Most posts to those 3 comms fail, but sometimes that’s lemmy errors. Anyway.
Rough Rider .22 revolver. Shells on the right are spent, left are unfired. Cylinder won’t rotate after the 3rd shot because the shells deform and poke up. Hell is that? It’s like they fire, bounce back and crumple, which doesn’t seem physically possible.
Sure seems like that’s happening when shooting it. Tested 5 cylinders, .22 and .22WMR, all the same results. Scarily, I can feel some back blast from the more powerful .22WMR, which again shouldn’t be possible.
Took it apart for some deep cleaning the other night, didn’t see anything weird, put it back together. Still fails. And this is the 3rd such gun I’ve owned, not my first rodeo.
I agree with the comments on this forum (https://www.thehighroad.org/index.php?threads/mushrooming-22-lr-case-heritage-rough-rider.891807/) that the cylinder could have a machining defect. (Basically a headspace issue, also but kinda not. The cartridges are sitting too deep in the cylinder itself.)
If there is room for the brass to get pushed back far enough for it to mushroom out, something is seriously wrong. The issue could manifest from a machining error as small as 5-10 thou, I am speculating.
My first thought was excessive chamber pressure, but the bulging would be much worse around and behind the rim itself if that were the case.
The bullet and the brass get pushed in opposite directions and if the brass can move, it will move before it deforms. If it deforms, it’ll deform at the weakest spot first, like we see in your pic. (Excessive chamber pressure tends to expand the brass and lock it in place. With center-fire, it’ll blow the primers out or have a hole punched in them from the firing pin first. With rim fire, the pressure pushes back on the rim.)
Also, check for excessive slop with the cylinder. If it can move forwards and backwards too much, that could also telling of issues with other parts of the gun. (Like I mentioned before, it doesn’t take much for a gun to be out of spec enough to cause issues with brass.)
Seconding this one. Looking at the furthest from camera case, my money it that there is play in the cylinder along the axis of the cylinder pin. That case being swollen, just above the rim means one thing, that the case has enough room to move back out of the cylinder while firing to allow that to happen. Overpressure i.e. hot loads may be contributing to an issue you wouldn’t observe with lighter loads. Have you played around using different ammo?
Got me in the zone! Testing today and the cylinder pin wasn’t seating tight. Tried to tighten the release button, already tight, seemed good for a minute.
Fired 6 rounds, but it got sticky. Same issue, but not as bad. Too tired to mess with it more tonight, but the cylinder is indeed moving forward on the cylinder pin axis.
You are now my rubber duck.
All ammo, all cylinders. Taking it out in a bit and holding the cylinder tight against the gun when I fire. Bet money that works, not sure where to go from there.
This was my initial thinking as well. Could also be something loose in the cylinder connection that is allowing it to move and shift around side to side just enough to allow the brass to deform.
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