I always take 1 of my weatherbys in 270 243 or 7mm......And I always take my T/C venture in 30-06 if there is any rain or snow in the forecast...And a 357mag or 44mag on my hip.
I am pretty sure if there is powder involved it is longer an air gun and a permit well be required......I don't believe there is such a gun but I could be wrong.