I have a fine K-22 pre-17, 1948 version, 6". A real target pistol. Any .22LR I try in it shoots pretty much to the same POA, from cheap, slow and dirty, to expensive and fast.

Today at the range I had a problem. I hadn't fired it since about two weeks (three range visits) after I took possession in 2021, after buying it from a member on the Ruger Forum.

Squeaky clean, tried Federal HV Match, some Armscor High Velocity, and a few CCI Mini-mags. 100% hits on an 8" plate at 15 yards, 6/12 at 30 yards. After about 24 rounds, the cylinder started hanging, both in SA and DA. It would not cock, seemingly locked up.

It felt like the cylinder was not setting in the notch on the two chambers opposite the serial number on the cylinder, but dry firing at home proved that was not the case. I could wiggle the cylinder and get it to cycle, and finish each cylinder.

The cylinder tolerance is tight - tiny front and rear gap, barely any play in the lockup, no endshake or movement. No dirt under the extractor, good solid firing pin hit, smooth cartridge insertion and ejection.

What am I seeing here? Worn hand or worn cylinder stop? I know S&W won't work on a 76 year old revolver, but the "best local gunsmith" is not as good as I hoped. I'm mechanical enough to know what I'm doing for simple gun stuff. Suggestions?

__________________
Heavily armed old man.