Greg, your gun has the common modern proof under the rules of 1924. And the Golden Pheasant only gives you 15 fps more velocity than do the more commonly seen "high brass" loads for the 16ga (1295 fps vs 1310 with the GP.) But if you really want to be safe, you could send 5 GP shells to someone like Tom Armbrust to have them tested for pressure. The rules of 1924 do include double and triple proof, and your gun doesn't show the proofmarks for either of those.