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Old 03-16-2011, 12:36 PM
new2mud new2mud is offline
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Originally Posted by ctrmass View Post
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.

I'm not sure what you'd lose with a tube 4-6" shorter, but it cant be much.
For the 77-grain bullets, max load (i.e. fastest) is often not the most accurate. The load listed above is a max load ONLY to be used in 5.56, Wylde, Noveske or other higher-pressure chambers, NOT to be used in a .223 chamber.

Even with a higher-pressure chamber, start lower and WORK up to a given load--never take a max published load and assume it is safe for YOUR barrel.
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