We've been working up a 77 TMK over max published load recently. Haven't matched 5.56 77 velocities yet, but it's shooting well.
With these faster, benchrest rooted powders, I try no to get to exact velocity match because I've had blown primers with powder lot changes. I'm just more comfortable with about a 75 fps +/- cushion.
I could check where we left off on our TMK load for Velocity and charge weight if you want.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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