See, I use Med caps (80Rnd) and I will still happily empty the clip into someone if they don't take it.
Actually, Semi only doesn't really work for me as i can fire my M4 faster on semi than I can on full.
Back on topic, just ordered 6k from gunfire.pl. In a 2 hour game, I can either get through 5 x MedCaps and a 300Rnd Hi, or I'll use a couple of Meds. It depends on the other team, what game we're playing and such.