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Change in IMR 4064?

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Unread 07-30-2009, 12:22 PM
Bronze Member
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.

4th edition (50th anniversary)
168 SMK
Max load of IMR 4064 is 42.0 grains

5th edition
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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