Testing, testing...

[stanc]

Slugs from rifled shotgun barrels, however, can get closer to 1 moa.

Further, we're talking about a bursting round with an effects radius of at least 2-3 meters -- the effective target then becomes a tad larger than the standard silhouette.

And yet the 20mm warhead for the XM29 OICW has considerably more explosive compound and fragmentation ability than the tiny 12ga HE projectile, but was deemed inadequate in casualty radius and superseded by a 25mm round.