Be sure the M 70 has a long enough mag well. About 3.6" minimum unless you are going to single load. I think 3000 fps is possible with 28" of barrel, probably with RL 22 or 7828. Fed 215M primers will bump the velocity a little also. Ease up to it though, that's a tough neighborhood.
+1 on the factory std chamber with freebore. The .340 is a surprisingly efficient cartridge, and will get hot quickly if you crowd the bullet too much.
Good choice, great cartridge. Hope it works out. Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time
Last edited by specweldtom; 08-22-2008 at 03:48 PM.