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Not as good as either of the Hodgdon Extreme Powders mentioned. It is temperature sensitive and my experience with it in 300 Win Mag and 7mm Rem Mag was it burns dirty compared to either of the Hodgdon powders mentioned. I like Retumbo better than H 1000.
What's a good temp to develop these loads? 0-50 degrees and then 50 plus ?
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What many fail to realize is a rifle shoots best at certain velocities or "barrel nodes". So the best thing to do with temp sensitive powder is find a node and add or take away from the charge according to the temps you'll be shooting in.
For instance when I used to use R-17 I had 3 loads, summer, spring/fall and winter. Your only talking about .4 grains difference from the heat of summer to the cold of winter for a medium capacity case but the velocity was the same and in the node. Kind of a PITA but it works and solves the problem.