The fastest way to waste money on ammunition is buying based on caliber alone without considering intended use. A 220-grain hardcast 10mm is superb on wild boar and genuinely dangerous on human-target defensive deployments; a 135-grain defensive JHP is the inverse. The framework below pairs ten ammunition categories with the specific shooting purposes that justify them.

Waterfowl and High-Altitude Game

For hunters pursuing snow geese at 45 to 55 yards over decoys, 10 gauge shotgun ammo in 3½-inch BB or BBB steel earns its place despite the weight and cost premium. No 12 gauge loading produces equivalent pellet density at that range window — this is the single strongest use case for maintaining a 10-bore in the rotation.

Clays, Upland, and General Sporting Use

For 90% of volume shotgun shooting, standard 12 gauge shotgun shells in 1 oz or 1⅛ oz target loads at 1,200 fps cover trap, skeet, sporting clays, and lighter upland game. Case-of-250 pricing runs $75 to $110 for quality brands, which is what makes 12 gauge the default volume-shooter's cartridge.

Home Defense and Close-Range Hunting

For inside-the-home defense, reduced-recoil 12 gauge buckshot ammo at 1,150 fps combines nine-pellet terminal effect with controllable follow-up shots. Federal Tactical 8-pellet LE132 is the consensus law-enforcement issue load for the same reasons civilians should consider it.

When deer ranges exceed buckshot's 35-yard ceiling, quality slug ammo in Foster or sabot configuration delivers 1,300 to 1,800 ft-lbs at 100 yards. Match slug type to barrel: Foster for smoothbores, sabot for rifled tubes.

Waterfowl-Specific Non-Toxic Loads

Federal regulation makes lead shot illegal for waterfowl. Modern shotshells for duck hunting compensate through higher velocity (1,450 to 1,550 fps) and stepped-up pellet sizing. A hunter previously using No. 6 lead for mallards should now use No. 4 steel — two shot sizes larger — to maintain comparable pattern energy at 35 to 40 yards.

Recoil-Sensitive and Vintage-Gun Loads

For shooters running recoil-sensitive platforms or pre-war doubles, a properly matched 16 gauge shotshell in 1 oz at 1,165 fps delivers upland performance at reduced recoil. Specialty loaders (RST, B&P) cover short-chamber vintage guns at working pressures matched to original design specifications.

Defensive Handgun and Range Practice

For range practice and defensive training, 10 mm ammo in 180-grain FMJ runs $0.75 to $1.25 per round and cycles reliably through properly-sprung Glock 20 and Delta Elite platforms. Bonded 180-grain JHP at 1,275 fps handles the defensive role when full-power carry is the goal.

Dangerous-Game and Wilderness Carry

For pack carry in grizzly country or handgun-season hunts on larger game, 10mm buffalo bore in the 220-grain hardcast loading penetrates 48+ inches in wet newsprint — the threshold Tim Sundles identifies as adequate for brown-bear defensive use.

A parallel-tier option, underwood ammo 10mm, pairs the same hardcast specifications with chronograph-verified velocity data and typically tighter standard deviation (12 to 18 fps) than general-market premium.

Varmint and Small-Game Precision

For ground squirrel, prairie dog, and raccoon work at 100 to 175 yards, 17 hmr bullets in 17-grain V-Max configuration deliver explosive expansion with ethical range that nearly doubles that of .22 Magnum. For meat rabbits, drop to .22 LR; the 17 HMR's terminal expansion ruins usable tissue on body shots.