We have been using the same 3-9 Bushnell scopes for turkeys the same as slug guns for five years. Put them on for turkey season and put them back on for deer season. All B-Square scope mounts, only turn the power down to 3 for turkeys.
So far they have taken the beating from 3" slugs to 3 1/2 inch turkey loads.
Plus everyone has the same setup from deer to turkeys. I am impressed so far. At 3 power you can sure center on the bird in the thick stuff.
I use mine alot to check turkeys at a distance on a higher power.
With the B-square scope mounts there is a space to see the front bead if you have to use it if your scope fogs up for some reason or in the rain.
I was in a major sporting goods store a month ago, and the gun dept. salesman was telling a potential customer that he would not shoot a rifle scope on a slug gun or a turkey gun. It would blow a- part on the recoil.
I have 8 of the same scopes on shotguns, muzzleloaders and have not had a problem in five years. They are not the high dollar scopes either.
I would suggest looking at all the options, but decide on what you like but I am sold on the scopes we use and never had a problem. Don't need a pair of binoculars either with a variable.