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.
Creed Battery f/s
Creed Replacement eyes f/s
Creed replacement solenoid f/s
06 alien remains board f/s