THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT-ABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. assumes no responsibility for errors or omissions in these materials. USA These materials are provided by as a service to its customers and may be used for informational purposes only. Sponsors & Advertisers | DoubleGun Rack |Ĭopyright (c) 1993 - 2022. Shotgun recommended minimum wall thickness (p.4) for Standard Steel with tensile strength 700 - 849 N/sq. (BAR) = 13,920 psi proof pressure = 10,730 psi service pressure (SAAMI) Standard CIP proof pressure of 850 kg per sq. shot with a mean service pressure of 3 1/4 tons = (converted using Burrard's forumula) 9,682 psi.Ĭommission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (C.I.P) In the 1925 British Proof House revisions, the 2 1/2” & 2 5/8” 12g service load was reduced to 3 Drams with 1 1/8 oz. The pressure of that load would have been about 8500 psi with BULK smokeless powder with DENSE smokeless 9,500 - 10,500 psi.Ĭhamber immediately prior to forcing cone. Prior to 1924, the Belgian and British Service (using) maximum load for 12g 2 1/2” and 2 5/8” shells was 1 1/4 oz. 030"?Ĭourtesy of Hugh Lomas for English 12 bore Game guns.Ĭhamber immediately prior to forcing cone. Chukarguy: do you not mean 9" from the muzzle for.
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