50 bmg - General Ammunition Discussion - International Ammunition

here are 3 shell I would like to get information on, mainly color code and country.

50 BMG (12x99mm) by NAMMO/MAC LLC, Partial Polymer Case & Polymer

Another oddball .50 cal ammo can use- 7.62mm bullets - General

50 BMG for (big) rats? - General Ammunition Discussion

WTS / WTT: Israeli .50 cal BMG API ammo TZZ mfg

Remington .50 BMG (British Contract) - General Ammunition

700 BMG wildcat - General Ammunition Discussion - International

50 BMG : Informations about the Multipurpose Cartridge - General

50 Cal Experimental - General Ammunition Discussion

Semi-finished product .50 BMG? - General Ammunition Discussion - International Ammunition Association Web Forum

50 BMG Help General Ammunition Discussion International

What would this be 50 BMG shortened and necked down to 30 cal