used hill pump to fill an air arms 200 for 11 years without any problems, before selling said rifle i stripped and serviced it down to the last part and after many thousands of shots fired and countless first class hunts the inside of my rifle were as new. based on that and a previous incident whereby my rifle had been damaged by moisture ingress from a dive bottle i would;nt be too quick to switch back to a bottle; It has to be said that i would,nt recommend using a pump if you have a heart condition or similar i am 50 years old and lets say a little stout but so long as care is taken with