Depends on what you are using the shells for I guess. Most .410 single shots are choked full. That tiny pattern isn't very effective far out even with a full choke, so a few people prefer more open chokes. I would say pattern your gun with a factory load and see if you like it. Most factory .410 is probably either soft dropped shot or chilled lead. If you want a tighter pattern, use harder shot. If you want a more open patter, use soft drop shot.
The argument I've heard is that with a .410, within it's effective range, you stand a better chance of connecting with a more open choke. Beyond a certain range a full choke pattern is too hard to hit with and an open pattern is too open. Go to the patterning boards and see if you think you need a tighter pattern before going to premium shots, I would recomend. On the other hand, if you want a really tight pattern, go for the hard shot. You use so little in a .410 it won't cost a whole lot to try, especially if you can get a 5lb jar from Midway USA.
