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Rifles, Reloading, Optics, Equipment
Reloading
7 SAUM Seating Heavies Long
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<blockquote data-quote="mooredj" data-source="post: 3067996" data-attributes="member: 121913"><p>I have found this to be true and the only way to improve on the velocity is to pick a different powder. For instance, in GRT modeling for the 7 SAUM, I can get to 2900 FPS with H1000, but If I use 4831 or 4350, I can only ever get to 2850 or so holding the pressure (60000psi) constant. I set up the freebore out to 0.218 with 1.5 degree throat angle to allow shooting the Berger 195. You have to get more powder behind the bullet in order to get there. I shoot a LA in order to do this.</p><p></p><p>A little modeling below for the 7 SAUM and 195 Berger. The freebore is actually 0.218 the way most everybody understands it. I show 0.236 in the title because I add in the chamber to bore transition (0.018) right before the freebore so 0.018+0.218-0.236. Just noting so I don't cause confusion with what is shown. This is using H1000 with a compressed load. Currently shown with a 0.030 jump and the bullet seated with the boat tail slightly above (0.022) the case neck junction. I can get to 2900fps with 62.3 grains of powder. The issue I will run into is seating the bullet less over time due to throat wear and eventually getting close to running out of enough neck to adequately hold the bullet. Depending on how often I shoot it, that could be a long time from now.</p><p></p><p>[ATTACH=full]556872[/ATTACH]</p></blockquote><p></p>
[QUOTE="mooredj, post: 3067996, member: 121913"] I have found this to be true and the only way to improve on the velocity is to pick a different powder. For instance, in GRT modeling for the 7 SAUM, I can get to 2900 FPS with H1000, but If I use 4831 or 4350, I can only ever get to 2850 or so holding the pressure (60000psi) constant. I set up the freebore out to 0.218 with 1.5 degree throat angle to allow shooting the Berger 195. You have to get more powder behind the bullet in order to get there. I shoot a LA in order to do this. A little modeling below for the 7 SAUM and 195 Berger. The freebore is actually 0.218 the way most everybody understands it. I show 0.236 in the title because I add in the chamber to bore transition (0.018) right before the freebore so 0.018+0.218-0.236. Just noting so I don't cause confusion with what is shown. This is using H1000 with a compressed load. Currently shown with a 0.030 jump and the bullet seated with the boat tail slightly above (0.022) the case neck junction. I can get to 2900fps with 62.3 grains of powder. The issue I will run into is seating the bullet less over time due to throat wear and eventually getting close to running out of enough neck to adequately hold the bullet. Depending on how often I shoot it, that could be a long time from now. [ATTACH type="full" alt="1711247048035.png"]556872[/ATTACH] [/QUOTE]
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7 SAUM Seating Heavies Long
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