My DPMS 1:8 will shoot under MOA with 77gr SMK and 75gr OTM/Hornday and PPV.

My VTAC M&P will nearly match it out to 100yrds with no problem. It works "best" with the 68gr Hornady OTM handloads I feed it.

Both work equally well with 55gr XM193.

I stopped buying/shooting 62gr SS109/M855 stuff a while back. None of the ranges I shoot at like to see folks with steel core ammo these days.