It works for a few shots but not for a 100!
I have used it successfully when helpding boyscouts meet the minimum requiremetn for the shotgun badge. Some boys (despite age) can't hold the SG for 50 shots and when they are one or two shots from failing the test, I have asked thme to visualize the target and to get mad at it and really want to hit it. It works all the time but only as a last resort. One kid told me he pictured a school bully he hated, then he nailed the taget after about 20 straight misses.. While not entirely scout like, it worked for him. Yes, i did tell him gun violence is not a good thing!