Steel shot refers to small, spherical pellets made from carbon steel. It serves two major purposes: as non-toxic ammunition for shotgun hunting (especially waterfowl) and as an abrasive medium for industrial surface treatment. The pellets range from tiny beads under a millimeter across to larger balls several millimeters in diameter, depending on the application.
Steel Shot for Hunting
In the hunting world, steel shot is the most common alternative to traditional lead pellets. It became standard for waterfowl hunting in the United States after a federal regulation banned lead shot for hunting ducks, geese, swans, and coots nationwide in 1991. The ban was phased in over several years, starting in 1986, with more counties added each year until the transition was complete.
The reason for the switch was straightforward: lead pellets were poisoning birds. A U.S. Geological Survey study that examined over 9,000 hunter-killed waterfowl across all four flyways found that 8.7% of diving ducks had ingested one or more lead pellets, along with 5.5% of dabbling ducks and 1.3% of geese. Liver analysis revealed that lead exposure rates were actually higher than ingested pellet counts suggested, meaning birds were absorbing lead from their environment even without swallowing whole pellets. Steel shot dissolves this problem entirely since steel is non-toxic to wildlife.
How Steel Compares to Lead
The key difference between steel and lead comes down to density. Lead is significantly heavier, at about 10.9 grams per cubic centimeter, while steel sits at 7.8 g/cc. That roughly 30% density gap means steel pellets are lighter, which has real consequences for how they perform in flight. Steel sheds velocity and energy faster than lead at the same pellet size, which matters most at longer distances.
Hunters compensate for this with a simple rule of thumb: go two shot sizes larger when switching from lead to steel. So if you’d normally use a No. 4 lead load, you’d step up to No. 2 steel. The larger pellets carry more mass individually, helping close the energy gap at typical hunting ranges. Steel shot also leaves the barrel at higher velocities than lead in most modern loads, which partially offsets its lighter weight.
One upside of steel’s lower density is that it’s harder than lead, so pellets hold their round shape better and don’t deform on impact with the barrel or choke. This can produce tighter, more consistent patterns. The tradeoff is that the lighter pellets carry less momentum downrange, making shot placement and distance management more important.
Steel Shot in Industrial Use
Outside of hunting, steel shot is a workhorse material in metalworking and manufacturing. The two main industrial applications are shot blasting and shot peening, and the distinction between them matters.
Shot blasting uses steel pellets (or angular steel grit) propelled at high speed to clean, descale, or prepare metal surfaces. The pellets are typically launched by spinning wheels rather than compressed air, a method called airless blasting. This strips rust, old paint, mill scale, and other contaminants from steel components before coating or welding. Cast steel shot and grit are the standard choices for blasting steel surfaces.
Shot peening is a different process entirely. Instead of removing material from a surface, peening works by plastically deforming it. Spherical steel pellets strike the metal surface repeatedly, creating tiny dimples that introduce compressive stress into the outer layer. This compressive layer makes the part more resistant to fatigue cracking, corrosion, and stress fractures. It’s widely used on aircraft components, automotive springs, gears, and turbine blades. Industrial steel shot for these applications is heat treated to a hardness of 42 to 50 on the Rockwell C scale, with specialty grit varieties reaching 56 to 60 Rc for more aggressive work.
Industrial steel shot comes in sizes ranging from 0.18 to 2.4 mm in diameter. Stainless steel shot is also available for applications where rust contamination would be a problem, such as cleaning aluminum castings, though it costs considerably more than conventional carbon steel shot.
How Steel Shot Is Made
Most steel shot starts as molten steel that gets formed into spherical droplets. One common manufacturing method is centrifugal atomization, where molten metal is fed into a rapidly spinning crucible (sometimes water-cooled). Centrifugal force pushes the liquid metal up and over the crucible’s rim, where it breaks apart into droplets that solidify into spherical pellets as they cool. Adjusting the rotation speed, typically between 500 and 4,000 revolutions per minute, controls the size of the resulting particles. Faster speeds produce finer shot, while slower speeds yield larger pellets.
After forming, industrial-grade shot goes through heat treatment to achieve the desired hardness. Hunting-grade steel shot is generally softer than industrial shot, since it needs to pass safely through shotgun barrels and chokes without damaging them.
Choosing Steel Shot for Waterfowl
If you’re buying steel shot for duck or goose hunting, the most practical thing to know is the size conversion. Common steel shot sizes for ducks over decoys range from No. 2 to No. 4, while goose hunters typically use BB or BBB steel. These are two sizes larger than what you’d pick in lead for the same birds at the same distances.
Modern steel loads have improved dramatically since the early days of the lead ban, when hunters complained about poor performance. Today’s high-velocity steel loads are effective at reasonable ranges, and many manufacturers offer premium options with optimized wad designs for better patterns. For hunters wanting even more downrange energy, several alternative non-toxic materials now exist with densities closer to or exceeding lead (some reaching 12.0 g/cc), though they come at a significantly higher price per box. Standard steel remains the most affordable and widely available non-toxic option.