I cast my own 45 Colt bullets and size them down to .452. I have fired these reloads thru Rugers and Colts only. My reloads do not exceed 900 FPS and are accurate.
I have also fired .454 HDY cast factory bullets thru Rugers in the past w/o any problems.
Today, I only use my own cast .452 bullets & Starline brass in 45 Colt because they give superior results.
After reading your post I checked my HDY#7 manual and it lists loads for both .452 & .454 bullets in 45Colt (P907-910). I am not familiar with your pistol. My advice would be to use the .452. If you have accuracy problems or other concerns, I would slug your bore.
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