Doug,
I believe the 1100 fps claim is with PBA pellets that are even lighter than the Hobbies. I tried one Raptor (9.9 gr) in mine and it only did 1071 fps, but, taking elevation differences into account, my gun seems to be running a bit slower than others.
With mine, the lighter pellets sprayed all over, up to, and including the Superdomes, which I was surprised to see were the worst with 4 inch groups at 30 yards. Crossing the 15 grain point, the heavier pellets such as Jumbo's, Predators, and Jumbo heavies went into groups 1/3 the size. I noticed the over 15 grain pellets all fit snugly into the breach, and only the Jumbo RS fit snug of the under 15 grain. The Superdomes were the loosest fit. And the velocity extreams of the heavier pellets is about half that of the under 15 grain pellets.
With the new seal installed the velocity extreams have been reduced by about half, plus the Tuna trigger reduced group sizes substantially. As the gun is wearing in and settling down, the Predators have shown to be the best so far in my gun - one ragged hole at 30.
Paul.