I don't know what velocity it was designed for but 3 pellets of triple7 or 120 of loose triple7 for me works just fine. I don't notice much more recoil, but then again I don't mind recoil. The only time you will notice the recoil is on the bench, in the field you would even remember it.
I would not get rid of mine and now my buddy has one on his Encore. We use the T/C Bonded shock wave 250 gr. bullets in our's.