I've been whacking Deer with various slug slinging shot guns for 30yrs+ as I'm sure a few others have. Seen alot of hot shot high dollar guns with shooter that couldn't hit the broad side of a barn at 25yrds from a bench rest. Gun or Shooter - Go Figure?

Sluggers can be difficult to properly set up and get "Dialed In" - BUT
IMO - Take any of the top three selling 12/20 gauge slug slingers(you pick em or google it) with a cantelever factory or Hastings rifled barrel,
properly mount a good scope,find a sabot slug the barrel likes and you have a great Deer Whackin Slug Slinger out to 150+ yrds.

Don't care whether it be $300 or $1000 Gun.

Bottom Line - Most of it is in the hands of the shooter.