i got the xtp.452 300 mags and after i got them wondered if i should have got the non mag ones.....if i understood it right the mag bullets are made for faster fps or more power....i was shooting them with 150grans of prodex(3 pellets) thats why i got the mag bullets......now i'm useing them in my white mountian with 80 grans of loose prodex rs...and maybe its not fast enough to get a mag bullet to expand as good as a reg 300xtp...but the mag bullet are different than a reg there stronger built for mag charges......ed