I cast a couple hundred 44 cal bullets this afternoon and decided to check the BHN after the first 50 had cooled and they were about 11-11.5. Some hours later I checked again wondering if I had correctly measured the first ones and they turned out to be 12.5. Is that possible? For them to harden in less than 24 hours by one BHN number seems out of the ordinary. The actual numbers, according to the Lee tester were originally .068, which is 11.0, and then some hours alter .064(12.5).