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20-30 is nothing. Worry about it when it's -30 and the oil starts to gum up and affect function. Both of those will work fine. I frequently hunt in much colder weather than 20-30, and I also hike in the winter with my 637 snubby. The other day it warmed up to 18 when I was getting back to the truck. I didn't fire more than a cylinder full, plinking, but no worries. Squeeze the trigger and it goes bang. Glocks, XDs, etc. have all gone with me on cold days. Wipe it down and get her ready for the next outing. I've never seen any of my firearms accumulate a significant amount of moisture unless it's snowing or raining on them directly. Of course, I'm in NM, so it's a tad drier out here.
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