Cold Trigger Finger, hot dog man, it sounds like your in business and getting serious. Your Chronny did good at that temp, and at 18' the mv is pretty good for a starting load. I had a pro-staff on my slug gun. Absoultely beautiful scope, but the recoil of the beast killed it. On the CM it should be great. How cold is it getting when the sun goes down? I'm making the assumption that your shooting at mid day.
I passed up a used Ruger M77 Mark II in 260 Rem last for $400. Lot's of cooper fouling at the muzzle. Makes me wonder if the previous owner shot it till they wobbled all over the place and got tired of it. Very pretty gun with a VX2 3-9, may go back today and snatch it up and hope it shoots straight. To make matters worst, it fit me perfectly. I think I'' have to pass on it.
Two rifles in the closet is more than I can shoot at once as it is. To add a third? And,(never start a sentence with a conjunction) if it turned out to be a supressive fire weapon, I'd not be very happy, nor would I feel good selling it to someone else in that condition. The wood and bluing were perfect
Stay warm up there.