Some where I remeber seeing achamber insert for .22 cal centerfire rifle cartridges to shoot .22 cal rimfire.

Was I dreaming or did anybody else see something like this?

The one thing I can't quite get around is the firing pin hitting the rim which makes me wonder if what I was thinking of was a pipe dream.

They made them.

.22 Round fits up into the adaptor and a metal plug goes in behind it...that plug carries a rim fire pin on one end of it, the other end is struck by the centerfire's firing pin.

Will look...been a few years, and i've also forgotten the maker...dont know if they are in current production.
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http://www.mcace.com/adapters.htm

Thanks.

Golly I love this place.

Try www.mcace.com (http://www.mcace.com) They make inserts for rifle and Shotguns both.