[swaghauler]

Originally Posted by Legbreaker

A couple of useful links.
https://www.globalsecurity.org/milit...tions/m576.htm
http://inetres.com/gp/military/infan...40mm_ammo.html

Also worth noting the wealth of adaptors/sleeves available allowing use of full sized 12 gauge ammo (and others) which mitigate the high pressure problem.

Attachment 4128

Thanks for the links Leg but they use the older outdated information. I really haven't found a source that can confirm the existence of the 00 Loading (if one exists). The M576 contains plate #4 Buckshot because you CANNOT fit 20 00 pellets into a 12 gauge hull (15 to 18 will fit into a 12 Gauge 3.5" Magnum hull) and only 18 will fit into a 10 Gauge hull. I think I would use one of those cool "inserts" designed to fire 12 Gauge Shells in my 40mm (given the choice). They are also available for Flare Guns/Launchers and are well-proven technology.