Just after I thought I had my load all worked out for my .30-06, I thought I better check it in cooler weather, it was 26 deg this morning!
Going from 60 deg. F to 29 deg I went from 2900 fps to 2770 using RL17! That's too much for a powder I thought was supposed to be good in various temps. Is anyone else seeing the same thing - or did I just have a bad day? JB had similar or worse results with I4350, so I am not inclined to go that route, I didn't get the velocity I was looking for with H4350, and the accuracy wasn't great with Big Game (and I don't think BG is that temp stable either - anyone tested it?)
By contrast my .338 Fed went from 2775 to 2735 in the same temps using I8208 not great but I can live with that.
Thoughts from anyone else that has actually done some cold weather testing?
