@mcb
SAAMI and C.I.P. use the same transducer from the same swiss company for measuring pressure (psi or bar). But the placement of the transducer differs.
The military uses still another placement because they want to spent less time on each measurement.
The CIP proofing of ammo requires a hole to be drilled into the cartridge to place the transducer. Here the actual pressure in the cartridge is measured. I dont know about SAAMI ... but that doesnt matter. Indeed ammo will deliver different results when testes according to SAMMI and test accirding to CIP. I believe ... dont know ... that for a given ammo the CIP value is allways higher than the SAAMI pressure value.
When american ammo is sold in europe it passes with no problems the cip proofing. I am told no ammo certified to meet SAAMI spec will ever be too powerfull for C.I.P.
When Geco started producing 9mm ammo for IPSC for the european market, they stayed within the limits of CIP but approached the upper limit. Til then 9mm IPSC shooters relying on factory ammo would fail from time to time the needed factor of 125. Now there is an ammo that meets the requirements. I am told that this ammo is sold on the US market as +P. I guess Geco uses a different brand in the US.
That is why i asked about SAAMI specs concerning pressure. If a US manufactured rifle hits the european market it will be CIP proofed. And i am pretty sure they dont make any differences when producing a rifle wether it stays in the US or goes oversea. So why should there be any concern regarding pressure using 5.56 in .223 in the US if the rifle will meet cip requirements wether it is proofed or not.