Re: .451 or .452 ?
Actually, the sized diameter for cast bullets from commercial bullet manufacturers varies. Some manufacturers size to 0.452", while others size to other fixed diameters. So that all possible bore diameters can be accounted for, we size to the customers' requirements:.451", .452", .453", and .454". The reloader can then determine which diameter they require and receive the correct bullet diameter.
Dardas Cast Bullets