Perhaps this should be in the gunsmithing forum but I'm already here...

I've always read that it's patently unsafe to rechamber a .22LR to .22WMR due to the higher pressure of the WMR AND the smaller bore diameter of the LR. The combination being just too much.

I recently read a post on another forum from a suposedly reputable gunsmith stating he's done it "many times."
Now to qualify that, I've seen quite a few very strong .22LR actions and after all, the hornet was first developed on the old Springfield trainer action. That said no mention was made of specific actions used and he seemd to imply that it was safe for any LR action.

Personally I'd never do it or reccomend it but I'm curious what you guys think. Along the same lines there was mention in a post on this page about the .22LR/.22WMR combo revolvers. Something I've also wondered about often. Are they .223 or .224? Perhaps the smaller bore to fit the LR and any excess pressure vented via the cylinder gap???