Well, did some more shooting yesterday yet have more to do when I get some more powder - getting low on 2F. I did try some 1F GOEX loads, to 120gr. I had resonable accuracy form each barrel, but the points of impact spread vertically by a good 3" - not good.
The 2f load of 100gr. along with a .022" patch and the small .562" ball loaded very easily, of course, but did open the groups from the previous per-barrel grouping of 82gr.(3drams)

I need to try some tighter patches and do some 3F testing. The only tests I did do with 3F wa the 3 dram load, which gas-cut the patches. This is due to the higher or faster generated pressure that 3f produces. It will take a better, "read thicker" patch to contain the added pressure.

With all other powder charges tried using 2f and 2f, the spent patches were re-usable, yet the combination of ball size and patch thickness x 2 barely makes it to the bottom of the grooves. Some compression in the bottom of the grooves is necessary with higher pressure loads - which is normal.

The offhand shots were the last 2 of the day - after firing about 40 shots per tube. I held a tich low of centre for the first shot being the higher shooting right barrel, then in the middle of the target for the left. As noted, these were shot at 56 yards according to the range finder, actually the same 56 yard range as the first target I posted as 50 yards, as the target butts were frozen into the ground and were not moveable.

The offhand target shows a slight right drift and I may have to move the sights to compensate. Both offhand shots felt 'perfectly' centred. More offhand and hunting position shooting will be needed before any sight movement is done, of course.

I guess it's useable for a deer and black bear hunting rifle.