I do use Winchester #5s in my 20 ga. 35 yard range if needed.
But will stick with Winchester #4 in my 12.
Don't need to screw with what works!
Besides....
All I need is a round that patterns well less than 20 yards. My current yard average for all the birds I have harvested is 22!.
20 or less is the way I hunt. My preference only.
JW