Wish this could be more helpful but, a dovetail scope mount won't keep the scope in place for very long with any amount of recoil. It is a weak clamping system and recoil from a shotgun will slide the scope off the dovetail. If you want to scope a shotgun you will need rings that mount direction to the picitinny rail. That is why dovetail mounts are for rimfire only.
You can't fix stupid....however ignorance can be cured through education!