Been shooting only 38 special for a good while in my 357. I loaded up some workups for 357 and went to the range earlier this week and found the 357's would not chamber fully in the cylinder about 3/8" sticking out. Figured it was some kind of buildup from the shorter 38 specials. So after getting home, took the cylinder off and ran a bronze bore brush with JB compound driven with a drill. Lots of black sludge. After several treatments, the cartridge finally chambered fully, a nice, easy drop fit. Luckily brought my 44 mag too so wasn't a wasted trip to the range. So a lesson learned. I'll probably be changing to all 357 cases from here on to avoid this problem again and pay more attention to cleaning the cylinder better. Will just load the 357 cases to perhaps 38 special +P levels.