LONG VERSION
2006 British Rules of Proof
http://www.gunproof.com/Proof_Memoranda/RULESOFP.PDF Part IV, The Proof Load, Number 27, Part A
Calls for a load of 30% over mean service pressure at a point 17mm or 25mm (
about 1), and at a point 162mm (
6.38) from the breech face a load of 30% over mean service pressure.
Calculation of Proof Pressures.
26. Where not specified in C.I.P. Tables of Pressure, Proof Pressures shall be based on the mean maximum pressures developed by firing not less than five Service Loads or Special Loads.
Relation of Proof Pressure to Service Pressure
27. Where not specified in Tables each Proof Pressure shall be calculated so that it exceeds the highest mean Service Pressure or (in the case of Special Definitive Proof) the mean pressure developed by the Special Load of the arm by an amount which is equal to or greater than the amounts specified below:
(a) In the case of Provisional Proof of an arm, or barrel intended for an arm, of the First Class, when pressures are measured at a position 17mm or 25mm from the breech face, the amount of 30 per cent; and at a position 162mm from the breech face, the amount of 30 per cent.
(b) In the case of Provisional Proof of any other barrel or arm, when pressures are measured at a position indicated in C.I.P. Tables or where not so indicated as the Two Companies may think suitable, such amount as the Two Companies may agree.
(c) In the case of Definitive Proof or Special Definitive Proof of an arm of the First Class, when pressures are measured at both 17mm or 25mm and 162mm from its breech face, the amount of 30 per cent at the first point, or such increased amount as the Two Companies may agree.
(d) In the case of Definitive Proof or Special Definitive Proof of an arm of the Second or Third Class measured at such a position as the Two Companies may consider suitable, the amount of 30 per cent.
(e) In the case Definitive Proof or Special Definitive Proof of an arm of the Fourth Class measured in such manner as the Two Companies may consider suitable, the amount of 30 per cent.
28. (1) The minimum Proof Pressure for an arm of the First, Second and Third Class shall be that set out in C.I.P. Tables of Pressure or where not so set out, be such as the Two Companies shall from time to time determine.
Great Britain adopted the 1969 Commission Internationale Permanente pour l'Epreuve des Armes Feu Portatives standards March 1, 1980.
The Commission Internationale Permanente pour l'Epreuve des Armes Feu Portatives standards were not ratified until 1969.
http://www.cip-bobp.org/homologation/en/tdcc_public?page=1&cartridge_type_id=712g 65mm and 70mm Standard Proof lead or steel (limited to no larger than 3.25 mm and max. fps 1,300).
(Numbers are transducer BAR converted to PSI)
.....SERVICE pressure 740 BAR = 10,733 psi; Maximum statistical individual pressure 850 BAR = 12,328 psi
.....PROOF 930 BAR = 13,489 psi
12g 76 mm = 3 LEAD High performance/Superior Proof
.....Service 1050 BAR = 15,229 psi; Maximum statistical individual pressure 1200 BAR = 17,405 psi
.....Magnum proof 1320 BAR = 19,145 psi
12g STEEL regulations: the barrels should carry the High Performance Steel Fleur
de Lys stamp and be marked Steel Shot
http://www.chircuprodimpex.ro/produse/al...-ammunition.pdf Both 65 and 70 mm 16g standard is SERVICE 780 BAR or 11,313 psi;
Maximum SERVICE 900 BAR or 13,053 psi; PROOF 980 BAR or 14,214 psi.
Both 65 and 70 mm 20g standard is SERVICE 830 BAR or 12,038 psi;
Maximum SERVICE 950 BAR or 13,779 psi; PROOF 1040 BAR or 15,084 psi.
