Is either the pumper or the spring piston rifle much affected by temperature changes, or cold weather?
Really only the CO2 guns are affected by the weather. It won't be much of an issue with a multi pump or springer.
I'll go along with the other guys in recommending the R9 and 392/397 Benjamin rifles. The R9 is a great little rifle and fairly quick for followup shots, but the Benjamin pumps are easy on scope and can be kept loaded for years with no affect on the rifle (unlike spring guns). I have examples of both but currently shoot the Benjamins more than my R9.
