Very interesting. When I tried to duplicate the Buffalo Bore ammo for more economical practice, I was not able to get past the mid 900s out of a 2" barrel with the 100g XTP and AA#5. (I admit that I do not ordinarily go beyond published reloading tables.) The closest I ever got to 1100fps was with Lil Gun, but encountered very strange velocity variations and decided not to continue with that powder. I have given up trying to duplicate the BB load, and just shoot a few of the expensive rounds occasionally to remember what they feel like.