Historically, .315 and smaller are for .32 caliber rifles and some cartridge firing pistols. Pietta and Palmetto revolvers can get by with .319s but Uberti's, like the originals, use at least a .323.
As always, best way to know for sure is to mike your chambers and slug your bore.
I have used both Hornady and hand-cast buckshot in my .31 cal opentops. These consist of steel frame and brass frame guns. I have not experienced any problems with either type ammo.
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