Require some scientific guidance on peoples understanding of the concept of powder temperature (PT). 1. Definition of PT and how this effects internal ballistics; 2. Methods used to determine PT; 3. Ability to accurately determine PT amongst ammunition natures to include variations in powder and cartridges; 4. Correlating ambient temperature to support an accurate determination of PT for inputs in ballistics software. I've no doubt this has been covered somewhere in the past threads so feel free to point me in that direction. It is however a dry topic and thus I've found information hard to come by. I currently use Applied Ballistics software which enables PT as an input but have experienced significant inaccuracies when doing so, which may simply be attributed to my understanding of PT. Input appreciated. Cheers Willo.