Um.. you CAN engineer a load that duplicates black powder velocity and pressure, or nearly duplicates it, and many here do just that. BUT to assume a smokeless load that produces 1100fps has the same pressure as black is really dangerous thinking. It's only so if that was the loading objective, the powder selection and charge is correct, and the loads have been tested to meet the objective.

"The price of good shotgunnery is constant practice" - Fred Kimble