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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mmRUM & Retumbo
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<blockquote data-quote="Guest" data-source="post: 25341"><p>Speedbump </p><p> </p><p>I read somewhere the other day that MRP II was slower than RL-25. The person wrote that it was looking about 5 grains slower, but there was also a comment about it being </p><p>"close in burn rate". This confused me because I do not consider a 6 percent difference close at all, and it made me wonder if there was a typo and the guy meant 5 tenths of a grain slower. </p><p> </p><p>My point being that there is a big GAP in powder burn rates, right where the Ultra MAGs and Wolfs and other wildcats want to operate. 50 BMG is a tad too slow, and H1000 is a tad too fast. Retumbo is only 3 grains slower than RL-25 and does not quite equal the velocity to pressure ratio of RL-25. I think if MRP II is actually 5 whole grains slower than RL-25 it would be closer to IDEAL than anything I have tested, it would just about split the gap in burn rate, and would be very interesting to me if I was testing for a 7mm UM.</p></blockquote><p></p>
[QUOTE="Guest, post: 25341"] Speedbump I read somewhere the other day that MRP II was slower than RL-25. The person wrote that it was looking about 5 grains slower, but there was also a comment about it being "close in burn rate". This confused me because I do not consider a 6 percent difference close at all, and it made me wonder if there was a typo and the guy meant 5 tenths of a grain slower. My point being that there is a big GAP in powder burn rates, right where the Ultra MAGs and Wolfs and other wildcats want to operate. 50 BMG is a tad too slow, and H1000 is a tad too fast. Retumbo is only 3 grains slower than RL-25 and does not quite equal the velocity to pressure ratio of RL-25. I think if MRP II is actually 5 whole grains slower than RL-25 it would be closer to IDEAL than anything I have tested, it would just about split the gap in burn rate, and would be very interesting to me if I was testing for a 7mm UM. [/QUOTE]
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7mmRUM & Retumbo
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