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kt,
I can't say I have ever hunted in wind chill temps of -15, but I have hunted in some terrible stuff and haven't had a problem with my SBE. Now, the colder it gets, the more velocity is lost because powder burns slower, so there is less recoil to operate a SBE. If I am not mistaken, the 390 is a gas operated gun, and the amount of gas is the same no matter the temperature; however, has pressure might not be. Don;t know the exact answer.
My SBE will not fire light 1 1/8 oz loads when it is in the 40's out. However, it will fire 1 1/8 oz loads at 1,200 fps rather reliably regardless of the temp.
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The pond, waterfowl, and yellow labs...it don't get any better.
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