The 0.50 caliber 12.7mm RRA Ball and Tracer ammunition provide the same ballistic characteristics of full range operational ammunition up to 800m.
Ben and Bawb's Blog
Firearm
50 BMG bullet ID help - General Ammunition Discussion - International Ammunition Association Web Forum
MCWP 3-15.1: Machine Guns and Gunnery - História
Products Archive - Venus Packaging
International Ammunition Association Journal Index
Medium Caliber Ammunition - General Dynamics Ordnance and Tactical Systems
What type of bullet has a base of about 3/8 of an inch? I found a few ones like that metal detecting and they look pretty big to be a regular hunting
When they say that 50 BMG is 12 mm, do they mean only for the bullet or the whole cartridge? - Quora
Ben and Bawb's Blog
T-34-85 Soviet Medium Tank - Real History Online
International Ammunition Association Journal Index
Mil PRF 46103e, PDF, Density