10 or 12 years ago, the kids and I attended a series of Redneck Jamborees on the Eastern Shore. This was a gathering of friends at a hunting camp to eat too much food, joke around and shoot some to celebrate early spring and shake off some cabin fever.
During one of these, this question came up. A gong had been set up 30 yards away and I loaded up some 3 buck in the 870 YE 20 I had for the kids.It had the open sighted IC barrel on.
On command, I kept that gong dancing for five fast shots, dropped in a Brenekke, and left the gong with a bit of a dent and reverberating for a rather long time.
No one present expressed any doubts of the efficacy of the 20 for HD.