MM, to follow up on my previous comment, from a 16" AR I loaded up to 3000 fps with 55gr SP bullets and XTerminator, and up to 3180 with 50gr Vmax, with best accuracy at those top loads. I don't have a velocity for the 53 gr but one could make some educated guesses.
The 77gr Nosler load sounds disappointing. I had difficulty getting that one to shoot well too until I tried Benchmark; 23.5gr shot well with an S&B SR primer. Velocity should be ~2650 fps in your rifle. 8208 XBR seems to give pretty much the same results for the same powder charges so either one will work if you have them. ( I have been suspecting they may be the same powder with just lot to lot variations between them).
Last edited by Yondering; 08/16/17.
