mitch,
I've seen on one of the 'training films', possibly by Bill Jordan, where a doe was knocked over by a slug -- but probably because it was hit in the back bone or the shoulder. The 12 ga' slugs are a good diameter, as we all know, being about .70 caliber to start with. But they don't stop the deer all that well.
I have a couple of cousins who can shoot with the best of them -- quickly and accurately. One of them put three Brenneke's into a buck some years ago in short order and he kept on moving for a little bit. They got him out of the woods, but it was surprising that he could even stand after the way the first one hit him. But those all-lead slugs do that often. The same cousin drilled a doe with one or two slugs out of a very expensive Browning Gold, and she went a Long Way before dying. She went Hundreds of yards before they found her!
I think that unless we use a compromise, jacketed-type of projectile out of a slug-shooter that we are handicapped in the state of Ohio.
Take care, and good luck again,
SS'