Can someone explain/answer my problem posted in deer slugs in versamax?

The VM's shotgun fitted with a over-bored barrel was never intended to shoot slugs out of. It was designed for heavy doses of steel shot for waterfowl hunters.
Using two beads on a shotgun as sights to place slugs in a bulls-eye is useless as well.
You will definitely get better results with a scope or red dot aiming device on the original barrel, but in my opinion the best option is to purchase a rifled barrel and add a receiver mounted scope, especially if you live in a area that forces you to have to use a shotgun instead of a centerfire rifle to deer hunt with.

Here is what i am talking about....

http://www.cheaperthandirt.com/product/7-R80620