Hey John, how's it going? Check out
www.16ga.com -- lots of good info.
I shoot a 16 gauge Damascus Parker GH and have used the following load a lot for both clays and live birds:
16.3 grs of Unique under 7/8 oz of #8s
I'm using new pre-primed Fiocchi hulls trimmed to 2 1/2” and Ballistic Products "Sporting 16" wads loaded on a PW 375
According to published data this loads runs at 7800 psi