Alright, got my sizer die, and some paper that worked. Still using some poorly made boolits though, as I have no mold right now. Over 35g of #9 I had:
7 or so rds w/ the right paper, 3 wild fliers, 3 in a cloverleaf shaped hole, and one an inch or so away from the cloverleaf. Incidentally, shooting conditions were very poor, so the 1 shot could have been my mistake as well. The 3 outlyers were several inches away from the group and point of aim in random directions.
6 more with the right paper had 3 wild fliers and 3 in a 1.5 inch group.
Using some slightly thicker paper sized down to .377, I couldn't find my shots w/ 3 rds, but had no problem hitting a 28" gong at 100yds in the area I was shooting at. Can't really say what the issue is with these, no leading that I can see.
Getting 3 rds cutting the same hole seems promising, If I could figure out what the fliers were from. It would be nice to start again with some well cast cores, but that will have to wait for a mold. I got ahold of some good paper, but only enough for 100 or so rounds. I guess this project is on hold 'til I get a mold again. Will try bare boolits at that point as well, especially now that the bore is smoothed out a bit.