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Old October 7, 2012, 10:45 PM   #2
Sevens
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Join Date: July 28, 2007
Location: Central Ohio
Posts: 8,302
I would certainly bet that you are seeing higher velocities and higher pressures on warmer days -- and if the ammo is sitting in the sun for a good bit on a hot day (or left on the seat of a car...), I'd bet it would go even higher.

Hodgdon says that 40.2 grains is a max load for the Hornady A-Max (not the same bullet you used), but if you didn't see a whole bunch of high pressure indicators when you shot the load at 80 degrees, I wouldn't guess that it's a dangerous load...but every rifle is different.
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