Outside of shotguns, it's rare for me to put less then 50 rounds thru a gun I take to the range.
It's also rare for me to put more then 200 down any single gun in a day.
I'd say 100 is about avg, maybe 150
I would not shoot more thru the gun just causes it's the first time at the range.. just treat it like a normal range session, you really luv'n it and wanna shoot more then usual that's ok, but I would not turn it into "work" trying to hit a arbitrary round count.