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3) The belt is/was designed for reliability…it controls the critical primer impact position. Is there published test data showing this? I have seen these issues, but always when caseforming.
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I do believe that the first cartridge with a belt was the Holland and Holland .300. Added for headspacing purposes due to the H&H .300's long tapered case, sans shoulder. It was added for headspacing, nothing more, nothing less.
https://en.wikipedia.org/wiki/Belted_magnum