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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
to ackley or not
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<blockquote data-quote="Sennaspeed" data-source="post: 589461" data-attributes="member: 33556"><p>I completely agree that the 7RM case is every bit as strong as the Wby and should by all rights be capable of handling 65k but ballistics labs have noted unexplained pressure spikes in the 7RM since it's intro in 1962.</p><p>After many of these reports SAAMI took note and concluded that a pressure reduction was in order to compensate for these pressure spikes.</p><p>Since the publishers of loading manuals are reluctant to publish loads which exceed SAAMI MAP (the standard used by the industry) the loads for the 7RM reflect that lower limit.</p><p>Loading the 7RM to 65k means exceeding the latest data whilst not exceeding 65k. How is that pressure determined absent proper equipment?</p><p>At the same time you run the risk of exceeding safe and sane pressures should you experience one of those anomalous pressure spikes which seem to be peculiar to the 7RM and the 243 W.</p></blockquote><p></p>
[QUOTE="Sennaspeed, post: 589461, member: 33556"] I completely agree that the 7RM case is every bit as strong as the Wby and should by all rights be capable of handling 65k but ballistics labs have noted unexplained pressure spikes in the 7RM since it's intro in 1962. After many of these reports SAAMI took note and concluded that a pressure reduction was in order to compensate for these pressure spikes. Since the publishers of loading manuals are reluctant to publish loads which exceed SAAMI MAP (the standard used by the industry) the loads for the 7RM reflect that lower limit. Loading the 7RM to 65k means exceeding the latest data whilst not exceeding 65k. How is that pressure determined absent proper equipment? At the same time you run the risk of exceeding safe and sane pressures should you experience one of those anomalous pressure spikes which seem to be peculiar to the 7RM and the 243 W. [/QUOTE]
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