<quote>UPDATE: I just finished some test loads in old style AA cases with 18gr Red Dot and F209 primers.
FC1 + .125 20ga card + .680 RB perfect fold crimp
WWAA12F114 + .125 20ga card + .680 RB perfect fold crimp
FS3 + 1/8" felt 20ga filler wad + .680 RB perfect fold crimp
FS3 + 2 12ga OS wads + .680 RB perfect fold crimp
The FC1 and WWAA12F114 (yellow) seem to be just about ideal in the old style (compression formed) AA cases. The 18gr Red Dot was just to start, and I'm sure that more volume of powder can be added and still get a good crimp. I need to see if these will survive going down the smooth and rifled bores before getting to carried away.<quote>
I shot the above loads in both the rifled 870 and 20" smooth double. The FC1 wads didn't survive the ordeal from either barrel. The WWAA12F114 survived, but didn't group well from either. The FS3 sounded hollow and didn't group well either.
Judging from the rifling marks on the yellow Winchester wads, I would say they were too LOOSE for the rifled 870.