I use an auto rifle for a challenge. I can easily pull out the vision of confluence and be guaranteed a 2.0 k/d if I really wanted but it's more fun to work for those kills with the vanquisher. I have one clip of 22 and I basically have to land at least 17 of those to get a kill whereas a gun like the VOC I can 4-5 headshot get a kill and still have enough for two more kills in the clip. There are some guns I just can't beat with the vanquisher if I start shooting at same time if the opposing player is a good shot. Red death is one of them, it'll drop me like a sack of potatoes before I can get 10 shots into them. Just have to pick your battles