The .308 Winchester Complete Guide: Specs, Ballistics, Bullet Types & Real-World Uses
Introduction
The .308 Winchester is the cartridge that taught the world how to do a lot with a little. It delivers full-power performance from a short, light action, with mild recoil, superb accuracy, and the deepest ammo shelf in the rifle world. Seventy years after its debut, it remains the benchmark every other medium-power round is measured against.
This guide covers the verified specifications, real-world ballistics, every major bullet type, and the honest strengths and limits of the .308 for hunting, protection, and competition. Whether you are zeroing a new bolt gun, building an AR-10, or picking a deer load, this is the reference you need.
A Quick History: From the .300 Savage to NATO Legend
The .308 was born from a military program, and that pedigree still shapes what it does best.
- 1940s — U.S. military experiments with the .300 Savage case produce the T65 series of experimental cartridges, shortened and refined to match .30-06 performance with new propellants.
- 1952 — Winchester sees a civilian market and introduces the commercial .308 Winchester, chambered in the Model 70, Model 88, and Model 100.
- 1954 — NATO adopts the T65E5 iteration as the 7.62×51mm NATO, feeding the M14 rifle and M60 machine gun.
- 1957 — The U.S. military formally adopts the M14 in 7.62×51mm NATO.
- 1980s onward — The 5.56 NATO intermediate round takes over the standard infantry rifle role, but 7.62 endures in machine guns, designated marksman, and sniper systems.
That military lineage is exactly why .308 brass and ammo are so abundant and affordable today — and why the cartridge never went away.
.308 Winchester vs 7.62×51mm NATO: What You Must Know
This is the single most important practical point in the whole guide, so it goes early.
The .308 Winchester and 7.62×51mm NATO share nearly identical external case dimensions. The real differences are in the chamber throat and headspace, plus case-wall thickness — the .308 chamber has a marginally shorter headspace and thinner case walls than the military spec.
The practical rule:
- .308 Win ammo in a 7.62 NATO chamber = generally OK. SAAMI does not consider it unsafe, and the longer military headspace accommodates it.
- 7.62 NATO ammo in a .308 Win chamber = generally OK. Military loads run lower pressure, so the shorter commercial headspace is not a problem.
- The caution case: hot, high-pressure .308 loads in a worn or oversized 7.62 NATO chamber. Inspect brass and headspace if you mix them.
Verified Specifications
The following dimensions and pressures are drawn from the CIP technical data sheet and SAAMI standards.
| Dimension | Inches | mm |
|---|---|---|
| Bullet diameter | .308 in | 7.82 mm |
| Case length | 2.015 in | 51.18 mm |
| Overall length | 2.800 in | 71.12 mm |
| Shoulder diameter | .4539 in | 11.53 mm |
| Rim diameter | .4728 in | 12.01 mm |
| Rifling twist (CIP standard) | 1 in 12 | 305 mm |
| Case capacity | 56 gr H2O | 3.64 mL |
| Pressure Standard | Max Average Pressure |
|---|---|
| SAAMI (modern piezo) | 62,000 psi |
| CIP (drilled-case piezo) | 415 MPa / 60,191 psi |
| CIP proof load | 519 MPa / 75,275 psi |
Why the numbers differ: SAAMI piezo-psi and CIP-MPa are measured by different methods with different transducer placements and are not directly comparable for the same physical pressure. Do not mix them when comparing loads.
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Ballistics: What the Cartridge Actually Does
The .308 is a full-power, short-action cartridge that pairs mild recoil with serious energy. The numbers below use manufacturer-published data and verified chronograph tests; test barrel length is noted.
