Marc:
I kill many, many ruffed grouse with 3/4 oz., 1150 fps. 20 bore handloads. Early season I load them with lead #8 or 9 later I use plated #7 or 7-1/2. I shoot them out of guns bored cylinder and improved cylinder. If you start pacing off your grouse kills what you'll find at least here in the Lake States is that most are killed at 25 yards or less.
When I shot a 12 bore, 2-1/2" I used either the Vintager loads from Poly-Wad or the RST Maxi-Lite's. You will be glad to be living where you are over the next 4-5 years.
