Quote:
Originally Posted by Paul Harm
Might be wrong, but don't think Promo or Select are slow burning powders. And, they had been in the heated club house, went in my shooting coat pocket, and the 5-stand is enclosed but not heated. Anyways, tonight I'm going over for a meeting and will step out and try the 700X, Nitro, and the two hotter loads after they sit out for 10 or 15 minutes.
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Paul all 12ga target load powders are on the fast side on the burn rate chart. Of the four you mentioned Nitro100 is the fastest. Promo is the same as Red Dot, fast, and American Select a notch slower (better for 12ga 1 1/8 ounce) and close to Green Dot.
What you haven't told us is what the published pressures of your reloads are and that is the most critical aspect of cold weather loads. If you are shooting sub 8000 psi in very cold weather it invites problems. If you search around with Google most advice is use a hot primer like the 209A and get your pressures in the 10,000 range.
Increasing the pressure could be change the primer, increase the powder charge or shoot a heavier load.
You never see people shooting the promotional four pack loadings of Federal or Winchester having a problem in cold weather, they are high pressure loads.
Of course in a few years Global Warming will make it so none of us have to worry about cold weather shooting
Until then there is point where I stop working in real cold weather before the shells give me a problem.