This is a copy of the old Ideal bullet mould 403168 with the addition of a crimp groove. The new 1876 Model Uberti use a .410" bullet. You can use .406" diameter if you are loading with black powder and casting the bullet out of soft lead, say 20-1 alloy or softer. Bullet OAL .707", distance from crimp groove to nose .365", .225" diameter meplat and two grease gooves.