Has anyone experienced an increase in group size when the temperature drops?  When it was in the upper 30's I was getting around 1/2" 5 shot groups at 90 yds. with my 32-20 BS'd.  Since it dropped into the lower to mid teens I've been lucky just to shoot into an inch, usually more like 1 1/2".  Maybe I don't have enough Canadian in me.

JS

I'm using White Label 50-50 lube which doesn't seem to get too hard at lower temps, at least what I consider to be lower temps.  I must be having some other problem.  What in the world are you doing shooting at -40???  I have several friends in the Yukon and they seem to shrug off -40 but I sure can't do it.

JS

You have to have the trigger set at 8 ounces or more, otherwise you cannot feel the trigger.

We shoot every month through the winter so we are ready to be competitive with the Americans in the spring. And those Californians practice all winter long.
Really you guys should give us Canadians a handicap.

I was a forester and worked outside all winter long with logging operations. You learn how adapt to the weather conditions. 

So far I have caught 35 rainbow trout ice fishing this winter. Never have liked working or playing indoors.

And minus 60 does not feel any colder than minus 40.
Gets to a point where it doesn't matter. Your body climatizes. However I cannot get use to the heat in the Southern States.

It is not too cold until your rye whiskey freezes.

I figured out that my problem was caused by heat waves coming off the barrel along with the resulting mirage.  The attached photo shows it pretty well.  The "pattern" in the center was foulers shot with cull bullets.  The two on the right were shot trying to peer through the mirage.  I plugged in a small fan to blow a breeze across the barrel.  Things cleared right up and I shot the center top group which was how the rifle was shooting in warm weather.  The bulls are 1 3/16" in diameter and the group is about 3/8".  If I hadn't dropped the last shot it would have been a decent group.  I guess the moral is, if you're going to shoot in cool weather you'd better have some wind.  10 kph at -60 would be about right for the Canadians.

JS