Remington
The budget Foster slug benchmark. A 1-ounce rifled slug at 1,560 fps for smoothbore barrels, affordable enough for serious slug practice.
Remington's Slugger line is the original Foster slug, and the SP12RS is its bread-and-butter 2-3/4 inch loading: a 1-ounce soft-lead rifled slug at 1,560 fps. Like all Foster slugs it is designed for smoothbore barrels, and its job is to give shotgun hunters an affordable single-projectile option without the cost of premium sabot ammunition. For deer inside 75 to 100 yards from a smoothbore, it does exactly that.
The value here is real. Slugs recoil hard and slug practice is unpleasant, but it is also necessary, because every smoothbore patterns and zeroes slightly differently and you cannot trust a slug gun you have not confirmed. The Slugger's affordability makes it the load to shoot while you sight in and learn your gun's slug zero, then keep on hand for hunting. It gives up some accuracy and downrange energy to the higher-velocity Federal Power-Shok and to sabot loads, but inside its effective range it is entirely adequate on whitetail.
If you want the cheapest path to a working smoothbore slug setup, or you simply prefer Remington, the Slugger is the pick. Pair it with rifle sights or a low-power optic and confirm your zero before season.
Add the Remington Slugger Rifled Slug (SP12RS) to your build and see how it enhances your platform.