Lyman Double Cavity Cast Bullet Mould producing Lyman bullet #311672, a .311" nominal diameter, 160 grain, Round Nose, Gas Check bullet. A good gas checked bullet popular with black powder cartridge rifle (BPCR) silhouette competition shooters. Lyman Top punch #644, item #2786758. Approximate Bullet Dimensions: Bullet Length-0.95", Bullet Nose Length-0.63".