I have had good success with the Universal (Winchester), Federal/Estate hulls, as well as the 6 and 8 crimp Remington Gun Club. I load all of them once and let them fly as they are so abundant. I have good success with Herco (17gr.) Rem. Power Piston wad and 7/8 oz. shot. Also 14 grs. of Green Dot works well also. FD
I use the Remington Game hulls in both 12 and 20 ga. The 20 ga works fine with my load of 16.0 Universal, RXP20 wad, Nobel Sports primer, and 7/8 oz shot. They also work fine with Orange Duster, Rem 209P primer, and 16.5 gr Unique (also 7/8 oz shot).
My Hodgdon manual states that Remington RXP, Premier, and STS shells ca all be reloaded the same. I would say that it encompasses the Gunclub hull as well. It looks like all of the 20ga hulls that Remington makes.
I load a lot of 20's for hunting and a little skeet. The hulls you first mentioned will all work but I would use once and pitch. I love STS 20's and usually load 1oz. with them to ID. them. The old AA are great and a small adjustment may be necessary for you to load the new AA's. I am lucky to be well blessed with thousands of the last two. If you need to try some call me. The Gun Clubs will load the same as the Rems. Good luck. RIP
One of the Remington cases of which you speak is marked "Remington High Velocity."
It is a ribbed case and if you cut it you will find it is compression formed, no base wad. I load this case with Unique and there is data in in the manual that specifies you can use the same receipe as in the STS since it is a "compression formed case." I have loaded these cases several times with no problem except they work a little hard at at the deprime/rezize station in my 600 jr. Also you need a 6 point crimp starter.
ec90t, you may want to do some shooting with your little SxS before stocking up on too much ammo. I have a light little 20 BSS that will kick the heck out of me with anything even approaching a heavy load. I shoot it in competition sometimes & always use a light 3/4 oz load when I do so. A light weight SxS is just a different critter when it comes to recoil....good luck!
The recoil of the 7/8oz load wasn't bothersome at all. The gun wears a plastic butt plate and a curved stock. I'm going to drop the gun off tonight to cure that problem.
The only time that the recoil got my attention was when the gun doubled. I pulled the back trigger first on one station because The first bird was a farther shot. That problem will also be addressed when I drop the gun off.
As far as shells, I also have a bps 20ga. It gets to shoot the heavier shells. It handles the 3" shells and the 2 3/4" 1oz loads well.