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Greetings,
I may have stumbled over the big difference with the .223. Much of the sporting .223 ammo in the US is shot in semi auto rifles where port pressure is important. On the continent this is...

I think we need to remember that these are different standards measured with different equipment in a different way. We can't just convert one to the other and expect the same result. We are not...

CIP is not measured in PSI but in M Pa or Bar so they have been converted. The US is the only country still using PSI. There are good descriptions on the differences on the net. For many years...

CIP is continental and SAAMI is US. They are measured slightly differently and the max pressure for some cartridges may differ as I understand it.
GPM.