Quote Originally Posted by Shed tuner View Post
with springers, 99% of temperature related velocity change is down to seal fit / friction.
I've seen some extreme changes in the winter temperatures we used to get here. Accidentally left a .177 HW95 in the car trunk over night some years back, with temeperature below -20 degrees C. It chronographed very high until it warmed up.

Was meaning to do some experiements this winter, but we didnt get any extreme low temperatures that lasted.
The idea was to test the FWB300s with its steel rings, as they should not be as affected by temperature as plastic/synthetic seals.