I have recently gone to .45 Supers out a Kimber Custom II. Depending on how far you want to push things, I went to a 25# mainspring, extra power firing pin spring, flat firing pin stop, and up to 28# recoil spring.
You could mod less with keeping them at about 950 fps. I only changed my FPS, and put in a 22# recoil spring at this level. I had no issues with my gun.
You are working with something different, and I cannot advise you what to do with your gun. Only information about what worked for mine with my handloads.
great information, thanks. I will start with a Brownells chamber reamer and go from there.
