M855 Projectiles

bperdue21

I bought 100 of these on auction just to try them out. Does anyone know what the military velocity on these should be? I'd like to get it as close to factory as possible. Thanks.

sandwarrior

3100, (+ or -) That's from a 20" barrel. 2900 from a 16" barrel.

Edit:

laylandad,

We're pretty close, but this is one source I got my information from. Excerpt from an article in Infantry Magazine in 2004

Velocity (ft/sec)--20.0" barrel Range (meters)
Cartridge / Bullet 0 100 300 500 800 1000

5.56x45mm 62gr 3100 2731 2076 1529 1032 895
5.56x45mm 77gr 2750 2481 1989 1564 1117 971
6x45mm 87gr 2650 2396 1931 1530 1110 971
6x41mm 90gr 2600 2375 1958 1591 1177 1022
6.8x43mm 115gr 2700 2417 1903 1470 1055 929
6.5x38mm 108gr 2700 2497 2117 1774 1345 1142
6.5x38mm 123gr 2600 2426 2098 1797 1410 1211
7.62x51mm 147gr 2700 2473 2051 1676 1238 1063



Edit II:

bperdue21,

I just had an epiphany. If you don't have a 5.56mm NATO chamber (different from .223), you shouldn't try to duplicate that velocity. Work up until you see pressure signs.

bperdue21

Any idea what powder they use?

laylandad

I believe the correct velocity in a 20" barrel should be somewhere around 3025 fps, with some data claiming 3000 fps +/- 40 fps. I don't have any info on the shorter barrels, but it would be a little slower.

Delta Elite 10MM

H335 is the powder that is closest to what your looking for.

dcs shooters

+1 on the H-335.

bperdue21

It is for my bushmaster. It is 5.56. Thanks for your help guys.