12 Gauge Shotguns in Australia: Which Action, and Which Licence

Magnum Sports — NSW Firearms Dealer Licence No. 413159984. Last reviewed: 12 October 2026.

For most Australian shooters the 12 gauge over-and-under is the right first shotgun. It sits in Category A, the broadest NSW licence category, because that category covers shotguns other than pump-action, lever-action or self-loading. Semi-auto and pump-action shotguns sit in Category C or D and are restricted. Barrel length, choke and gun weight change what the gun does far more than the brand on the rib.

The licence question, first

Shotgun actions are split across four NSW categories, and the split is about the action, not the gauge. A .410 pump and a 12 gauge pump are in the same category as each other.

In practice this means a break-action shotgun — over-and-under, side-by-side or single barrel — is a Category A firearm, the same category as a rimfire rifle or an air rifle. That is the ordinary pathway and it is why nearly every new clay shooter and bird hunter starts there.

Categories C and D are restricted. They are not a matter of paying more or waiting longer; they require a genuine reason that most shooters do not have, typically primary production or registered clay target competition. If somebody tells you a semi-auto is an easy first shotgun, they are not describing NSW.

One point of confusion worth clearing up, because it comes up at the counter most weeks. The 2026 reform that moves straight-pull and some pump-action rifles to Category C has passed but is not yet in force, and will commence on proclamation on a date still to be determined. That change is about rifles. Pump-action shotguns were already Category C and nothing about them is changing. Our categories explainer covers all of this, and the buyback explainer covers what is and is not affected.

Whichever category you land in, you need the licence and a Permit to Acquire for the specific shotgun, and since 1 July 2026 a safe storage inspection sits in front of every permit. Get the safe sorted early.

The five actions, and who each one suits

Over-and-under. Two barrels stacked, one sighting plane, two chokes available instantly. This is the default competition and field gun in Australia for good reason: it is simple, it balances well, you can see at a glance that it is unloaded, and the single narrow sighting plane suits precise shooting at clays. Category A. If you are buying one shotgun to do everything, buy this. We hold 238 over-and-unders at over & under shotguns.

Side-by-side. The traditional game gun. Lighter and faster-handling than most over-and-unders, with a wider sighting plane that some shooters find quicker to pick up and others find distracting. It is a walked-up bird gun and a thing of some beauty, and it is a poor choice for a high-volume clay shooter because the recoil comes back on a lighter frame. Category A. Twenty-three in stock at side by side shotguns.

Single barrel. One shot, minimal weight, minimal price. A genuinely sensible first gun for a young or small-statured shooter in .410 or 20 gauge, and a useful farm gun. The discipline of one shot is not a bad teacher either. Category A.

Semi-automatic. Recoil or gas operated, cycling itself. Soft on the shoulder because the action absorbs some of the recoil impulse, which is why high-volume shooters like them. Category C or D depending on magazine capacity, and restricted accordingly.

Pump-action. Manually cycled, robust, long associated with heavy field use. Category C or D on the same magazine threshold. Restricted.

There is also a lever release family, which is a distinct action again and sits differently in the categories. We set out the difference between lever action and lever release in our lever-action guide — the distinction matters legally and people routinely get it wrong.

Gauge: 12, 20, 28 or .410

Gauge is an old measurement and the numbers run backwards: the smaller the number, the bigger the bore.

12 gauge is the Australian standard and it is standard for sound reasons. The widest ammunition choice by a long way, the cheapest shells, enough payload for everything from quail to clays to larger game birds, and a gun heavy enough to swing smoothly. If you only ever own one shotgun it should almost certainly be a 12. We hold 390 of them at 12 gauge shotguns.

20 gauge is the thinking shooter's alternative. Appreciably lighter to carry all day, noticeably softer on the shoulder, and in competent hands it does everything a 12 does inside sensible range. The trade is ammunition: fewer loads, slightly dearer, and less of it on any given shelf. It is the gauge we most often recommend to smaller-framed shooters and to anyone who walks a long way for their birds.

