Rikky Lee, I notice the "ripping noise" year around. Basically sea level, temperatures maybe 0 to 70 Fahrenheit (around -20 to +20 Celsius). Fortunately also muzzle velocities are a bit lower in wintertime.
My biggest annoyance is that I've not found slow enough and cheap enough training ammo for 22LR. I just looked at my notes and the ammo I'm currently using (Eley Std) was averaging 1040fps in +20C/70F. CCI Std is pushing 1080+ fps. Other std vel are between them.
The difference from RWS subsonic (975fps) to Eley is significant but still tolerable. CCI I use only in pistol. RWS is damn expensive. I ought to gather some different ammo and have a chronograph session with my new Anshcutz full-size trainer (old bolt action biathlon rifle).
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