[Case]

Skt/Skt or a combination of Skeet and Improved Cylinder should work well. I/C and Modified (for Stations 3, 4 and 5) might work well also.

With any two or combination of those you should be able to break any target on the range as well as you could with an actual .410 -- maybe easier -- since the difference in bore sizes is approaching negligible.

I can even break most targets with the 12-410 Chambermates, but the pattern pretty much falls apart on targets at a full 21 yards or more.