I pulled a jug out of my cabinet and have been working on some 55 FMJ rounds. I settled on 26.5 and they have been running great in both my 16 inch uppers. I will crono some this weekend and see what we get. Its running good through my Dillon & I have cranked out a little over 400rds. I have not really tried for accuracy other than hitting a 10 inch plate @ 100yrds off hand at my club. Like I say I'll Crono some this weekend and let ya know,plus I will sit down and see what I get @ 50 & 100yrds for accuracy.