I have three P-14's built up into rifles. One is a .300 Win. Mag., one is a .338-.378, and one is a .510-.505 Gibbs. The actions seem to be sufficiently strong and stiff. The .300 Win. Mag has a 1.25" dia. untapered barrel that is free floated from about an inch in front of the recoil lug, and it is a sub-1/2 MOA rifle that threatens to shoot 1/4 MOA (couple groups that small). I can't get better than 1.25 MOA out of the hunting weight barrel (free-floated from an inch forward of the recoil lug) on the .338-.378. I guess I've just got to try a lot harder. The .510-.505 Gibbs is early in development, and shooting 700gr. M2 ball through a turned-down 32" long 1.375" dia. M2 .50 BMG (also free-floated from the recoil lug forward) barrel, it looks like it may shoot 3/4 MOA. All of these rifles are single shots because either the ammuniton is too long or I'm too lazy to open up the rails. I would caution you to watch the throat length on your reamers, or the ammunition won't have bullets close to the rifling and fit in the magazine, and your bullet choices will be limited to the heavier, longer bullets. Anybody know where to get P14 actions cheap?