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This is what I find:

http://www.deutsches-jagd-lexikon.de/index.php/.375_R_Verney-Carron

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Der französische Ballistiker Joseph Messner entwicklete die .375 R Verney-Carron für Verney-Carron. Messner verwendete keine Mutterhülse sondern entwarf die Patrone auf dem Reizbrett. Wichtig war es die Hülse so zu dimensionieren, dass sich das Patronenlager einer .375 Holland & Holland oder .375 H&H Flanged problemlos aufreiben lässt. Alle Maße mussten somit größer sein. Leistungsmässig liegt sie im Bereich der .378 Weath. Mag., .416 Rigby oder .404 Jeffery.

Die randlose Version bildet die .375 Verney-Carron."

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The French ballistics expert Joseph Messner developed the .375 R Verney-Carron for Verney-Carron. Messner did not use any parent case but designed the cartridge on the drawing board. It was important for the case to be dimensioned so that the chamber easily wear out .375 Holland & Holland or .375 H & H Flanged. All measurements had thus be greater. Moderately performance within the range of .378 Weath. Mag, .416 Rigby or .404 Jeffery.

The rimless version is .375 Verney-Carron.

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Thankyou for your reply.

I also found the specs for the 375R VC listed in Quick Load.

It's quite a large case at 122gr H2O capacity vs 94gr for the 375 FL Mag Holland cartridge.

Looks as though they may have started with 450 basic cylinder brass?

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