OK. That didn't take too long. I shot it this past Sunday after taking a nice buck with my bow the day before Thanksgiving (after spending every spare daytime minute in the woods).
I shot 4 boxes of Remington Copper Solid Sabots. Ended up an inch high at 50 yards and about 8 inches low at 100! The left barrel consistently impacts about 4 inches to the left of the right at 50 yards. My farm doesn't offer many shots longer than 50 yards, so I'm not too worried about what happens at 100 yards, at least for now.
The recoil is... substantial, but I have shot worse and don't plan to shoot 20 rounds at a time very often. No shoulder bruises the next day, BTW. It caused a bit of a stir at the range - no one had seen anything quite like it and I still find it very handsome except for that strap by the muzzles.
We are smack in the middle of Ohio's gun season but the weather is most unpleasant. I may try to shoot a doe with it, but the whole process has made me realize I like bowhunting whitetails much better than shotgun hunting.
I am looking forward to my RBL 12, though. I enjoy clays even though I'm mediocre at best.