Actually if I am hunting in thick cover and know the shots will be close, I think a roundball is one of the most effective projectiles a person can use on deer. At the closer ranges, they have great speed on them and then to really flatten out when they hit. Most impressive is some of the entrance wounds I have seen roundballs make. You would swear someone threw a golf ball through the deer until you turn them over and see the exit wound. Also the internal damage a simple roundball will do is massive.