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Rifles, Reloading, Optics, Equipment
Reloading
flat/blown primer within recommended specs
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<blockquote data-quote="mk443" data-source="post: 987864" data-attributes="member: 29848"><p>I have been working out a load for my rifle and when I go by my manual/hodgen specs and get in the mid/high range I'm flattening primers and at the high range I actaully blew a primer. Here is what is recommended: </p><p>7mm STW, 180 berger VLD, Retumbo, 24 in barrel, 1-10 twist, federal magnum primer, brass 2.840</p><p>COAL=3.655 Grs: 69.3-73.8</p><p></p><p>Here is my set up:</p><p>7mm STW 180 berger Hybrid, Retumbo, 27.5 in barrel, 1-9 twist, winchester magnum primer, brass 2.840</p><p>COAL= 3.91 just off the lands, </p><p></p><p>69-72 grains shoots great with 71 shooting very very well in a test group. 73 grains had slight flattening on the primers, a 74 gr load blew the primer. </p><p></p><p>Could the longer COAL and longer barrel and faster twist be causing the additional pressure? I'm planning on running the 71 gr load through the chrono to see what speeds its pushing out but to be honest I thought I would be able to push the load a little hotter since recommended specs usually are set lower. Any input would be great. </p><p></p><p></p><p>gun)</p></blockquote><p></p>
[QUOTE="mk443, post: 987864, member: 29848"] I have been working out a load for my rifle and when I go by my manual/hodgen specs and get in the mid/high range I'm flattening primers and at the high range I actaully blew a primer. Here is what is recommended: 7mm STW, 180 berger VLD, Retumbo, 24 in barrel, 1-10 twist, federal magnum primer, brass 2.840 COAL=3.655 Grs: 69.3-73.8 Here is my set up: 7mm STW 180 berger Hybrid, Retumbo, 27.5 in barrel, 1-9 twist, winchester magnum primer, brass 2.840 COAL= 3.91 just off the lands, 69-72 grains shoots great with 71 shooting very very well in a test group. 73 grains had slight flattening on the primers, a 74 gr load blew the primer. Could the longer COAL and longer barrel and faster twist be causing the additional pressure? I'm planning on running the 71 gr load through the chrono to see what speeds its pushing out but to be honest I thought I would be able to push the load a little hotter since recommended specs usually are set lower. Any input would be great. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
flat/blown primer within recommended specs
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