Years ago I knew a fellow who deer hunted with an old rusty 12 gauge single-shot using slugs. He had taken J-B Weld and formed a rear sight. He used a triangle file to fine tune a groove in it to get it to shoot slugs to point of aim. I took him to the club range when I went to check that my rifle was still sighed in and he let me shoot 2-3 slugs though his shotgun at a 100 yard target. I was amazed how well it shot.
