I got 156 from my 1187 20 with a 26" barrel and the Hevi tube with Hevi 7's....it is a 572 constriction so it may shoot very well in my 870 youth as well. I may give it a try when I get my gun back from the dipper.
Don't bother to put any Feds through it though....it is terrible, I tried it just for giggles and it stunk bad.