You could be wrong but I really don't think you are. God Bless them, they called Friday night during happy hour, so I had to cut my happy time and grab the gun. We will see how she shoots today.
PB
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Yes, all great selections. I'd only point out that BLC-2 will get you faster velocities while nearly filling the case on 77gr projectiles. Very close to AR-Comp which is slightly less popular. BLC-2 probably isn't as temp stable as say I/H 4895 which is a few spots slower.
Obviously seating depth matters.
I4895 just edges it out when you get to 80gr projectiles, both closely followed by CFE223.
I too have had great sucess with XBR, but they're all over 2600 FPS at or near max pressure.
We did realize velocity gains 70-85 fps compared to the 20" bolt gun. But I plan to try hot loads with slower powder still.
Also it seems the 80 gr Nosler CC hits the lands at 2.470". The jump for a 77 gr SMK is .090" from 2.250"
Now I know people will say "I shot thousands of rounds of ball and I don't have any problems". But I've read this and heard this from multiple reliable sources.
How severe the issue is may be debatable, but we pissed off the Geissele barrel by going back and forth with several extruded and ball powders.