How did it pattern at longer ranges... 50 yards and beyond? Did all the shot fit in the wad? I would guess it did if they were 3.5" wads. Imo no wads or short wads and lomg range patterns dont hold up.
My guess is if the OP is loading 3" 12 gauge hes going to find out most wads tje stack height is 2oz max without overflowing. Sure you can fill it above the wad but imo your wasting shot. He will find out real quick lighter payloads will pattern tighter and at alot longer ranges.
If ypur max range is under 25 yards...closer to 20 yards then youll see more hits on paper
Farther and the overflowing massive payloads blow. A 2oz load at 40 yards will put times more pellets in a 10" circle for me vs a 3oz load. My 2
5 oz load looks like a window screen at 40 yards.