but a smaller 3 d target and you get the same effect as you do at shooting thos edistances without having so far to walk and get your arrows.the same pricipals used in marine corps shooting.
Not even close to being the same thing.
At 20 yards you don't have the effect of wind, the arch of the arrow, the slowing speedof the arrow, the higher level of concnetration, and a host of other contributing factors.
Trust me when i tell you that the marines, army, or anyone else wanting to be accurate at extended ranges doesn't simply shoot at a smaller 100 yard target. Quite the oposite. They practice regularly at 600, 800, 1000 yards.
The only way to be proficient at extended ranges is to practice at those ranges. No one is saying that anyone has to shoot deer at extended ranges but practicing at those distances does make a shooter much more effective at shorter distances.
Also not everyone hunts in thick woodswhere a 20 yard shot is a long one. Go out west and hunt elk, mulies, sheep, or antelope and you had better be able to shoot to 50 yards accurately or you may eat a whole lot of tag soup.