I had a remington 700 sps, it was sadly a piece of crap, the chamber was of center I was told it was within the manufacturers specs I converted some 223 case to saami specs they would not chamber when some remington ammo came available it would not chamber either, the next batch of ammo that came out was shorter and it chambered, in short the rifle and remington service are crap.

I do know people that have the 300 in a Ruger and they are happy, I bought a 7.62 x39 ( 308 barrel) and load my own there is hardly any performance difference between the two.