With reloading, there is probably infinite combinations available to today's shooter.
They are not telling anyone anything, but they are recommending what should and shouldn't be used based on factory loads in factory chamber/barrel combinations...
SAAMI | Sporting Arms and Ammunition Manufacturers' Institute
The Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) is an association of the nation's leading manufacturers of firearms, ammunition and components. SAAMI was founded in 1926 at the request of the federal government and tasked with:
•Creating and publishing industry standards for safety, interchangeability, reliability and quality
•Coordinating technical data
•Promoting safe and responsible firearms use
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