Hi Tim, welcome aboard.
Sounds like it could be a nice gun, and as you mentioned, 20 gauges don't come up all that often here.
2 1/2" Kent gamebore shells are available. If you can't find them in stock, pretty much anyone who handles Kent can order them for you if they want to make the effort.
I'd just pay the mailing cost and send the gun to Newf depending on what you want done and if he will take it on. I can vouch for his work more than once. In fact he's getting another gun of mine next week.
However Tim, I will say this. Sometimes in Canada it is difficult to find one person who will/can repair everything that a vintage gun may need, at least to be done properly. So sending it to more than one person may be required at times which is something that you have to anticipate when working on these vintage guns in this country. Not saying your gun is not repairable by one person as it doesn't sound that drastic. Just a heads up when venturing into the vintage gun arena if you plan on having work done.
Last edited by gunsaholic; 01/17/16 10:07 AM.