STEN,
Do yourself some tests!
When I started to use H335 in my 45/70, some folk said I'd be having hang fires and other problems with this powder in cool/cold weather.
Hmmmmm, it shot better then any of the other powders I was using, so I loaded up 10 and placed them in the freezer for about a week or a tad more.
Then, during a early morning test session, I removed the frozen ammo from the freezer, packed it in ice paks in a small cooler and headed to the range.
I set up the bench and chronograph, got the targets in place, then removed the cartridges one at a time from the ice and fired for group and velocity.
The group was very compairable to non-frozen ammo and the velocity was less then 50fps lower.
So, I put the subject to rest and went hunting, also had no more questions raised about H335 after putting the test info on the forums.
So, a test isn't all that hard to do, give it a go.
Crusty Deary Ol'Coot
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