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Change in IMR 4064?

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Unread 07-30-2009, 12:22 PM
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Join Date: Feb 2002
Location: Colorado
Posts: 73
Change in IMR 4064?

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 42.0 grains

5th edition
7mm-08
168 SMK
Max load of IMR 4064 is 39.2 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?
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Matt
NRA Life Member

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