Originally Posted by willo
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.
That's a tall order and smarter people than me will have to chime in on this one.
I use 70o as ambient and test different loads to see the change if heated to 100o or cooled to 30o
(The normal range of temperatures I hunt in)
Each powder has a difference tolerance for temperatures so when I can get the accuracy and velocity that I want I use the extreme powders from Hodgdon because they are very stable in this range.
I am forced to use other powders at times because they produce better results and have to adjust to these temperature changes and the effects on POI.
I doubt that there is any common number that you could use to calculate the effects of temperature on different powders, But maybe some of the guys can help you.
Interesting question, Hopefully I can learn something from this.
J E CUSTOM