28 gauge and .410 are specialists. The 28 is a delightful upland and skeet gauge with a reputation for patterning above its weight. The .410 is the lightest of all and the hardest to shoot well, because the pattern is small and unforgiving — which makes it a questionable choice for a beginner despite being the one most often handed to beginners. We stock 27 at .410 shotguns, and they earn their place as farm guns and for experienced shooters who want the challenge.

Barrel length and what it actually changes

Longer barrels do not shoot harder. Beyond about 28 inches, extra length adds almost nothing to velocity. What it does add is swing: a longer barrel carries more weight forward, so it is slower to start moving and harder to stop, which smooths out a swing and reduces the tendency to pull up and stop on a crossing target.

That is why the lengths sort themselves roughly like this. 30 and 32 inch barrels suit trap, sporting and anywhere the targets are long and the swing matters. 28 inch is the great all-rounder and the length most Australian field guns come in. 26 inch suits close work, thick cover and skeet, where you want the gun moving the instant it comes up.

Fit matters more than any of it. A shotgun is pointed, not aimed, so if the stock does not put your eye where the rib tells it to look, you will shoot around the target forever and blame the gun. Come in and we will put one against your shoulder.

Chokes, briefly

Choke is a constriction at the muzzle that controls how quickly the shot column spreads. More constriction equals a tighter pattern that holds together further; less constriction equals a wider pattern that opens sooner.

The practical version: cylinder and improved cylinder for close, fast work in cover and for skeet. Modified for general field shooting and sporting clays, and the one choke to own if you only own one. Improved modified and full for trap, long crossers and decoyed birds at distance.

Two warnings. Choke is not a substitute for being on the target — a tighter choke makes a near miss into a clean miss. And steel shot behaves differently to lead and should not be fired through tight chokes in guns not proofed for it. Check your gun's proof marks and the choke manufacturer's guidance. Chokes are at shotgun chokes.

What we have on the wall

Four worth handling, all in stock at Roseville Chase as at 7 October:

• The Webley & Scott 900X Series — our deepest-stocked over-and-under, in 12, 20 and .410, with a boxlock action and steel shot proofing. The straightforward answer for a first gun.
• The Webley & Scott Kilworth — the same idea with scroll engraving and better timber, in 12 and 20.
• The Browning B525 Sporter — the sporting clays gun, including a 12 and 20 gauge combination set.
• The Webley & Scott Imperial — a case-hardened side-by-side for anyone who wants a traditional game gun.

The full rack is at shotguns, and shells are at shotgun ammunition. Ammunition is collection only from our Roseville Chase store — we do not ship ammunition of any kind. Bring your licence. If clays are where you are headed, our guide to trap, skeet and sporting explains the disciplines and what each one asks of a gun.

Frequently asked questions

What licence do I need for a 12 gauge shotgun in NSW?

For a break-action shotgun — over-and-under, side-by-side or single barrel — Category A, which is the broadest category. Semi-automatic and pump-action shotguns are Category C or D depending on magazine capacity and are restricted to holders with a specific genuine reason.

Is a pump-action shotgun affected by the 2026 reclassification?

No. The reclassification that has passed but is not yet in force concerns straight-pull and some pump-action rifles. Pump-action shotguns were already Category C or D and are unchanged.

12 or 20 gauge for a first shotgun?

12 for most people: cheaper shells, far more choice, and enough gun weight to swing well. Choose 20 if the gun will be carried a long way, or if the shooter is smaller framed and the recoil of a 12 would build a flinch.

What choke should I use?

If you own one, make it modified. Open it up for close work in cover and skeet; tighten it for trap and long crossers. Check steel shot compatibility before firing steel through anything tight.

Does a longer barrel shoot further?

Not meaningfully. Past about 28 inches you gain almost no velocity. What you gain is a smoother, steadier swing, which is why trap and sporting guns run long.

Can you post shotgun shells to me?

No. Ammunition is collection only from our Roseville Chase store and we do not ship ammunition of any kind.

This information is general information, not legal advice, collated from various online sources by an LLM assistant. In all cases refer to the NSW Firearms Registry for any legal or ownership matters. E&OE.