The 300 Rem. Ultra Mag., will give you the same velocity with less powder.. But, to be honest, in less I was specifically going to shoot Berger 240gr 30cal. bullets or similar, I wouldn't get that large of a 30cal.... If you want something big although, go up to a .338 type cartridge and I think you maybe more happy. Oh, have a muzzle brake on all these mentioned! Check out Darrel Hollands Radial Brake, it would be hard to beat if you buy the over sized model..