well said Jitspoe
but I wouldnt limit on the guns, but rather on the hoppers and bottles (yes, reduce the loads even more!)
cuz if u cannot shoot more than 50 shots due to limitations on hoppers/co2 bottles you won't go lining important spots for minutes (as in Siege Castle) or go spraying the middle (as in Sandtrap and Paintball Cliffs)
So what i did on my newest map was to exclude hoppers and co2 bottles completely, making each player have to think before he shoots.
MfG