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Tennessee Gun Owners Forums
Reloading
7mm PRC Optimal powder charge help... update... I give up!!!!
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<blockquote data-quote="jlanecr500" data-source="post: 5859028" data-attributes="member: 16430"><p>Ok, recalc the loads. Can see why groups tightened up at 67.5gr . Thats the desired barrel time for that node 1.175ms. Of course, you can drop to the next node at 1.285ms but you'll lose considerable velocity. The QL calculated load is below.</p><p>One little tidbit. With this particular load, for every .1" the COAL is reduced below 3.345, the charge reduces by 1gr, barrel time, velocity and pressure stay the same.</p><p>[ATTACH=full]218180[/ATTACH]</p><p></p><p>The following QL calculated load is N565. The pressure is higher and velocity nearly the same. The bottom line is that no matter what brass you get, your velocity will never make it to 2900 fps. The PRC needs additional barrel length.</p><p>[ATTACH=full]218181[/ATTACH]</p></blockquote><p></p>
[QUOTE="jlanecr500, post: 5859028, member: 16430"] Ok, recalc the loads. Can see why groups tightened up at 67.5gr . Thats the desired barrel time for that node 1.175ms. Of course, you can drop to the next node at 1.285ms but you'll lose considerable velocity. The QL calculated load is below. One little tidbit. With this particular load, for every .1" the COAL is reduced below 3.345, the charge reduces by 1gr, barrel time, velocity and pressure stay the same. [ATTACH type="full" alt="20240303_184545.jpg"]218180[/ATTACH] The following QL calculated load is N565. The pressure is higher and velocity nearly the same. The bottom line is that no matter what brass you get, your velocity will never make it to 2900 fps. The PRC needs additional barrel length. [ATTACH type="full" alt="20240303_185132.jpg"]218181[/ATTACH] [/QUOTE]
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Tennessee Gun Owners Forums
Reloading
7mm PRC Optimal powder charge help... update... I give up!!!!
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