Mine like 2F over 3F. I use a lubed felt wad under the ball, and use .454 instead of the recommended .451 for my Pietta.
I'm looking for sub 2" groups at 25 yards out of mine, and it will do it. If myeyes are having a good day, it will be around 1.5".
My .36 '61 Navy will do about as well...