Originally Posted by RobF
My Walther is gaining 10-15fps at the moment...
Every year i've seen the same thing in comps... in winter low misses can be found on the plates, in summer, high. Doubt it's to do with rangefinding as i'm sure some scopes are like mine which ranges short when it gets warmer.
I agree the power changes with temperature but there's also another factor for the misses, the air density, when is cold is higher and pellet has more resistance in the flight and the opposite with hot weather.