Patrick,
I did a 20g to 28g sleeve conversion on a LC Smith. Kirk Merrington mentored me. I believe he's your man. I think he's done more than one of these. He's in Texas.

I think you'll find that you'll need a bit of space between the muzzles when regulating. This is because of the wider spacing of larger gauges at the breach.

Last edited by Chuck H; 02/16/10 04:29 PM.