Can't offer a comparison between them but I got 150fps more from RL17 than the IMR powder I was using. 200gr ELD x in my wsm. I haven't used it in extreme conditions yet but going from using it in the heat 25c to cool overcast conditions I haven't noticed any difference. I intend to chase some chamois over the winter months if we are allowed. Be interesting to see any change in performance.
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