You don't need a new gun or less shot. Just let them rise, then only take the tough shots. This time of year the birds ought to be running and good shots should few and far between anyway. Another way is to knock of earlier in the day. The birds don't start bunching up again until close to sun down when they are covying up to bed down. Instead of breaking up covies, I always used the end of the day to retrace my steps to where I think I might have wounded a bird that is unlikely to last the night. A wounded bird will start calling for help toward the end of the day.