When that buck steps out at 20 -30 yds, it'll seem like a chip shot compared to how you've been practicing. Give it try and see if it works for you.
For me anyways, when I get in that "chip shot" frame of mind, I don't do so well. I try to take no shot for granted and try to put the same level of concentration into a 2 yard as a 60 yard shot.
I do agree though that practicing beyond your limit is good and should be part of a good practice routine.