US Projectile, 3 inch HE, M42
The projectile is of 1 piece steel construction and has the same length and contour as the Mk IX combined with its adapter. The nose is threaded to receive the M20 Booster. The radius of ogive, rotating band, and base plate are also identical to that of the Mk IX HE Shell. The filler is 0.86 pound of TNT.