I have a few parts on hand and decided I would like to build a magnum rifle. It must feed and work with AICS magazines / Remington long action. I have narrowed it down to. 7mm Rem Mag (162gr-180gr) .300 Win Mag (190gr-210gr) Chances are this rifle will see 99% of it's barrel life shooting steel targets and both are capable of taking any game I would consider hunting with the rifle at the ranges I would shoot so thats not really an issue. So what would you go with? Any others out there I should consider? for people that have shot both what did you prefer?