.50 BMG (12.7x99mm) Lake City Can Label API MK211, AP MK263, API Dim Tacer MK257. 2008

Interesting ammo can (empty) label. I assume that by using the DIM Trace API MK257 this was for night time - night vision equipment use.

So it appears the belt loading was: 1 API MK211, 1 AP MK263, 1 API MK211, 1 AP MK263, 1 API DIM Tracer MK257

Any comments most welcomed.

Brian

Brian, nice box! This is a relatively recent configuration that replaced the API Mk 211 + AP M2 + API Mk 211 + AP M2 + API-T M20 configuration and, as you say, it was meant to be used with night vision equipment. The Mk 211 variant found in these boxes is not the Mod. 0 for sniper use, but the Mod. 1 made to looser standards (machine gun use).

Here is a nice picture of .50 Cal. machine gun with night vision optics:

Regards,

Fede

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Nice box. A little weird (to me) that the Mk 211 is designated API, considering it’s really APHEI (or MP).

Ole

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Ole,

It seems the official description/designation is “BULLET: 43.5 g (671 gr) FMJ (Copper) Boat-Tail with Hardened Steel Core, Incendiary and Energetic Composition”.
Energetic composition- A nice way(?) of saying HE.

0.50 BMG API MK211 LC (ATK) Fact Sheet 2015.pdf (84.9 KB)

Brian

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Thanks for the data sheet!
Indeed, “energetic composition” is a very PG-13 way of saying PETN…
In Norwegian service the NM140 and NM160 are designated in fact as MP and MP-T on ammo boxes and in instructional literature, so the API/API-T designations used abroad seem a little more “innocent” :-)

Ole

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Comp A, not PETN. Original NM140 was PETN, but US didn’t want that compound. Not as stable as Comp A. The change resulted in the Mk211 (in US service) and NM140A1 (Nammo designation).

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Right you are.

Here is a document from the Norwegian armed forces’ research institute on the dangers of undetonated Mk 211 projectiles, heated up by campfires, grills, or other means in popular trekking areas (how very Norwegian):
http://rapporter.ffi.no/rapporter/2009/01429.pdf

Ole

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thanks !


tennsats

    July 8

50m2hb:
Comp A

Right you are.

Here is a document from the Norwegian armed forces’ research institute on the dangers of undetonated Mk 211 projectiles, heated up by campfires, grills, or other means in popular trekking areas (how very Norwegian):

http://rapporter.ffi.no/rapporter/2009/01429.pdf

Ole


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