Blimey! How many shots exactly do you need for a hunting trip...

I have a standard cylinder which achieved around 25 x 11.5 ft/lb shots with single digit consistancy in the 'sweet spot' - this occured from somewhere about 170-160 bar (didn't have gauge fitted at the time) - so filling up beyond 170 bar was just a waste.

I then fitted an internal Altaros regulator - this then allowed me to fill to 190 bar and gives me around 70 x 11.5ft/lb shots before I drop off regulation.

You must be seeing even more than that with a standard cylinder AND an external reg.