Does your shotgun have screw-in/out chokes?

If it does, that's about the only way you can load with a plastic wad unit (removing the choke). I shoot two different in-line shotguns with .665 extra-full choke tubes. I pour the powder in WITH the choke still threaded in to keep from getting powder into the fine threads inside the muzzle. Then I remove the choke and complete the loading...wad or wads...shot...over-shot wad. Then screw in the choke.

So loaded, both guns throw near 100-percent patterns at 30 yards.

If your shotgun does not have a screw-in/out choke, then forget about trying to load a plastic shot wad unit. Even stuffing one of the 1/2-inch fiber cushion wads throught he choke will destroy the wad. I hunted with such a gun for several seasons...pushing a .125" card wad in over the powder, followed by three or four of the lubricated felt wads, then another heavy card wad. ON top of that, the shot charge was poured, then topped with an over-shot wad. (Styrofoam over-shot wads seemed to work best.) That gun was one of the old Navy Arms T&T (Turkey & Trap) models...and I took a dozen or more birds with the shotgun and 90-percent patterns.

Hope all of this helps.

Toby Bridges
PigBuster