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A military small & medium caliber ammunition collection

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20 x 110mm HS United States

20 x 110mm HS TP M99 United States 20MM M21A1 NESCO 1953 (black ink) ELEC ELEC profile view.20 x 110mm HS TP M99 United States 20MM M21A1 NESCO 1953 (black ink) ELEC ELEC head view.

Details

TypeTP, M99
Projectilesteel, aluminum windscreen, black, 1 copper driving band Projectile Markings: (white ink) 20G TP M99 K.O.P. 99-229 Driving Band Markings: NL-3-25-53-20MM-M99
Casebrass, knurled choke crimp
Primerelectric, flat, brass, ring crimp, red annulus
Headstamp20MM M21A1 NESCO 1953 (black ink) ELEC ELEC