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Rifles, Reloading, Optics, Equipment
Reloading
IMR 4350 to H4350 in 30-06
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<blockquote data-quote="nicholasjohn" data-source="post: 1940101" data-attributes="member: 109113"><p>I've read that the temperature sensitivity can vary with different bullet weights, and from one cartridge to another. I've not seen this written anywhere, but I think differences in expansion ratios are probably a factor in this variability. There is probably a perfect combination of bore diameter, case capacity and bullet weight for each powder, but finding this "balance point" would be darn near impossible. </p><p></p><p>I saw a study that my buddy sent me showing the relative sensitivity of various powders, and H-4831 had the lowest variability among the powders in the test. ( H-4350 and Varget were pretty close behind it.) All the Hodgdon Extreme powders tested well, and I remember that IMR 4350 also did pretty well. My buddy was working with RL-22 at the time, and it did not test favorably. Ball powders showed a lot of variability as well.</p><p></p><p>With your relocation to Utah you will be shooting at different elevations as well as varying temperatures. This will cause a lot of trajectory changes for you as well. You mentioned that you consider yourself to be a bit "OCD," so you have probably also considered that as a big factor in the changing zero of your rifles. I wouldn't really call that obsessive - you're just a detail-oriented shooter. I think that's pretty much where we all find ourselves.</p></blockquote><p></p>
[QUOTE="nicholasjohn, post: 1940101, member: 109113"] I've read that the temperature sensitivity can vary with different bullet weights, and from one cartridge to another. I've not seen this written anywhere, but I think differences in expansion ratios are probably a factor in this variability. There is probably a perfect combination of bore diameter, case capacity and bullet weight for each powder, but finding this "balance point" would be darn near impossible. I saw a study that my buddy sent me showing the relative sensitivity of various powders, and H-4831 had the lowest variability among the powders in the test. ( H-4350 and Varget were pretty close behind it.) All the Hodgdon Extreme powders tested well, and I remember that IMR 4350 also did pretty well. My buddy was working with RL-22 at the time, and it did not test favorably. Ball powders showed a lot of variability as well. With your relocation to Utah you will be shooting at different elevations as well as varying temperatures. This will cause a lot of trajectory changes for you as well. You mentioned that you consider yourself to be a bit "OCD," so you have probably also considered that as a big factor in the changing zero of your rifles. I wouldn't really call that obsessive - you're just a detail-oriented shooter. I think that's pretty much where we all find ourselves. [/QUOTE]
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Reloading
IMR 4350 to H4350 in 30-06
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