mmAI reamer, and set the headspace with a .243AI gauge. This gives you the .243 case length but with the better 6mm neck design (you'll still have to use 6mm brass). The 6mmAI barrel will last longer than a .243AI barrel, but most of all the longer neck will help you keep the base of the bullet out of the shoulder area of the case. As it should be. I'd also be thinking about a 1:8 twist barrel for really long range bullets.
The 6AI barrel will have a much longer barrel life than the 6/.284 if that matters. Both rounds are overbore, but the 6/284 is getting excessive. Precision Shooting ran a test a few years back, and found the 6AI was almost a 100FPS faster, and handled the long VLD's better than the .243/.284 case did. Might also want to think about a 6Vias