The Mysteries Of Pressure Standards

How Changes In Measuring Procedures Have Caused Some Confusion

Many handloaders wonder why the pressure standards put forth by the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) vary so much between similar rifle cartridges. In some instances the answer is pretty straightforward and sometimes it’s not, but knowing the reasons can help us be safer handloaders, as well as put together consistent home-grown ammunition.

According to SAAMI’s website (, the organization was founded in 1926 “at the request of the federal government” as part of the American National Standards Institute. Their mission is “to create and promulgate technical, performance and safety standards in firearms, ammunition and components.”

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