I'm going to say you should probably get about 140-160 shots of of the 13ci/3000 tank. That's if you don't waste a bunch at the chrony first. You could probably gain a bit by using a tight bore and running your velocity a bit on the low side......say 270ish.
This is based on the numbers others have posted here.
CCI stock class Phantom pump f/s. This thing is LNIB. Comes with stock magazine, extended magazine, barrel detent kit, crossfire lite up dot sight, velocity adjustment tool, 12 tubes even the barrel blocker
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S