Representative Factory Loads
| Load | Bullet | Muzzle Velocity | Muzzle Energy | G1 BC | Barrel |
|---|---|---|---|---|---|
| Federal Gold Medal Match | 175 gr BTHP | 2,600 fps | 2,627 ft-lbs | 0.505 | 24″ |
| Federal Gold Medal Match | 168 gr BTHP | 2,650 fps | 2,619 ft-lbs | 0.462 | 24″ |
| Federal Fusion | 150 gr SP | 2,820 fps | 2,648 ft-lbs | — | 24″ |
| Hornady Precision Hunter | 178 gr ELD-X | 2,610 fps | 2,692 ft-lbs | 0.552 | 24″ |
| Hornady SST | 150 gr PT | 2,750 fps | 2,518 ft-lbs | 0.415 | 22″ |
| Nosler Partition | 180 gr SP | 2,550 fps | 2,599 ft-lbs | 0.474 | 22″ |
| Nosler AccuBond | 200 gr PT | 2,475 fps | 2,721 ft-lbs | 0.481 | 22″ |
| Barnes VOR-TX | 150 gr TTSX | 2,910 fps | 2,821 ft-lbs | — | 24″ |
Energy Retention Downrange
| Distance | 178 gr ELD-X | 168 gr Match | 150 gr Soft Point |
|---|---|---|---|
| Muzzle | 2,692 ft-lbs | 2,619 ft-lbs | 2,648 ft-lbs |
| 200 yd | 2,079 ft-lbs | 1,925 ft-lbs | 1,689 ft-lbs |
| 300 yd | 1,817 ft-lbs | 1,636 ft-lbs | 1,325 ft-lbs |
| 400 yd | 1,581 ft-lbs | 1,383 ft-lbs | 1,027 ft-lbs |
| 500 yd | 1,370 ft-lbs | 1,162 ft-lbs | 789 ft-lbs |
The lesson is clear: the high-BC 178 gr hunting bullet holds energy far better than a light soft point at distance. That is exactly why modern hunters and competitors run heavy, high-BC bullets.
Recoil
The .308 produces roughly 3.5–4× the free-recoil energy of a .223/5.56 in comparable rifles. In an 8 lb rifle, a 150 gr load generates about 15.8 ft-lbs, versus about 4.2 ft-lbs for a .223. It sits just above the 6.5 Creedmoor (~13.1 ft-lbs) and just below the .30-06 (~17.9 ft-lbs) — the classic “middle” full-power cartridge. Heavier 175–180 gr bullets add about 2 ft-lbs over a 150 gr load.
Short-Barrel Behavior
The .308 loses roughly 20–25 fps per inch of barrel in the 16–24″ range, with diminishing returns past 20″. Below 16″ losses climb to 50–80+ fps per inch as powder burns incompletely. A 16″ AR-10 still retains about 95% of advertised velocity for common loads — which is why short-barrel .308 builds remain genuinely effective.
Accuracy & Wind
- Factory match ammo: 0.5–0.75 MOA expected in a good rifle.
- Hand-loaded match: 0.25–0.5 MOA achievable.
- Wind at 500 yd (10 mph full-value): high-BC 178 gr bullets drift about 19 inches versus about 34 inches for a 150 gr soft point — a 40–45% advantage for the heavier bullet.
Bullet Types & Ammunition Selection
The .308’s versatility comes from its enormous bullet lineup. Here is how to choose.
Target & Match
Match bullets (HPBT, OTM) from 150 to 220 gr are the gold standard for accuracy. Sierra MatchKing (168/175/220 gr), Berger VLD Target, and Hornady ELD Match (168/178 gr) dominate competition, loaded by Federal Gold Medal and CenterStrike. The 175–178 gr class is the long-range favorite and wants a faster twist.
Varmint & Small Game
The .308 is not a dedicated varmint round, but lighter .30 bullets (125–165 gr) and monolithic copper bullets (Barnes MPG) handle coyote and small game at moderate ranges. Frangible bullets disintegrate on steel targets and suit indoor ranges and safe backstops.
