Jeff, I was interested in your post regarding older doubles. Over the years I have had many, and shot all with steel shot. No problem after taking the tight chokes out. Without question, my favorite guns are based around old 10 bores. While not cheap, they can be made into wonderful waterfowling guns. I have taken old 10s, sent them down to Briley's and had them re-barreled and chambered into 3 inch 12. The cost involved is $2000.00. I now have five old 10s reworked. Two are W&C Scott backaction sidelocks. One of these is the Premier Grade. That was truely a remarkable find. In the early 1880s the Premier cost more than any other English gun, even a Purdey. Over the years I have only seen two or three of these Premiers up for sale, and all were priced at over $5000.00. A couple of years back one came up for sale on a local internet auction. It was a 10 bore, barrels worthless, checkering totally gone, and a broken firing pin. However, the engraving was excellent. My guess is that the owner just thought it was a wall hanger. I put in an opening bid of $300. On the final day another person bid $325. I bid $335, and was glued to the computer the finally minutes waiting to be out bid. I wasn't. I put another $2400 into the new barrels and checkering and firing pin. The outcome was a gun as good as any ever made. I had the chokes done mod/mod and use it most frequently for snow geese in Sask. with 3 inch loads.
I also have a Charles Boswell 10 bore that Briley did for me. And last year picked up two more old 10s. One was a remarkable deal. I paid $1100 for it from a dealer. It is a New Ithaca Double (1927) 2 7/8 inch 10 bore. I had Briley just chamber that into a 3 inch 12. I shot it several times this season with both 2 3/4 and 3 inch steel loads. It wacked the birds. I now have a LC Smith that I plan to send on down to Briley. It is a Grade 0 10 bore, made in 1912. I paid $700 for it. It will truely be a goose gun, as the weight is 10 pounds, 4oz.
While the total cost of first buying, then having those old 10s reworked might be more than you are interested in spending, I wanted to make you aware of the possiblity. As for just going ahead and buying a 2 3/4 inch old double, there is a world of them out there. As an example, several years ago I purchased a WW Greener F25 12 bore down in Australia. I leave it down there so I don't need to go through the nightmare of taking a gun into the country. I had it opened to LIGHT mod/mod. I shoot steel 3s with it, and it certainly kills the ducks!
Most important to me, I am happy that you want an old double. Those guns go right in train with hand carved decoys, Barnegat boats. They go a long way to make the day more enjoyable. Best of luck. Worth Mathewson