RE: simmons bp scope?
Specialty Scopes
Specialty scopes for shotguns and muzzleloaders typically have extra-long eye relief (more than 4 inches) so you can mount them well forward. Cantilever mounts on shotgun barrels work well with scopes of this type. So do black powder rifles that require easy access to firing mechanisms that lie under ocular bells of ordinary scopes. A bold, thick reticle is standard on shotgun/muzzleloader scopes because it’s easy to see, and there’s no need for great precision when hunting big game at modest ranges. Scopes for turkey hunting commonly feature a circle in combination with a plex reticle. The circle, typically subtending 30 inches at 40 yards, can be used as a rangefinder.