Mark: I suspect your gun was built around the turn of the last century and that it has 2 7/8-inch chambers which are original (and more common by that date). Assuming your gun has been okayed by an expert, appropriate low-pressure factory loads can be purchased from several sources often discussed here. Others on this board may also be able to share low-pressure recipes for various applications. I hope you enjoy your new acquisition. You describe it as light ... just what does it weigh? TT

"The very acme of duck shooting is a big 10, taking ducks in pass shooting only." - Charles Askins