I load 32/40 for Schuetzen Rifles. Many different possable loadings, I think your three barrel gun would be a lot happier with the old factory lead bullet load. 165 grain @ 1400 FPS. 32/40 can give good target & I expect Turkey results at 1250 fps too. In fact for gallery matches were sub sonic is required I use a 115 gr bullet @ 950 FPS.
There were factory HS loads at 1900 FPS with 165 G Jacketed bullets too. Probably way to hot for a break action. I have several old loading manuals with data covering some modern powders like Unique and 4227 if you plan to load. You can make 32/40 cases out of easier to obtain 38/55 too.
William
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