About a month ago I was shooting my 10g (smooth bore 24 1/2" H&R, no sights I just look down the barrel) and there were a couple of guys shooting a steel deer at 200yards practicing for stalking. We joked about me being able to hit it, so I took a shot, and BANG ! the steel rang loud and nearly fell over. I was surprised.
I normally only shoot it at 25 meters, so took it to the 100yard range, took a shot with my .308 to get my eye in, then a few 10g shots. The accuracy was spot on.
The hole from the 10, it a liiiitle bit bigger than the .308