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like paper shotshell's shotgun brass will vary in the measurement's. more than rifle brass. the case's I found have all the No. 36 (ga) headstamp but common brass was marked 11x52 or 11,15x65. you known the designation was never realy standardize for this round. before the 9,3x72R was coming on the market this 3 cartridges were know as "Drilling" cartridge because they were used most time in Drilling's. in the old day everyone was knowing that the basic brass for this rounds was No.36 ga shotgun brass and load in this. the 52mm long case was the start and the brass was later lengthen to hold more blackpowder. in the old catalogue's they distinguish between lancaster(center fire shotgun shells ) and lefaucheux ( pinfire shotgun shells)and the 11,15mm was the Lancaster Kugel or LK. a lancaster case loaded with a bullet. in fact this round is older than the british express cartridge's, maybe made just before 1860.
the load for the 11,15x65r was 4,5 gramm BP, same as for the 9,3x82R
I shot 28 bore full rifled, 480 grains lead bullet over 90 grains FFG. the brass, thin like paper, is anealed but dont need resizing. I think magtech brass is very good if it fits the chamber.

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Spectacular info, Lancaster! thank you for your help.

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