If they are from a company in Alaska, I have one in .22 LR for my .222 Contender barrel. Had some problem with head spacing using the insert and had to use it on my G2 frame as it's more convenient with the switch on the hammer then turning the screw on the original contender frame.

One issue I had is that the .22 LR did not shoot to point of aim with the scope that was sighted for the .222 round. Guess that's to be expected but it was more off than what I hoped it would be.

All that said, if you do some YouTube research, there are plenty of folks using them that have had no issue and like them. My plan was much like yours, use the .222 for fall turkey but have the insert handy should a squirrel pop up. Don't think I'd feel comfortable doing it after trying it out.

John