Two days ago I began shooting my .22 using Winchester Power Point 40 gr. hollow points. This ammo normally gives .5 or so groups at 50 yards, like 1 hole that you can put your finger in. I started shooting with a warm rifle & ammo with the usual accuracy. I took a break and every thing cooled down to 30* or so. The fine accuracy went away, flyers some 2-3 inches out. I noticed that there are some types of ammo like Lapua Polar Biathlon, Fiocchi Exacta Biathlon, Lapua Biathlon Xtreme for biathlon events. Is this ammo formulated for cold temps? I checked my rifle out and it performed the same good way when it was warm. Rifle, scope or Ammo?