So today I was warming up for an upcoming match using my 686. Shooting .38 spl and after firing maybe 40 rounds I decided to do some quick target transitions and reloading practice. My loadout was 24 rounds to start. I went through all 24 without issue until it was time to push the cylinder back in and reholster. It would not go in, no way. My middle age eyes did allow a close up view but it appeared there was zero cylinder gap which was preventing me from closing.
My first thought was it's hot here and 24 rounds in succession maybe heat expansion? I can't inspect it now, I'll have to wait later today or tomorrow.