Originally Posted by Scooby
Some of the problem is how different rifles deal with the cold, some rifles are well known for dropping power upto 40fps in extreme temperatures whereas the old Daystate Mk3 used to only vary 3-4fps in extremes.
As Pete says.... I set my Steyr up at home...Gun warm 785 fps. Went through the chrono at 755 fps. By this time the gun had spent a few hours in a gunbag in the car and I had shot half the course. The alloy frame on the Steyr was BLOODY COLD! Checked the gun since my return...gun warm 782 fps.
There is a lot of alloy on the Steyr to chill and affect the power level.