Rifle sights with slugs are very good.
Aperture, enlarged , like a mini ghost ring work very good too.
Lasers work.
I am the odd man out around here.
What is one going to do with a shotgun?
What is the environment(s) a shotgun is going to used in?
Experience, level of skill of user?
Physical attributes of user?
[Young with great eyes, or wimpy eyes?
Older with failing eyes?
Any injuries limiting shooting?]
I like to shoot moving targets. I have my druthers on shotguns, how set up and loadngs.
. I also have practiced shooting from the bed of a moving p/u truck.
This replicates having to extract a person down, a stalled vehicle, arriving into/evading a bad area...etc.
Others may be in deer stand in a shotgun only zone.
Perhaps they prefer to hunt driven deer...in a shotgun only zone.
Example.
English Straight Stocked guns, with 21"-23" barrels, make great slug guns.
Enough weight forward allowing for a smooth mounting of gun to face, smooth swing, follow through and with gun fit, fitting shooter with English stock, the perceived recoil is less.
Recoil is going where it is supposed to be for one - due to gun fit, second, hand positioning assists with not only handling ,the recoil going more straight back is "less perceived".
One has to take into account, the shooter has LOTs of trigger time, ingrained correct basic fundamentals, and environments can be rural to urban.
Art & Science. Like Brister said...