Black Hills 357 Magnum 158gr Lead Conical Nose Cowboy Action Ammunition. Being from Dakota Territory, it's only fitting that Black Hills make ammunition for the Cowboy Action Shooter. Though being from Dakota Territory, they couldn't just stop there. They involve the shooters. They ensure every load is authentic. To that end, Black Hills is proud to offer period correct ammunition fit for 1880 or tomorrow afternoon. Mfg: Black Hills Ammunition