12 Gauge vs 20 Gauge

This is the first real decision most people face when buying a shotgun, and the internet answers it badly in both directions — either “12 gauge, it does everything” or “20 gauge, the 12 is too much gun.” Both are half right. The useful version of the answer depends on what you will hunt and, much more importantly, on how many rounds you will actually put through it before opening day.

What the gauge number actually means

Gauge is an old measurement and it runs backwards. It is the number of lead balls of the bore’s diameter that would weigh one pound. Twelve balls that fit a 12 gauge barrel weigh a pound; twenty smaller balls that fit a 20 gauge barrel weigh a pound. So a bigger gauge number means a smaller barrel. A 12 gauge bore is about 0.729 inches; a 20 gauge is about 0.615.

That difference in bore translates into payload. A standard 12 gauge field load carries roughly 1 1/8 ounces of shot; a standard 20 gauge load carries about 7/8 of an ounce. That is the whole physical story — about 25 percent more pellets per shot, and correspondingly more recoil to launch them.

The recoil difference, honestly

Recoil is proportional to the mass being launched and the speed it leaves at, divided by the weight of the gun. A 20 gauge firing a lighter payload out of a gun that is usually a pound lighter does not produce proportionally less recoil — but it produces noticeably less, and the gap widens with heavy loads.

What each gauge can actually hunt

The honest answer is that a 20 gauge with the right load kills everything a beginner is realistically hunting. The differences are at the edges, and they are real but narrower than the reputation suggests.

Turkey — both work, and this is where the 12 has a genuine edge because pattern density at 40 yards matters enormously. Modern high-density turkey loads have closed much of that gap, and a 20 gauge with a proper turkey choke and a premium load is a legitimate 40-yard turkey gun. Twenty years ago it was not.

Waterfowl — the 12 is the better tool. Non-toxic shot is less dense than lead, so you need larger pellets and more of them, and the 12 carries them. A 20 works perfectly well over decoys inside 30 yards, which is where most beginner duck hunting happens anyway.

Upland, dove, rabbit, squirrel — the 20 is arguably the better gun. Lighter to carry all day, faster to swing, and entirely sufficient at the ranges involved. This is exactly the case in rabbit hunting and squirrel hunting.

Deer with slugs — both are legal and effective where slug hunting is required, though the 12 has more energy. Check your state regulations first, because slug and buckshot rules for deer vary considerably; the hunting license basics guide explains where to find them.

Ammunition cost and availability

This is the strongest practical argument for the 12, and it is worth taking seriously. Twelve gauge is the most produced shotshell in the world. It is cheaper per box, it is available in every rural hardware store, and in a supply squeeze it is the last thing to disappear. Twenty gauge is usually a few dollars more per box and the specialty loads — heavy turkey, premium non-toxic — have thinner shelf presence.

For a hunter who shoots two boxes a year, that difference is negligible. For someone who wants to shoot clays regularly to get good, it adds up. Weigh it against the fact that a beginner who finds a 12 unpleasant will shoot fewer boxes of the cheaper shell than they would have of the dearer one.

Which one should you buy

Buy the 20 gauge if you are recoil-sensitive, of smaller build, buying for a younger hunter, hunting mostly upland and small game, or if you know honestly that you will practice more with a gun that does not hurt.

Buy the 12 gauge if waterfowl is a real part of your plan, if you want the cheapest and most available ammunition, or if you want one gun that covers absolutely everything with no caveats.

And whichever you pick: fit a recoil pad, buy proper hearing protection, and pattern the gun with the loads you will hunt with. Those three things will improve your results more than the gauge decision will. The specific models worth considering are in the beginner shotgun guide, and if you are still deciding between a shotgun and a rifle at all, that is answered in rifle vs shotgun.