Good for you Charlie! I've always wondered if the BB's were dense enough to use. Seems the newer ones aren't as much copper as the old ones. What are they made of these days?
As for temps and SR7625. I don't have any problems at all with 1oz loads down to -10deg; below that it's an issue. Even below +10 I don't sit my ammo box outside while I shoot. I have 25 at a time in a belt carrier; the rest is inside the car. I shoot pretty low P loads for target also; 1100fps/4700psi. If I shot a lot in the cold I'd raise the velocity and pressure to get a better burn. If you really want to see bad burn, use PB at -25deg. Barrels look like you've been shooting black powder. I always finish up all my cold wx shooting with 1-2 factory target loads through each bbl to clean out the 'soot'...
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