I have a qty of 400gn Lyman #457643 Powder Coated Flat Point bullets. Designed for the 45-70 Govt I believe but I don't happen to own that calibre. I do have a Rossi 92 Puma in .454 Casull. While my research indicates the optimum bullet weight for the Casull is around 325gn, Hogdon load data goes to 395gn. The Lyman #457643 I have mic at average of .460in dia. I have a .452in Lee sizing die. I suspect a bullet at .453 or .454 will be fine in the Puma and also that .452 will be a big ask to resize the .460s down to in one pass. This is new territory for me so input welcome. I'm a bit nervous about loading them at .460in with possible pressure increases.
Of course I could just trade them off for something closer in dia to what I think I need. But if it is reasonably feasible to size them down I can get a Lee Sizing die at .454 as either a shootable dia or an intermediary step.
How practical is it to do this? Issues?
thanks in advance
John - New Zealand