Most of the factory ammo is watered down ammo since the wimps at the FBI cried that the full load stuff was uncontrollabe and hurt their soft hands. One reason that the 40mm got the nod ,since most of the FBI people could qualify with the high vel 10 ammo. They even had low vel. 10 ammo made to try to make things work out but that did not pan out either.

One thing good about the 10 if you reload, you can always go down to the wimpy 40 velositys and loads if you want........ the 40 will never be a 10.