SAECO Single Cavity Cast Bullet Mould for a .378" nominal diameter, 300 grain, Round Nose, Flat Point, Tapered bullet. Tapered styled bullets have the front band near bore diameter tapering to slightly larger than groove diameter. This style bullet was furnished by most of the old time barrel makers such as Harry Pope. Good 38-55 Winchester caliber bullet. Use SAECO Top Punch #SAE37570.