I feel like the requirement for the empty magazine is actually a handicap for a high capacity weapon compared to Feeding Frenzy, which you can have a little more control over, provided there are adds handy. Who's Next doesn't belong on anything like an auto or pulse rifle, and Cascade is misplaced outside of shotguns. Maybe it could work as a pressure reliever on a hand cannon or scout if a mob creeps up on you just before you can reload.