I have an Air Arms S410 carbine and I was wondering if anyone has information on the power curve.

I pump it up to 190bar, then take SIX "dry shots" to get it into the right part of the curve (AT A GUESS!!). Then it's load up time and off into the field.

As I do not have a chrono at the moment I am wondering if I am doing the right thing. Any advice please would be welcome.

I usually repump when the pressure reaches 150Bar. What pressure can I let it get down to before I need to repump?
The gun was second hand and the pamphlet that comes with it is next to useless (AND it was the original pamphlet!!)

Many thanks.