It should be noted that Elmer Keith designed the 429421 in the 1930's and when reading this thread it is obvious that it is still considered the best boolit for .44's ever made. There are several close variations of the mould, H&G 503, RCBS 44-250KT, my personal mould is a Mihec mould with interchangeable HP and Solid Pins.
Hard to go wrong with that one.
Randy