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Rifles, Reloading, Optics, Equipment
Reloading
POI shift with new IMR 4064 batch
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<blockquote data-quote="SubMOAR" data-source="post: 1201407" data-attributes="member: 94212"><p>Hello,</p><p></p><p>I have been using IMR 4064 for my .308 Win for a while now with great results. I always get great accuracy and low ES/SD's. </p><p></p><p>My go to load is the Hornady ELD-Match with 39.7 grains of IMR 4064, seated at 0.020" off lands. CCI 200 primers with LC brass. This load has been 1/2 MOA if I do my part.</p><p></p><p>I have a problem now though, I am running out of my Swiss made IMR 4064, and just received a new Canadian made batch. I loaded up several of each, and went out to compare at 100 yards to make sure the transition will be smooth. Unfortunately that is not the case. My Swiss IMR 4064 is zeroed with a velocity of 2,330 fps. I tried the Canadian made- IMR 4064 and found that the POI was over 4" low. Velocity was 2,305 fps.</p><p></p><p>With all factors being the same except the powder manufactured in different parts of the world, how can this cause such a drastic POI shift, especially since the velocity was not greatly different either? Accuracy of the Canadian made IMR 4064 was the same as the Swiss. This has to be something with barrel harmonics, I just don't understand it. Anyone have any insight?</p></blockquote><p></p>
[QUOTE="SubMOAR, post: 1201407, member: 94212"] Hello, I have been using IMR 4064 for my .308 Win for a while now with great results. I always get great accuracy and low ES/SD's. My go to load is the Hornady ELD-Match with 39.7 grains of IMR 4064, seated at 0.020" off lands. CCI 200 primers with LC brass. This load has been 1/2 MOA if I do my part. I have a problem now though, I am running out of my Swiss made IMR 4064, and just received a new Canadian made batch. I loaded up several of each, and went out to compare at 100 yards to make sure the transition will be smooth. Unfortunately that is not the case. My Swiss IMR 4064 is zeroed with a velocity of 2,330 fps. I tried the Canadian made- IMR 4064 and found that the POI was over 4" low. Velocity was 2,305 fps. With all factors being the same except the powder manufactured in different parts of the world, how can this cause such a drastic POI shift, especially since the velocity was not greatly different either? Accuracy of the Canadian made IMR 4064 was the same as the Swiss. This has to be something with barrel harmonics, I just don't understand it. Anyone have any insight? [/QUOTE]
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POI shift with new IMR 4064 batch
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