R3;

A person from Alliant back in the 1980's said they were having problems with inconsistant pressures with the new tests of the 125gr Jhp bullets in their labs.

14.0grs was getting around 38,000 psi, where the new pressures for this load should be 35,000 psi per the legal staff, with the new style of "Light Magnum" guns now on the market,for everyones safty,which is a good thing.

I have no idea if this was the time Hercules and Alliant powders were changed over..... or if the powders were changed at this time for the "New Cleaner" powder type improvements,just that the powder has changed and modern data should be used .

As for the temperature thing.......its water under the bridge,now.

Stay safe