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Rifles, Reloading, Optics, Equipment
Reloading
Temp sensitivity of powders
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<blockquote data-quote="Michael Eichele" data-source="post: 228833" data-attributes="member: 1007"><p>For me it seems that my rifle have grouped the same from temp to temp where as the long range POI has changed higher or lower. </p><p></p><p>My theory is that the powder charge weight creates as certain harmonic node in the barrel despite a ever so slight change in burn rate. This rate of burn change in very very small. I believe this beacuse certain powders have such a similar burn rate and almost always have the same velocity at the same charge weights. For example I have shot IMR 4064, VARGET and RL-15 at the same charges with VERY close velocities (within 20 FPS) and accuracy was similar. When going to a drasticaly different powder of the same charge weight, it is either conciderably faster or slower. A dramticaly different burn rate causes a different node hence the differing group sizes. This is just my theory. Every rifle and load should be tested in varying conditions so as to KNOW for sure how they will act.</p><p></p><p>PS, I have used one powder in my 300 RUM that increased velocity when the loads got colder.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 228833, member: 1007"] For me it seems that my rifle have grouped the same from temp to temp where as the long range POI has changed higher or lower. My theory is that the powder charge weight creates as certain harmonic node in the barrel despite a ever so slight change in burn rate. This rate of burn change in very very small. I believe this beacuse certain powders have such a similar burn rate and almost always have the same velocity at the same charge weights. For example I have shot IMR 4064, VARGET and RL-15 at the same charges with VERY close velocities (within 20 FPS) and accuracy was similar. When going to a drasticaly different powder of the same charge weight, it is either conciderably faster or slower. A dramticaly different burn rate causes a different node hence the differing group sizes. This is just my theory. Every rifle and load should be tested in varying conditions so as to KNOW for sure how they will act. PS, I have used one powder in my 300 RUM that increased velocity when the loads got colder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Temp sensitivity of powders
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