I am saving my nickels and plan on buying an Impact in the next month or so. I will be ordering it in .25, but my power question is sort of odd. Does anyone have an impact with the .177 barrel and if so, can you shoot around 12 foot pounds without adjusting the reg? I ask this because I need to shoot Starlings indoors and would like to be able to have the .177 barrel for that and later on in the day swap to the .25 barrel and pop ground hogs at 100 yards with the turn of a few knobs. If I have to adjust the reg, its no big deal, but it would be nice if I didn't have to.