Buffalo Arms Company Double Cavity Cast Bullet Mould producing a .459" nominal diameter, 300 grain, Flat Nose bullet, with a crimp groove. This mould is copied after the old Ideal mould 456191, now Lyman mould 457191, except that this has a crimp groove so you can load these with smokeless or black powder. Perfect for your 45-60 or 45-90 Winchester and other calibers. Length of bullet is .766", length from the crimp groove to nose is .375" and a meplate diameter of .290".