The first thing to know is that there's no universally correct nontoxic shell for duck hunting. Anyone telling you TSS is always worth it, or that steel is always enough, is selling something or hasn't thought it through.

This is what the numbers actually look like, and what they mean in the marsh.

The Density Problem That Lead Never Had

Lead was easy. You picked shot size by species and distance, and that was mostly it. Density wasn't a word you thought about.

Nontoxic changed the game because the legal alternatives aren't equal to lead — some are worse, some match it closely, and one (TSS at 18 g/cc) beats it. The spread between your choices is wider than most hunters realize:

  • Steel: 7.8 g/cc — significantly lighter than lead (11.2 g/cc), which is why you have to size up
  • Bismuth: 9.6 g/cc — 23% denser than steel, behaves closer to lead on most shots
  • TSS (tungsten super shot): 18 g/cc — denser than lead by 60%, which is why #9 TSS kills ducks at ranges where #4 steel cannot

Density determines retained velocity downrange, pattern density at distance, and how deep pellets penetrate. When someone says "steel at 40 yards is fine," they mean something very specific: steel #2s or BBs at 40 yards, from a well-choked gun, at a mallard with its wings cupped. Change any of those variables and fine becomes marginal.

What Steel Actually Does Well

Steel is still the right call for most duck hunters, most of the time. It's cheap enough to pattern extensively, available everywhere, and at 35 yards or less it kills ducks cleanly when you're running the right load.

Run two shot sizes larger than lead. If you were shooting #4 lead, you're running #2 steel. For teal at 20 yards, you can get away with #4 steel. For mallards and bigger puddle ducks, #2 is the floor. Anything pushing 40 yards, move up to BB or BBB.

Keep shots inside 40 yards. This isn't a soft guideline — it's where the pellet energy math stops working reliably. Federal's ballistics data shows #2 steel at 1,400 fps running out of adequate penetration past 38–42 yards depending on choke and load. That 1.5" minimum penetration threshold is the line between a clean kill and a winged bird.

Match your choke to your distance. Steel patterns tighter than lead at the same constriction, which surprises hunters who don't pattern before season. A modified choke with steel often performs like a full choke with lead. Over decoys at 25 yards, improved cylinder is the right call. For longer crossing shots at 35–40 yards, modified. The biggest mistake I see in duck blinds is hunters running full chokes with steel because "tighter is better" — steel through a full choke doesn't spread, it sends a dense column that hits like a slug or misses entirely.

What steel can't do: it can't compensate for sketchy shots past 45 yards, and it struggles on big geese even with BBB because pellet count at that size drops fast.

Bismuth: The Old-Barrel Solution That Earned Its Keep

Bismuth costs more — $2.50 to $4 per shell depending on the brand — but it pays for itself in specific situations.

The first is the old gun problem. If you're hunting with a fixed-choke gun, a vintage over/under, or anything with barrels not rated for steel, bismuth is your option. It's soft enough to be safe through any choke, including full. A lot of hunters have a granddad's 870 or a Browning Auto-5 they'd rather not give up, and bismuth makes those guns viable again.

The second situation is performance past 40 yards. At 9.6 g/cc, bismuth retains velocity better than steel. BOSS Shotshells's #2 bismuth shows roughly 34% more penetration at 40 yards in gel testing compared to steel #2 at the same velocity. For river bottoms where mallards flare at 45–50 yards, or any hunt where your average shot is at steel's edge, bismuth moves your effective ceiling meaningfully.

You can also run bismuth through tighter chokes than steel safely, which lets you get real pattern density at 45 yards — something you can't safely do with steel.

Kent, BOSS, and Winchester all make solid bismuth loads. BOSS runs slightly cheaper per box and performs comparably to Winchester in pattern testing. Federal makes bismuth too, though it's harder to find consistently stocked at most distributors.

TSS: When $9 a Shell Actually Makes Sense

TSS at 18 g/cc is a different category. The density lets you drop to tiny pellet sizes — hunters run #9 TSS for ducks — and still have more downrange energy than steel BB. That sounds backward until you pattern it: a #9 TSS load puts dramatically more pellets in a 30" circle at 50 yards than any steel load will.

The range story from penetration testing makes this concrete: #5 TSS at 1,350 fps hits the 1.5" minimum penetration mark at 159 yards. #5 bismuth hits the same mark at 41 yards. This isn't about shooting 159-yard ducks. It's about having enough margin that a 55-yard crossing shot doesn't require a perfect vital-zone hit to fold the bird.

TSS earns its price in three situations.

Late-season divers. Scaup, bluebills, redheads in November after pressure has been on for two months — these aren't cupped mallards at 25 yards. They're 45–50 yard crossing shots from a layout boat in the wind. TSS makes that range actually manageable rather than hopeful.

Snow geese. Pass shooting light geese with any ethical margin needs performance that steel T shot can't deliver at 60+ yards. TSS BBB gives you pattern density at distance that changes what's possible.

Situations where you can't control the range. If your hunting regularly puts you at 40–60 yards regardless of how you set up — big open water, public birds that won't commit — TSS is the honest tool for the job.

The cost argument doesn't work at close range. If your hunting is over well-placed decoys inside 35 yards, steel #2s do the same work for a fraction of the price. The $9 shell is for the trips that need it, not every teal shoot in September.

The blended loads — Federal Black Cloud TSS, some Hevi-Shot options — sit between pure TSS cost and full tungsten performance. Worth patterning if you want one shell for mixed situations without committing to a full TSS budget on every box.

The Choke Question

Each shell material needs different choke logic, and this is where hunters running the wrong combo either blow patterns or stress their gun.

For steel, the maximum safe constriction is generally modified (0.020"). Most duck hunting situations call for improved cylinder or light modified. Full and extra-full chokes with steel will not give you a denser pattern — they'll give you a tighter core with a lot of empty space around it, and on older guns they'll stress the choke threads. The hardness of steel doesn't respond to constriction the way lead does.

For bismuth, you can run up to full choke safely. Its malleability means it doesn't create the pressure spike steel does through tight constriction. This is a real practical advantage: you can choke down for 45-yard shots in ways that aren't safe with steel.

For TSS, the small pellet sizes need some constriction — modified to improved modified is a reliable starting range. But the honest answer is that no rule of thumb beats patterning your actual gun. A roll of butcher paper at 40 yards before opener tells you more than anything, and with TSS at $9 a shell, knowing your pattern before you're in the blind is worth the investment.

One note for older guns: if your choke tube says "steel only" or has a specific pellet size limit stamped on it — common on older Rem-Chokes and Winchokes — don't run bismuth or TSS without confirming with the manufacturer. Most modern tubes rated for steel work fine with bismuth and TSS, but older fixed-choke guns and vintage interchangeable systems need verification before you assume.

The Short Version

Over decoys inside 35 yards, modern gun with interchangeable chokes: steel. Size up two shot sizes from lead, pattern it with an improved cylinder or modified choke, and spend the savings on a second box to practice with.

Hunting a fixed-choke gun, or regularly taking shots at 40–50 yards: bismuth. The $3/shell cost is real, but less than a damaged barrel and more reliable than hoping steel gets there.

Late-season divers, pass shooting geese, or any hunt where 50+ yard shots are normal: TSS. Budget it specifically for those trips rather than running it everywhere.

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