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Old 03-15-2011, 1:53 PM
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ctrmass ctrmass is offline
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I havent read all 5 pages, but AA 2520 is a pretty good powder for the 77's.
Accurates site has them going 2900 + FPS out of a 24" bbl.

bullet start FPS max FPS psi OAL
"2520 77 SIE HPBT 23.0 2,674 25.5 2,925 62,200 2.260"
This a "nato pressure" load. It dont say but I'd assume a 5.56 chamber.

From their site.
http://www.accuratepowder.com/wp-con...d_data_3.5.pdf

I'm not sure what you'd lose with a tube 4-6" shorter, but it cant be much.
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