Powder Temperature Stability

[prm]

Ran across an interesting tidbit while watching a Hornady video on their 4Dof ballistic software. In the software you can make notes for each load and in that select a powder. They have evidently tested powders on a variety of cartridges and temps from very cold to very hot and at 70deg. It then gives you a measurement of how many fps are lost or gained per degree of temp from 70. Data matches the trends I see on the powders I’ve sampled in room temp and than at ~10 deg. If they keep building the database I think it will be a great reference.

 

[Gargoyle]

Only app that let me make first round hits at a mile.

 

[eoperator]

4dof all default info except changing environment temp to 0deg
mv2600
h4350 2549
h4831 2558
h1000 2568
varget 2589
retumbo 2589
r16 2592
r22 2561
r26 2573

Unless I am doing something wrong that info says r22 is more temp stable than h4350 & h4831, r26 is better than h1000. I wouldn't bet the farm on that data.

 

[35WhelenAI]

RL22 has a history as one of the worst. Literally next to last in stability in this list.

 

[prm]

It does list a lower value for RL22. Be a good question for Hornady.

I have tested RL26, Varget, and RL16 from that list. Those numbers, and relative position, essentially match what I saw.