Thread: Gunpowder
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Old May 23, 2012, 07:11 PM   #5
Archie
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Join Date: May 26, 2000
Location: Hastings, Nebrasksa - the Hear
Posts: 2,209
There's a caveat!

They are designed to be the same burning rate. However, burn rates do vary between lots of powder, so a 'maximum' charge with that 'old' lot of powder one had last year may be a bit over maximum with the new lot one bought this week.

I once - long ago when I was younger and didn't get enough sleep - used a new can of H4831sc in my 'heavy' load in an 'improved' .30-06. Chronographed a 200 grain Sierra SPBT at just over 3150 f/s. Nothing went really wrong, except I could decap the brass (only five rounds) by blowing into the case mouth. As best I could figure, it was running about 80,000 psi.

Not Hodgdon's fault, my fault for not pay attention to the powder change.
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