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Long Range Hunting & Shooting
Interpreting SAAMI Specs
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<blockquote data-quote="Ray Gross" data-source="post: 2721427" data-attributes="member: 95172"><p>Yes. It is normal among SAAMI specs for max cartridge headspace to exceed minimum chamber headspace. Keep in mind that there is a significant gap at the other extreme, from min cartridge to max chamber. </p><p></p><p>I specifically asked a couple of the SAAMI engineers about this at last years SHOT Show and was told that they had established that velocity SD's where significantly reduced for ammo that was tightly fitted into the chamber. As I recall, it had to do with the more consistent primer ignition. </p><p></p><p>I don't believe the intent was ever that commercial manufacturers would make ammo larger/longer than the chamber. In fact, I would suggest that the ammo manufacturers would (and do) run their manufacturing tolerances inside of the SAAMI specs, and below the minimum chamber specs. Indeed, that is exactly what you see when using commercial ammo and commercial chambers.</p></blockquote><p></p>
[QUOTE="Ray Gross, post: 2721427, member: 95172"] Yes. It is normal among SAAMI specs for max cartridge headspace to exceed minimum chamber headspace. Keep in mind that there is a significant gap at the other extreme, from min cartridge to max chamber. I specifically asked a couple of the SAAMI engineers about this at last years SHOT Show and was told that they had established that velocity SD's where significantly reduced for ammo that was tightly fitted into the chamber. As I recall, it had to do with the more consistent primer ignition. I don't believe the intent was ever that commercial manufacturers would make ammo larger/longer than the chamber. In fact, I would suggest that the ammo manufacturers would (and do) run their manufacturing tolerances inside of the SAAMI specs, and below the minimum chamber specs. Indeed, that is exactly what you see when using commercial ammo and commercial chambers. [/QUOTE]
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