I agree with jumpalot... I just finished a 300wm and have been testing loads all week ... 28" #4 flutted-pacnor ...(w/brake of coarse)both rl22 and h1000 have easily got the 215's 2950 to 3050fps .. deffinate pressure around the 30505 mark... the 215 is a game changer for the 300wm