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There is no "11x60 Schuler" cartridge, though rifles by the A. Schüler/Schueler (German Umlaut), Suhl, company made rifles for several cartridges in that range over the years, like 11.15x60R M71 or 11.15x60R LK. But as you describe your rifle as a Stutzen (or do you have two?), I assume you are looking for data for the 11.2x60, DWM case number 41A, a Schüler development indeed. This was a rebated rim version of the 11.15x60R M71 Mauser aka .43 Mauser, loaded with smokeless powder and jacketed bullets to about .30-30 pressures. The rim was rebated to fit an unaltered standard 8x57/.30-06 size bolt head. Richard Schüler introduced the cartridge about 1905 for use against dangerous game in the then African colonies. For this use it was soon replaced, from 1907 on, by Schueler's much more powerfull 11.2x 72. As most 11.2x60 rifles were exported, they are extremely rare now. I don't know about any modern load data for this number.
But I found original 1930s DWM data: The 11.2x60 used a 21.5 g = 332 gr jacketed bullet in front of 4g = 61.7gr of the obsolete R5 powder for a muzzle velocity of 680 m/s = 2230 fps. But note, this velocity was from a 72 cm = 28.3" test barrel. So you should expect markedly less fps from a shorter Stutzen barrel, about 2000 fps. The old R5 = Rottweil No.5 was apparently slightly faster than 4064. In several of such old , odd cartridges I replaced it, grain for grain, successfully with VV N140 as a starting load. In a 10.75x45R Gründig double rifle this recipe even regulated at the first try.
Cases can be fabricated from .458 Win Mag or other such belted cases: remove the belt on a lathe, turn rebated rim to .470 - .475", cut new extractor groove. Form cases in a 11.15x60R aka .43Mauser fl die. trim to 60 mm = 2.36". The biggest problem will be: finding suitable .440" bullets in the 300 – 350 gr range. Perhaps you can swage down soft jacketed .458" bullets?

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