Ammunition selection sits at the intersection of platform, purpose, and regulation. A shooter who hunts geese, carries a defensive handgun, and owns a bolt-action rimfire will use three entirely different cartridge families in the same season. This guide covers ten distinct ammunition categories — shotshell, centerfire handgun, specialty handgun, and rimfire — that together define the working inventory of a serious U.S. shooter.
Big-Bore and General-Purpose Shotshells
The 10 gauge sits at the top of the shotshell hierarchy by bore diameter (0.775 inches), and 10 gauge ammo is the reference load for snow goose, turkey, and long-range waterfowl where pellet count matters more than platform weight. A 3½-inch 10 gauge load carries up to 2¼ ounces of shot compared to 1¾ ounces in a 3½-inch 12 gauge magnum — a measurable increase at 45 to 55 yard distances.
General-purpose 12 gauge handles ninety percent of practical shotgun use. Every shotgun shell in 2¾-inch 12 gauge is fully cross-compatible across standard pump, semi-auto, and break-action platforms, which is why 12 gauge remains the highest-volume shotshell cartridge in U.S. retail.
Defensive and Hunting Shotshell Specialties
For inside-the-home defensive use, nothing delivers comparable terminal energy to 12 gauge 00 buckshot. A standard 9-pellet load at 1,325 fps puts nine .33-caliber projectiles on target simultaneously — each pellet comparable to a .38 Special round in terminal effect.
For deer in shotgun-only jurisdictions, 12 gauge slugs deliver 2,360 ft-lbs of muzzle energy from a 1-ounce Foster projectile. Sabot slugs from rifled barrels extend effective range to 150 yards with sub-2-inch 100-yard groups in quality platforms.
Non-Toxic and Niche Shotshells
Federal waterfowl regulations require non-toxic shot on all federal and state wetland jurisdictions. Modern steel shotgun shells push No. 2 or BB steel at 1,450 to 1,550 fps to compensate for steel’s 30% lower density versus lead, with most serious waterfowlers stepping up two shot sizes from their historical lead selections.
The 16 gauge survives as a specialist upland bore. Quality 16 gauge shotgun ammo delivers a 1⅛ oz payload at roughly 15% less recoil than 12 gauge while maintaining identical pellet count, which matters for upland hunters walking 6 to 10 miles a day.
10mm Auto and Premium Handgun Loads
For handgun hunters and bear-country carriers, 10mm ammo sits between the .40 S&W and the .41 Magnum in terminal energy. A full-pressure 180-grain load generates 700+ ft-lbs at the muzzle — measurable gain over typical .45 ACP (400 ft-lbs) for wild boar, black bear, and whitetail at handgun distances.
Within the 10mm market, two loaders define the premium tier. buffalo bore 10mm delivers a 220-grain hardcast flat-nose at 1,200 fps with gas-checked penetration built for dangerous game. The parallel option is 10mm underwood, which spans the Lehigh Xtreme Penetrator at 1,700 fps through 220-grain hardcast matched to hunting-pistol loads.
Rimfire Precision
For varmint and small-game work, 17 hmr ammo delivers 2,550 fps from a 17-grain polymer-tipped bullet, producing sub-1-inch 100-yard groups from competent platforms. Effective range on ground squirrels and prairie dogs extends to 175 yards — roughly 50% farther than .22 WMR.
Building a Complete Inventory
A practical shooter’s ammunition locker typically holds seasonal quantities of each category: a case of 12 gauge target loads, 200 rounds of defensive buckshot, 50 rounds of slugs for deer season, 250 rounds of steel shot for waterfowl, 200 rounds of premium 10mm for carry rotation, and 500 rounds of 17 HMR for varmint season. Storage at 50 to 70°F under 55% humidity preserves modern non-corrosive-primed ammunition indefinitely.
A practical shooter’s ammunition locker typically holds seasonal quantities of each category: a case of 12 gauge target loads, 200 rounds of defensive buckshot, 50 rounds of slugs for deer season, 250 rounds of steel shot for waterfowl, 200 rounds of premium 10mm for carry rotation, and 500 rounds of 17 HMR for varmint season. Storage at 50 to 70°F under 55% humidity preserves modern non-corrosive-primed ammunition indefinitely.
