Butterbean - I’m hoping you can help me understand this better, and how you would use the data. I’m new to reloading and my experience so far is limited to Varget and H4350, which I think are very stable powders. As I’m doing research on loads for a wildcat I'm in the process of building, I’m seeing powders referenced that seem to be less stable than those mentioned above, and I want to make sure I don’t create an unknown problem in winter that I end up regretting when I pull it out to practice in July.
Looking at the temp stability chart, it seems like the chart is organized by manufacturer with the faster powders on top, slower on the bottom, correct?
I think what’s making it difficult for me to get my head wrapped around is many of the powders listed don’t show the formula for temp stability. Is it an unknown? Is there a way to find this info?
How would you use the FPS / ‘F formula? Let’s say I’m looking to buy a couple different powders to start load development for a new caliber, and I want to be sure I develop something that is fast, but also capable of going from 20 ‘F when I’m doing load development, to 85 ‘F when I’m practicing in the summer, then back down to the 20-50 degree range for hunting season. How do you apply the formula, and is there a way you can use this to help identify a potential ‘no go’ situation, or is it trial and error?