Sources seem to disagree as to the size of the buckshot used in the M576 (XM576E1) and XM576E2 shotshell rounds for 40x46mm grenade launchers. I’ve seen it listed as #4 Buck and as 00 Buck. Which is it?
I may not be of real help but here is what
NAVSEA SW010-AD-GTP-010 SMALL ARMS AND SPECIAL
WARFARE AMMUNITION, 18 May 2004
is saying about:
5-2.6. Cartridge, 40 Millimeter, Multiple
Projectile, M576 (B534).
5-2.6.2. Description. The cartridge is 2.5
inches (6.35 centimeters) long and weighs approximately
1,882.46 grains (122 grams). It is a fixed
round of ammunition consisting of an MP assembly
and a cartridge case assembly. The projectile
contains a polyethylene sabot carrier with a center
cavity that contains a plastic pellet cup[color=red] filled with
twenty 20-grain (1.30-gram) lead pellets [/color]and covered
by a snap-on cap. The cartridge case contains
a 2.87 grain (186 milligram), M2 propellant charge
and a .45 caliber percussion primer. It is green
with white stenciled identification markings.
Thank you. 20 grains is the approximate weight for a #4 Buck lead pellet.