I've shot quite a bit of hevi through those chokes and know a couple others that have as well w/o a problem. It was a very good choke with the 3.5" 1-3/4oz H13 #6 Green shells. Some found those shells to be terrible, but the SF and those shells in one of my 870SMs hovered around 200 consistently and handled several toms with authority.
If you have any doubts, don't use it with hevi.