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7mm lrm
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<blockquote data-quote="WildRose" data-source="post: 1271718" data-attributes="member: 30902"><p>It's better in the long run for medium and large bore cartridges because instead of counting on one big pressure spike in the chamber and first inch or two it is spread out running most of the length of the barrel to attain higher velocities with lower pressures. Just think of it as a slow, gradual push down the pipe rather than hitting it with a hammer.</p><p></p><p>Slower burning powders by design have higher volume typically. Again, if we only had one powder or one single fast burn rate of powder to choose from the "efficiency" argument would have merit but of course that is not the case.</p><p></p><p>I would never for a minute think of using 92gr of H-414 in my .300 Rum's, if I did I'd be building a bomb instead of building a load, but 92gr of RL 25, 26, or 33 is a nice fit and gives great velocity, low ES's and very good barrel life.</p><p></p><p>I'm not sure what your point is about neck sizing only. Most people shooting belted magnums will full length resize most of the time, those of us looking for precision will neck size for two or three firings and full length resize when needed in between.</p></blockquote><p></p>
[QUOTE="WildRose, post: 1271718, member: 30902"] It's better in the long run for medium and large bore cartridges because instead of counting on one big pressure spike in the chamber and first inch or two it is spread out running most of the length of the barrel to attain higher velocities with lower pressures. Just think of it as a slow, gradual push down the pipe rather than hitting it with a hammer. Slower burning powders by design have higher volume typically. Again, if we only had one powder or one single fast burn rate of powder to choose from the "efficiency" argument would have merit but of course that is not the case. I would never for a minute think of using 92gr of H-414 in my .300 Rum's, if I did I'd be building a bomb instead of building a load, but 92gr of RL 25, 26, or 33 is a nice fit and gives great velocity, low ES's and very good barrel life. I'm not sure what your point is about neck sizing only. Most people shooting belted magnums will full length resize most of the time, those of us looking for precision will neck size for two or three firings and full length resize when needed in between. [/QUOTE]
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