I bought a new .270 two years ago. A Browning A-Bolt. My choices of ammo are pretty limited as I live pretty far from a consistant source. But the Remington Core-lokt' s are readily available here.

So....The only rounds I have ever fired through it are 150 grain Core-lokts.

I think that the biggest factor is to be consistant in what you shoot. If you shoot alot...Always shoot the same stuff...That coupled with good shot placement will make you a winner.

Good luck and congrats on the new weapon.