Kirrmeister, I think you'll love it. I've owned several of the Pedersoli double 12s over the past few decades and all would shoot a round ball to point of aim from at least one barrel. The best load I found was a .648" ball inside a plastic shotcup over the standard 3 1/4 drams of powder. It's funny that the only time I used shotcups was when shooting ball but it's hard to argue with fist size groups at 50 yards without even a rear sight! All of those guns had fixed chokes, generally modified and full, but I always reamed out the right barrel to just a slight choke of improved cylinder or "skeet-one", which I consider as the most useful for general bird hunting. I'd leave the left barrel full for that occasion when a "long shot" of more than thirty yards was called for. Seldom will the two barrels group balls into exactly the same point of aim but you can generally get both on a dinner plate at fifty yards with just a bit of load adjustment. As a rule of thumb, if barrels are "crossfiring", right barrel to the left and left barrel shooting to the right, reduce the powder charge. If barrels "splay out", right barrels to the right and left barrel to the left, increase powder. If you have to use different loads in each barrel to bring them together, that is not a great handicap. Just carry premeasured powder charges for the right barrel in the right pocket and viceversa.
Enjoy the new toy, I won't be seeing my new double 12 until I get back from centerfire deer season which opens next Saturday. I almost look on centerfire hunting now as just a necessary chore to fill the freezer. I'd rather spend the time playing with my new toy! What a spoiled brat I've become! :haha: