When I first saw the cases I thought they looked pretty modern for a case design from 1911 (or 1889). Fairly straight body with a relatively short neck and a 30 degree shoulder. The rim diameter is an odd size at .498 but cases can be made from .284 Winchester brass.

I'm guessing that American shooters were so wed to the .473 head size that this one never got looked at seriously but seeing the case capacity which is better than the .308 or even comparable 57mm cases and the increased shoulder angle I'm a little surprised it wasn't latched on to by earlier wildcatters. It would make a nice short .25 caliber and you could easily keep the OAL down into the 2.8" range for short actions.

Here are five fresh ones ready to go. Those are Hornady 150 gr. Spire Points with the cannelure buried in the neck. Since these were part of my very first batch they were seated to the Hornady manual COL spec which actually leaves the ogives pretty close to the lands.

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Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!