Hey Rodsmith, I' ve used the 444SS for several years now and I' ll never get rid of it. I' ve read that some 300 grain bullets won' t stabilize in a Micro Groove barrel causing a keyhole on a paper target, but I have used Hornady XTP' s with no ill effect at all. Until this year I used 240 gr. bullets for deer but now I' m trying the Hornady 265 gr. Twelve deer and counting with this rifle, never had one go more than a few yards after a hit, most just rolled.