There are also subsonic AA loads as well as those from B&P, although since their acquisition by Fiocchi it seems availability is not as great in the U.S. as their former importer. I hope that will change. For instance, I don't see any 16 gauge shells at their U.S. website. At least B&P publishes pressure curves on their Italian site. Their 7/8 ounce sub-sound loads are 5800 psi, 1 ounce sub-sound 6100 psi. Unfortunately, the U.S. website does not seem to list the sub-sound, but one variant of the 7/8 ounce Competition One shells run 7250 psi according to the Italian website.
https://www.baschieri-pellagri.com/...da+tiro/trap-skeet+training/1/index.aspx