iambrb,
you should get soild 3800 fps with the 60 grain bullets.I get 3600 fsp with hornaday amax 75 grn bullets, i am testing 70 grn barnes TXS so far I am at 47 grns reloader 22 with an average mv of 3700. I have began to experiment with rx25 jury is still out on this powder. speed isn't a problem with this round but finding a bullet that will not spin apart in flight is the true problem with this round. Excluding triple shocks.
