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Old February 1, 2011, 06:42 AM   #9
P-990
Senior Member
 
Join Date: May 2, 2002
Location: Only1/2WayThere
Posts: 1,065
You want 2900-fps with a 75-77 in a 20" .223? Remind me not to shoot next to you!

Seriously, you can drive a 77gr Nosler/Sierra to about 2750-fps reliably with a 20" 1-8" twist barrel. The 80gr bullets can be driven to about the same speed but require adjusting seating depth and bullet jump.

As for sacrificing speed, I have it from a reliable source the Army Marksmanship Unit uses an 80gr .223 load at 600-yards that runs slower than what most of us civilians shoot. They seem to do alright with it...
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