CAT...here's my stuff I've been using. Comes from Hodgdon's web site. The lowest pressure loads shown use the Win lightning style wads. I use all Clay Buster wads now...have been for yrs. These are the loads I use for the grand son's when they want to shoot my 12 ga Browning 625
1 oz- shot...Win AAHS....W-209....Hi Gun...16.1 grains...CB 4100-12B (win lightning clone)..1180 fps and 6400 PSI (kids)
1 oz- shot...Rem GC, STS, Nitro...W-209...Hi Gun....16.2 grains...CB-4100-12B ....... 1180 fps and 7000 PSI (kids)
~~~all the same as above...swap wads...................16.0 grains...CB 8100-12 (TGT 12) ........1180 fps and 7700 PSI
~~~~~~~~~~~~~~~~~~~~~~~~~~ 16.3 grains...CB 1100-12 (WAA-12SL) ....1180 fps and 8100 PSI
Easily seen that just a wad change can add more pressure to basically the same loads.
I also load a fair bit of 1300 fps stuff for my SIL...he's using a Maxus semi...and they work flawlessly in that. Even my 1325 fps 7/8 oz stuff cycles 100 % of the time in it.
***** get yourself a cheap box of cheerios and add 2 to each wad prior to shot dump...stack height will be perfect ! For sweeter smelling shells use fruit loops...lmao
Word of caution...when adding the "stack height adjustments"...don't force your drop tube down into the cheerios and plug off the drop tube...just sayin for a friend
Hope this is of some use to you...cheers...Kevin