Dig,
Very nice! What chamber length? Just curious, knowing that there were really no hard standards in place back when that gun was made. Regardless, 25 grams of US #7 [.100"] shot should do the trick on pigeons just fine somewhere between 1050 and 1200fps.
And in the FWIW Dept. there are some published loads for 20's using IMR 800X that have wonderfully low pressures. A friend & I both thot they were typos when we first saw the low pressures listed, so we specifically made inquires. It wasn't a misprint, the low pressures listed are, in fact, perfectly legit.
Bbl. length aside, I'd hope the gun proves the 'magic wand' you seek in a small bore. Do let us know how the sport goes w/it.
Kind regards, tw
