50 Caliber RRA 12.7mm Ball and Tracer – Reduced Range Ammunition

The 0.50 caliber 12.7mm RRA Ball and Tracer ammunition provide the same ballistic characteristics of full range operational ammunition up to 800m.

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I have a bullet that has S.L. 43 on the bottom of it. Is this equivalent to a .50 cal round? - Quora

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When they say that 50 BMG is 12 mm, do they mean only for the bullet or the whole cartridge? - Quora

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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

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