I used a rifled slug barel with iron sights on My Mossberg500 for years (till the eyes went bad)
at the range, I sighted in 1" high at 50 yards.
I could group 3" at 70 yards, and keep them on a 8" plate at 95 yards.

I did take a deer with 1 shot from a climber at 90 yards, most hunting kills where 20-70 yards.

Loved the simplicity and dead on (nother to bump out) never had to worry about it.

Slack