Since no one wants to try to answer this I can only tell you what I know...

In my smoothbore .62 caliber to load and fire you drop powder first (80 grains in my case) and then an over the powder card. On top of that comes a fiber wad made of cork. You then dump the shot down the barrel (in my case 100 grains of #6 shot) on top of the shot comes an over the shot card. All of this is of course driven down to the bottom of the breech. Cap and fire.

On the modern black powder shotguns like you are talking about, you drop the powder or pellets. On top of that you push a 12 gauge plastic wad down onto the powder charge. This takes the place of the over the powder card and the cork fiber wad in my smoothbore. After dumping your shot into the plastic wad, you then put an over the shot card. This holds all of that in the barrel. With a 209 primer on the back, your all ready to shoot.

From talking to people with the Knight TK2000 shotgun, these things loaded properly will kill turkey out to 45-50 yards, so they do have range. Even more so then some of the modern turkey guns. My smoothbore I limit to 30 yards....

Hope this helped..