Punching holes in paper and tin cans that don't shoot back is just not the same.
Noise, pressure lack of sleep ect all effect you.
The training must be so natural that it is like pointing your finger you just do it. 1. acquire the target center mass. ( that is center of what you can see)2. hit target center mass 3.hit it again move to to next one . There is good reason they are setup with 3 round burst.
Unless your on the SAW then 3-6 round burst to keep them in place and give the rifleman a chance to kill them.
better yet the 203 makes it easy on all of you if your lucky. Better yet call for fire and duck.