Lyman Single Cavity Cast Bullet Mould casting a .58 Caliber, 405 Grain Hollow Base Minie bullet, Lyman bullet #578657. Lyman calls this their Blue-Grey Target bullet. Newly designed target bullet popular for North-South Skirmish target matches. Approximate Bullet Dimensions: Bullet Length-.964", Bottom of Crimp Groove to Bullet Nose-.472".