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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
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<blockquote data-quote="Sennaspeed" data-source="post: 589279" data-attributes="member: 33556"><p>What constitutes a "properly loaded" 7RM? </p><p></p><p>The SAAMI MAP for the 7RM is 61k PSI while the MAP of the 7Wby is a full 65k. The 7RM can match the 7Wby only by exceeding SAAMI MAP. SAAMI cites unexplained pressure spikes with the 7RM case and therefore lowered their MAP to stay on the safe side when these spikes occur. (the 243W suffers the same malady and the same solution was utilized.</p><p></p><p>When all are loaded to their SAAMI MAP the 280AI will be right at 7RM velocities and the 7Wby will be the fastest.</p><p></p><p>I'm pushing the 162gr Amax to a consistent 3050fps using 64gr of Magpro in a 26" barrel. The 168VLD exits at 2990-3000 using the same load. Both Magpro loads are one grain under max (per Johan Loubser, ballistician at Accurate Powder) and QL shows pressure to be below the MAP but given my high velocity I'm calling both loads maximum even though I'm experiencing zero pressure signs.</p><p></p><p>Keep up the great work Fifty, I enjoy reading your responses.</p></blockquote><p></p>
[QUOTE="Sennaspeed, post: 589279, member: 33556"] What constitutes a "properly loaded" 7RM? The SAAMI MAP for the 7RM is 61k PSI while the MAP of the 7Wby is a full 65k. The 7RM can match the 7Wby only by exceeding SAAMI MAP. SAAMI cites unexplained pressure spikes with the 7RM case and therefore lowered their MAP to stay on the safe side when these spikes occur. (the 243W suffers the same malady and the same solution was utilized. When all are loaded to their SAAMI MAP the 280AI will be right at 7RM velocities and the 7Wby will be the fastest. I'm pushing the 162gr Amax to a consistent 3050fps using 64gr of Magpro in a 26" barrel. The 168VLD exits at 2990-3000 using the same load. Both Magpro loads are one grain under max (per Johan Loubser, ballistician at Accurate Powder) and QL shows pressure to be below the MAP but given my high velocity I'm calling both loads maximum even though I'm experiencing zero pressure signs. Keep up the great work Fifty, I enjoy reading your responses. [/QUOTE]
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