TheHunter: Call of the Wild Wiki

"A massive slug that offers high stopping power and penetration, designed to take down the largest of game. Encased in an old-school brass shell."
― In-Game Description

The 10 GA Brass Slug is an ammunition type available for the Miller Model 1891 family of shotguns.

This ammo is available as part of the Smoking Barrels Weapon Pack DLC.