The buckshot from a 40mm probably wouldn't have almost any penetration beyond a few meters. Those grenades are extremely low velocity. You can watch the projectile fly thru the air when you fire one. The .22 would most likely have better penetration against basically everything.
Not saying that the round would be particularly useful. It would depend greatly on how common body armor is among your opponents. Against unarmored people, at fairly close range, it'd be a nasty round to get hit by, especially if the barrels were positioned so that all the rounds were hitting in an area not much bigger than the casing.
|