The ogive on the 135 grain GDs has a profile that puts near-full bullet diameter very near the nose, and are loaded pretty long. The .357 Short Barrel loads, and even the 158gr. Gold Dot .357s, come out of the cylinders of some of my K-frames showing a slight mark where they contact the chamber throats, though I haven't noticed this happening with my .38s, and I have some of them in some of my Colt D-frames. The 125s are shorter. Chances are, vigorous cleaning of your chambers with a bronze brush would allow them to seat, but you may just have short, tight throats in your Colt. If so, short of applying a chamber reamer or running the loaded rounds through a seater die and shortening them a tiny bit (not recommending, just sayin'), you may have already found the only solution. Too bad; the 135s run faster than the 125s do.
