The post-1924 and pre-1969
CIP Belgian 16g was proved for a service load of 600 kg/cm2 = 8534 psi
+ 10-14% (for modern transducer numbers) maximum service pressure; and proved at 900 kg/cm2 = 12,800 psi + 10-14%
CIP for both 65 and 70 mm 16g is service is 780 BAR or 11,313 psi; MSIP 900 BAR or 13,053 psi
I've never found a published pressure for the 16g Super-X 'Field' 1 1/8 oz loads but the 12g 2 3/4” ‘Field’ 1 1/4 oz. (presumed 1330 fps) was 10,750 psi + 10-14%. 16g would be higher.
The Golden Pheasant boomers are no doubt at the SAAMI max. of 11,500 psi
As painful as it is to admit, I must agree with ed
The weight of the barrels at the time of proof was 1.232 Kg = 2.72#. Weight of the gun is likely about 6# (what is the actual weight Greg?). Recoil will be > 25 ft/lbs with that load. Why risk a cracked stock on a very nice gun?
