Try to find one box of B & P Comp One shells to try. They are not specialty loads as such, but do feature much lower pressure, at about 6000 psi. They're one ounce loads and hit plenty hard for smaller game birds. The reason I suggest only trying one box is to see if you have any problems with misfires, as I have had. Most of my vintage hammerless doubles will not fire them reliably, there being many light primer strikes due to a minute difference in shell rim shape allowing for excess headspace. All of my hammer guns fire them 100%. There is a simple and easy way around the misfiring, however, if anyone is interested.
Whatever chokes you would use for lead loads will be fine with bismuth loads. With steel you'd need to open up the choke somewhat, as it patterns so much tighter.
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