Buffalo Bore Barnes 45-70 Government 350gr TSX-FN Rifle Ammo - 20 Rounds - This is a super powerful 45-70 +P (or magnum) loading. It is externally identical to SAAMI spec. 45-70 ammo, but internally it generates FAR more power and pressure. This 45-70 ammo will fit/chamber into any 45-70 firearm; HOWEVER, its use should be limited to firearms that are built to take the +P pressures it generates. This all copper expanding 350gr. TSX-FN bullet will penetrate about as deep as the typical premium 400gr. + lead core partition expanding bullet, yet it gives the benefits of a lighter bullet, which means it recoils less and has flatter trajectories.