While I doubt it would hurt I also doubt it would help. If it was a tight throat on that chamber it might as the chamber reamer would take the throat to .222 I would suspect something else. A stop notch that was off a bit maybe or a just slightly off chamber. If you reamed a slightly of chamber it would remain in exactly the same spot just be perfectly round and a very tiny bit bigger if at all undersized.
You know which chamber it is, so line that one up with barrel and see it the stop notch that is locked up has more slack than the rest. If you have a cleaning rod, piece of brass or the like that just fits down the bore to function as a range rod you can see if it hangs up on the edge of the chamber, but as the lands are smaller than the chamber it is not a perfect check for alignment. Be 100% POSITIVE CYLINDER IS EMPTY then cock the gun and from the side shine real bright light at the B/C gap and look down the bore and look at the shadows, look down the bore with the light. I don't know how much you can see with a 22. but with bigger bores you can see if a chamber is off very much. More gap gives more light. I bought a small camera I can hook to my phone and slide down a barrel, but not a 22 barrel as the lens piece is 6mm.
Another thought I have had is to turn a piece of brass to just fit the chamber with a small hole dead center in it. In the case of a 22 a 1/ 8" hole would work. You could even use a fired piece of brass in a 22 to "shim" out the chamber to see if your range rod drug on the inside of case. With the dummy piece I was speaking of you could make up and run a range rod that just fit the lands down the bore and it it has a short 1/8" tip on it that rip would not enter the 1/8" hole in center your test blank if chamber was misaligned. I have made brass test that just fit 45 , 44, 357 and 32 barrels, but have never made on for a 22. Mine have a hole in one end threaded at 1/4 20. If I screw in piece of a 1/4 20 bolt that I cut the head off and turned to a point it tells me if the barrel is dead straight in line with the firing pin hole on a center fire.
I spend entirely to much time messing with revolvers
You know which chamber it is, so line that one up with barrel and see it the stop notch that is locked up has more slack than the rest. If you have a cleaning rod, piece of brass or the like that just fits down the bore to function as a range rod you can see if it hangs up on the edge of the chamber, but as the lands are smaller than the chamber it is not a perfect check for alignment. Be 100% POSITIVE CYLINDER IS EMPTY then cock the gun and from the side shine real bright light at the B/C gap and look down the bore and look at the shadows, look down the bore with the light. I don't know how much you can see with a 22. but with bigger bores you can see if a chamber is off very much. More gap gives more light. I bought a small camera I can hook to my phone and slide down a barrel, but not a 22 barrel as the lens piece is 6mm.
Another thought I have had is to turn a piece of brass to just fit the chamber with a small hole dead center in it. In the case of a 22 a 1/ 8" hole would work. You could even use a fired piece of brass in a 22 to "shim" out the chamber to see if your range rod drug on the inside of case. With the dummy piece I was speaking of you could make up and run a range rod that just fit the lands down the bore and it it has a short 1/8" tip on it that rip would not enter the 1/8" hole in center your test blank if chamber was misaligned. I have made brass test that just fit 45 , 44, 357 and 32 barrels, but have never made on for a 22. Mine have a hole in one end threaded at 1/4 20. If I screw in piece of a 1/4 20 bolt that I cut the head off and turned to a point it tells me if the barrel is dead straight in line with the firing pin hole on a center fire.
I spend entirely to much time messing with revolvers
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