Re: Observation about R17 today
It had me scratchin my bundled up head more than once. During the 6 minutes & 23 seconds that the iPhone was functional at -15, it claimed a 62% humidity, 4300 ft elevation, and -17F. Shooter app told me to run the standard dope, & it worked. I fully expected to be putting an extra mil on it past 1k, but ended up running right on most of the day, and putting maybe an extra .3-.5 on for the last stage's 1075 & 1205 targets (made hits on em!) The sun was down by then & we had .7 mils of wind. My trigger finger was beyond numb by then, too, so I could have been jerking things.
I've seen R17 heat up a primer or two at 100F, and definitely do buy into "warm" temp sensitivity, but so far despite a couple conversations with montanamarine about it, I haven't seen much to support a downward track on muzzle velocity in the cold.
I think I should go shoot tomorrow to gather more data before our nice cold snap goes away....