RE: Scope on a Mossberg 500 (410)
If you have a 50 yard max shot I do not see the reason for a scope. I would put fiber optic clamp-on sights on your vent rib. They will be easy to see and more than accurate enough for 50 yards. Keep in mind that if 50 yards is your maximum, your average shot will probably be about 30. Open sights would probably be better at such a close range.
A .410 is not legal for deer here in Iowa but I would think that it would be OK if it is legal there in MI. From what I have read, a .410 has quite a bit faster muzzle speed than the larger gauges. Good luck with it.
Bob