RL17 is known to be tempture sensitive. My loads change in the summertime.I don’t know how temp sensitive that powder is but if it’s only 19 degrees I’d be real careful loading anything close to a sticky bolt. I loaded some rl17 in a 284 and was getting great groups and no pressure signs around 65 degrees. Fired a couple at 95 degrees and the second one blew the primer straight out of the brass and the bolt was very hard to open. This was just slightly above max.