Having done quite a few 45 colt conversions, I believe reaming an ACP cylinder deeper is the very worst way to do it. I have never tried the 45 colt clips, which would have to be pretty thin. I am a firm believe in either have multiple guns or a 45 colt cylinder cut for moon clips.

There is on relatively cheap and easy way to go, that I did to a 325. Fit a 45 colt extractor to your ACP cylinder, ream it to 45 colt depth and then thin the ends or each arm flush with ACP cylinder. Then 45 colts will headspace properly on inner part of extractor and 45 acps will work in old style 1/2 moon clips

45 colts

3 acp in 1/2 moon and a coupe 45 colts all in same cylinder