If you can hit something the size of a soda can at 20 or 30 yards that is accurate enough to kill a deer. That being said, shooting arrows into a metal can probably isn't the best thing you can do for them. And another thing is that when practicing the smaller the target you aim at the more accurate you are usually.

For hunting though it really pays to get some sort of 3-D target or a target with a picture of a deer. That way you can get used to aiming at an animal, not a dot. Accuracy is good, but you really need to learn proper shot placement as well. And shooting at a live animal or 3-D target is a bit tougher than shooting a regular target.

Paul