Pheasant shot varies depending on who you talk to...
I use (or used when lead was still legal) called Fiocchi Golden Pheasant... These are nickle-plated #6's, #5's, or #4's... They come in 2 3/4" or 3" loads in both 12 ga., and 20 ga... When I shot lead at turkeys it was these loads. They pattern very well in both the 20 ga. and 12 ga.
Currently in California it is a non-issue as we can no longer shoot lead at most game (including turkey or pheasant).