Airguns · Explainer
Big bore air rifles: power, calibers and what they can hunt
Researched by James · Updated September 26, 2026 · Editorial policy
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Specs and prices below come from AirForce's and Umarex's own product pages plus an independent Hard Air Magazine review, linked in Sources, checked in September 2026. Full methodology & editorial policy →
What makes a big bore an air rifle, not a firearm-lite
A big bore PCP works exactly like a small-game PCP — compressed air stored in a reservoir, released through a valve to drive a projectile — just scaled up. Bigger valve, bigger bore, and a heavier slug (commonly 150-550+ grains depending on caliber) instead of a 15-30 grain pellet. That combination trades shot count hard: where a .22 hunting PCP might get 30-150+ shots per fill, a big bore gets single digits at full power. Big bores are built around delivering one devastating, well-placed shot, not a long string.
Two verified production big bores
| AirForce Texan | Umarex Hammer | |
|---|---|---|
| Price | $1,039.95 (all calibers) | $1,099.99 MSRP |
| Calibers | .257, .308, .357, .457, .510 | .50 (.510) only |
| Muzzle energy | 175 FPE (.257) up to 600+ FPE (.45 TX2 valve) | 700+ FPE with a 550-grain slug |
| Fill pressure | 3,000 psi max | 4,500 psi tank feeding a 3,000 psi shot reservoir |
| Shots per fill | ~10 | 3 full-power + 2 diminishing follow-ups |
The Texan's big advantage is caliber choice — you can order it in anything from a rabbit-scaled .257 up to a true .510 hog and deer round, and AirForce's TX2 valve upgrade on .45-caliber models pushes bullets to 1,000 fps for 600+ FPE. The Hammer is a one-trick specialist: only .50 caliber, but tuned specifically for that caliber's ballistics, and independently reviewed as delivering genuinely massive energy for a production air rifle.
James's honest Texan experience
I owned and hunted with an AirForce Texan in .257 alongside my FX Impact M4 in .22. On one collared-dove hunt, the Texan's valve O-ring failed mid-hunt, and the .22 M4 carried the rest of the hunt. That's not a knock on big bores generally — it's a reminder that a single-shot-per-fill rifle has zero redundancy if something goes wrong in the field, which is a real tradeoff against a small-game PCP's forgiving shot count. The full story, misses included, is in FX Impact M4 vs Texan .257: accuracy beat power.
The FX Impact M4 vs the AirForce Texan .257 on collared doves — the Texan's valve failed mid-hunt.
What can you legally hunt with a big bore air rifle?
Good fit
- Hog hunters who want a quieter, lower-recoil alternative to a firearm
- Hunters in states that permit air rifles for deer at legal calibers
- Shooters who accept single-digit shots per fill for a clean, ethical kill
Look elsewhere
- Small game and pests — a .22-.25 PCP is quieter, cheaper, and more efficient
- Anyone unwilling to verify state big-game air rifle law before hunting
- Backup-free hunts far from help — a big bore has almost no shot redundancy
Verdict
For hogs and legally-allowed deer hunting, the AirForce Texan is the more flexible buy because it spans five calibers on one platform, while the Umarex Hammer is the harder-hitting specialist if .50 caliber energy is specifically what you're after. Either way, budget for redundancy in your plan, not just your rifle — my own Texan's valve failure mid-hunt is exactly the scenario a big bore's low shot count leaves you exposed to. The same energy-at-the-animal logic that sets the 12+ FPE floor for rabbits in the airgun FPE chart scales up here — a big bore just needs hundreds more foot-pounds to do the same clean job on a much larger animal.
Big bore air supply
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Not sure a big bore is the right step up? Compare it against a standard small-game PCP in best PCP air rifles by budget, or work through the air rifle decision guide first.
FAQ
What counts as a big bore air rifle?
Generally .30 caliber and up, though .35 through .50+ is where most dedicated big bore hunting rifles live. Below .30, you're in standard small-game PCP territory even at high power.
How much FPE does a big bore air rifle produce?
It varies hugely by caliber and rifle: roughly 150-250 FPE for a .30-.357, up to 700+ FPE for a full-power .50 caliber like the Umarex Hammer with a 550-grain slug. Compare that to the roughly 12-40 FPE range of a small-game PCP.
Can you hunt deer with a big bore air rifle?
In some states, yes, with minimum caliber and energy requirements that vary by state wildlife agency — check your state's regulations before you plan a hunt. Where it's legal, hunters generally use .357 caliber and up with premium slugs at close-to-moderate range.
How many shots does a big bore air rifle get per fill?
Far fewer than a small-game PCP: the AirForce Texan gets about 10 shots per fill at lower-power calibers, and the Umarex Hammer delivers 3 full-power shots plus 2 diminishing follow-ups before you need to refill. Big bores are built around one or two well-placed shots per animal, not volume.
What fill pressure do big bore air rifles need?
The AirForce Texan fills to 3,000 psi; the Umarex Hammer's onboard reservoir runs off a 4,500 psi tank. Either way, you need a high-pressure hand pump, tank, or compressor — the same air infrastructure a small-game PCP needs, just used up faster per animal.
Is a big bore air rifle legal to hunt with?
Air rifles for big game are legal in a growing number of US states, each with its own minimum caliber, energy, and sometimes broadhead-style projectile requirements. Confirm current rules with your state wildlife agency before hunting anything larger than small game with one.
What can you hunt with a big bore air rifle?
Hogs are the most common big bore quarry and don't require special big-game air rifle regulations in most places since they're typically classified as invasive or non-game. Deer, and in a few states larger game, require checking your specific state's air rifle hunting regulations first.
