Last summer I came up with a Green Mountain drop-in barrel for a TC in 62 caliber smoothbore (same as a 20 gauge). I mounted it on a Renegade and did a fair bit of shooting with patched round balls. But recently I took off the rear sight and went to work at the pattern board with shot loads.
Holy cow! With my load (80 grains of Goex 2f and the same measure full of #6 shot, with a lubed Type A wad between them and a nicked overshot card) it yielded unbelievably smooth and dense patterns at 25 yards, in spite of no chokes.
Today I took it out for snowshoe hare, and I was selling it really short in patterning at 25 yards. The hares weren't holding and I was forced to take running shots at around 35 yards, and absolutely rolled both I shot at. Dressing showed one with 3 pellets in the body and the other with 5. Can't beat that, but I doubt I'd use it that far for ptarmigan and expect to connect regularly.
I'm headed back to the range ASAP to do some patterning at closer ranges and on out at 30, 35 and 40 yards just to get better acquainted with it. I'm sure the pattern is too dense at 25 and closer for dead-on holds, so I need to know where the edge is at closer ranges so I can fringe them and cut down on hits.
Just thought folks would like to know!