Jim Taylor
Down below I mentioned .22LR and .22WMR
Friday, December 18, 2020, 10:34

and using a fired .22 Magnum cartridge to shoot the .22 Long Rifle in the Magnum chamber. I had not done this in years so I went out to the shop and experimented after I wrote that.

My sixgun .. has one .22 Magnum chamber that my Dad rechambered years ago.

I fired a Federal HP .22 Long Rifle in the Magnum chamber to start things. I should have known, Dad chambered this to a very tight Magnum chamber. The LR did not split but became a reverse bottleneck.

I fired a .22 Magnum in the Mag chamber, then removed the rim and found it to be a very tight press fit for the .22 Long Rifle. When I did it years ago it was in a rifle I had built and chambered for .22 Magnum and it is possible ... very likely .. that the chamber was large. I did not remember it being a tight fit like this. Perhaps I should have seated the LR into the mouth of the Magnum cartridge? Maybe the walls are thinner there? More testing will be required.

I shot it into a 2x4 and then recovered the bullet.

It will work. It may not be a hand-fit. Depends on your gun.