Auto ain't accurate, especially bump fire type stuff.
I can fire accurate rounds with hits on silhouettes at 600 with irons with a match trigger in the AR. Around a second per shot or less, actually less due to mandatory reloads and such....
Just rattling to rattle, gets old real quick if you aren't accomplishing a thing. Though I'll admit had I the cash and desire for full auto it would be a 22, not a centerfire. Those you can write your name with etc....