I've never had any luck getting a good pattern out of any duplex loads, but that might've had to do with my choke tube. Shotguns can be very fickle when it comes to patterning.
I don't hunt with any shotshell loads without patterning them first, to see how they perform at the distances I intend to hunt.
Paper doesn't lie!!! 
Many years ago I used to reload my own steel shot shells, for goose hunting. I ran across a load combination that called for the use of an Activ hull, which was an all plastic 3". It used a Winchester AA shot cup and BB size shot. I finished up loading a box and took them with me for goose hunting the next morning. I was very impressed with the results as I dropped every goose with 1 shot each and out to 50ish yards.
Despite my new found success, later that day I patterned them at 40 yards. For whatever reason, the pattern looked like the shape of a football.
They were the killing load for geese, but the all plastic Activ hull line went out of business and I had to find another brand of ammo. I ended up shooting some Kent Fast Steel, in BBBs and 3 1/2", which worked out just as good for geese.
My go to turkey shotgun is a Mossberg 500 Turkey Special with a 20" barrel and a 3" chamber.
I killed several turkeys with it, using the fiber optic sights that are on it from the factory. However a few years back, I installed a Sightmark Ultra Sight and will never shoot a shotgun without one. There's nothing like knowing exactly where the center of the pattern is going to hit....right or left handed too.
