Tony I thought it was 30 shots in .22 and 20 in .177 which would mean if you get 3 or 4 stops at an HFT comp your getting up to one third over the shot count... have you found this not to be the case?
I was speaking to Matt Lowe the works manager for Brocock at the Airgun expo WHFTA and he said they would be looking at a slightly larger bottle version to increase the count in the not too distant future. I was holding out for this for my boy.
*edit*
This from BAR on the shot count
Length 69cm
Weight 1.7kg
Shots per charge 20 shots in .177cal 25 shots in .22cal