So, the whities have pretty well destroyed my 20 yard target and started working on the 30. I figured out why I'm having this problem: Usually I make my targets out of grass hay; last year I used bales from an alfalfa field. So, I made my targets out of deer candy. Duh.
Yesterday morning I looked out and three does were chewing on the 30 yard target butt, and two more were actually bedded down in the resulting pile of hay. I ran them off with a sling shot, and the little devil on my shoulder told me to start shopping for some LARP arrows...but nah, as fun as that would be, the neighbors wouldn't understand, and explaining it to the game warden would be more trouble than it's worth.