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Rifles, Reloading, Optics, Equipment
Reloading
Change in IMR 4064?
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<blockquote data-quote="Matt_G" data-source="post: 299881" data-attributes="member: 410"><p>Does anyone here know if there has been a significant change in the burn rate of IMR 4064 in the past few years?</p><p></p><p>I ask because I am noticing a big difference in 7mm-08 loads in my two Sierra manuals.</p><p>Specifically:</p><p></p><p>4th edition (50th anniversary)</p><p>7mm-08</p><p>168 SMK</p><p>Max load of IMR 4064 is <strong>42.0</strong> grains</p><p></p><p>5th edition</p><p>7mm-08</p><p>168 SMK</p><p>Max load of IMR 4064 is <strong>39.2</strong> grains</p><p></p><p>That is a pretty big drop in the max load.</p><p>So what is going on here?</p><p>Did the powder change that much?</p><p>Different testing methodology?</p><p>Or is the 39.2 grain max load a "lawyer" load?</p></blockquote><p></p>
[QUOTE="Matt_G, post: 299881, member: 410"] Does anyone here know if there has been a significant change in the burn rate of IMR 4064 in the past few years? I ask because I am noticing a big difference in 7mm-08 loads in my two Sierra manuals. Specifically: 4th edition (50th anniversary) 7mm-08 168 SMK Max load of IMR 4064 is [b]42.0[/b] grains 5th edition 7mm-08 168 SMK Max load of IMR 4064 is [b]39.2[/b] grains That is a pretty big drop in the max load. So what is going on here? Did the powder change that much? Different testing methodology? Or is the 39.2 grain max load a "lawyer" load? [/QUOTE]
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Change in IMR 4064?
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