The Real Deal
Here is the US Military Tech Manual on small arms ammunition specs. You will also need CCI#41 mil-spec primers, and WC844 (AKA H335) military surplus powder (available at Wideners.com (sometimes) and GIBrass.com (AKA Bartelett Reloaders).
See page 154:
"Propellant:
Type ...............................WC 844 or
CMR 170
Weight .............................28.5 or 26.5 gr
Projectile:
Weight .............................56 gr
Performance:
Chamber pressure...............52,000 psi
Velocity ..............................3250 fps, 15 ft from"
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