Winchester has (sort-of) copied the PS shell with their own ROOSTER XR load. Like the PS, it has the so-called special wad to hold the shot together. I've fired some of the 2 3/4", 1 1/4 oz. #4s in the field, using the same I/C choke as PS.
These loads have copper-plated lead pellets running 1300 FPS, which are a bit slower than the PS loads tested. Not sure why, but this ammo did not kill the late-season birds as well as the PS ammo did. But, I've had crippling issues with other Win. ammo, especially the SUPER PHEASANT 2 3/4", 1 3/8 oz load running 1450 FPS.
As such, I'll stick with the Fed Wing-Shok or Rem Nitro Pheasant.