Lyman Double Cavity Rifle Cast Bullet Mould casting bullet #257420, .258" nominal diameter, 65 grain, Flat Nose, Gas Check bullet. First designed for Australian jackrabbit shooting. Fine for medium velocity in 25 cal rifles, uses Lyman Top Punch #420, Item #LYM2786728. Approximate Bullet Dimensions: Bullet Length-0.61", Bottom of Crimp Groove to Bullet Nose-0.30", Meplat-0.16".