Hunting & Deer/Elk
For deer-size game, use 150–165 gr polymer-tip or soft-point bullets. For elk and large game, step up to 165–220 gr bonded, partition, or monolithic designs: Nosler AccuBond/Partition, Barnes TSX/LRX, Hornady ELD-X, Berger Classic/Elite Hunter, Federal Terminal Ascent/Fusion, and Winchester Expedition Big Game. These expand reliably and penetrate deeply — the thin-jacketed varmint bullets do not.
Defensive / Barrier-Blind
For home defense, FMJ and OTM designs (Federal Gold Medal CenterStrike OTM, Gold Medal SMK) perform most predictably through common barriers. “Barrier blind” is a marketing term — no bullet is unaffected by walls — but FMJ and OTM designs behave more consistently than hollow points through drywall and glass.
Bullet Construction Glossary
- FMJ (Full Metal Jacket): Lead core fully encased in copper. Does not expand; for target and training.
- HPBT (Hollow Point Boat Tail): Hollow nose for expansion with a tapered base for higher BC. Sierra MatchKing is the reference design.
- OTM (Open Tip Match): Open-tip match bullet for consistency; functionally similar to HPBT.
- SP (Soft Point): Exposed lead tip for reliable hunting expansion.
- Bonded: Jacket chemically bonded to core for controlled expansion and deep penetration.
- Partition: Dual-core design with a partition wall — front core for expansion, rear core for penetration.
- Monolithic (Solid Copper): One-piece copper bullet; expands into petals and retains high weight.
- ELD-X / ELD Match: Hornady’s high-BC match-accurate hunting and target lines with consistent expansion.
- VLD (Very Low Drag): Berger secant-ogive design for reduced drag and flat trajectory.
- Polymer Tip: Plastic tip that improves BC and triggers expansion on impact.
- Frangible: Sintered powder-metal bullet that disintegrates on hard impact; not for hunting.
Twist Rate & Bullet Weight
| Twist Rate | Stabilizes (approx.) | Common Use |
|---|---|---|
| 1:12″ | 150–180 gr | Standard hunting / general purpose |
| 1:10″ | 150–200 gr | Versatile hunting / target |
| 1:9″ | 150–220 gr | Long-range target |
| 1:8″ | 150–240 gr | F-Class / long-range |
If you plan to run 200 gr+ bullets, you need a 1:10 or faster twist. A standard 1:12 will not stabilize them reliably.
Real-World Uses
Hunting
This is the .308’s home turf. It is ethical on whitetail, mule deer, elk, and black bear with proper shot placement and a quality controlled-expansion bullet. Lighter 150–165 gr bullets suit deer; heavier 165–220 gr bonded, partition, or monolithic bullets handle elk and the largest game.
Ethical ranges: deer to roughly 300–400 yards, elk to roughly 250–300 yards with appropriate bullets. Many conventional soft points lose the ability to produce reliable hydrostatic shock below about 2,600 fps impact velocity, so bullet choice and range discipline matter. The high-BC 178 gr ELD-X and similar bullets extend that window, but wind past 650 yards makes clean kills difficult.
Legality note: Many states set a minimum caliber or bullet requirement for deer. Always verify your state’s current-year digest before hunting — regulations change annually.
Protection & Home Defense
Pros: full-power terminal performance, high capacity, fast follow-up with practice, and a proven military/LE pedigree.
Cons: over-penetration is the headline liability. The .308 carries substantially more energy than 5.56 or 9mm, so it passes through interior walls more readily and can put a round in the next room. Recoil is also meaningfully heavier than smaller defensive calibers, which can slow follow-up shots. If you run a .308 for defense, manage your backstop and choose barrier-predictable FMJ/OTM or moderate-weight expanding bullets.
Target & Competition
The .308 is a recognized platform in F-TR and PRS, and a favorite for long-range target shooting out to 800–1,000 yards. High-BC match bullets (175–178 gr) and fast twists make it a genuinely competitive long-range cartridge, not just a hunting round.
Other Uses
- Suppressed shooting: subsonic .308 loads exist for suppressed rifles to eliminate the sonic crack, though they trade away terminal energy.
- Reloading: one of the most popular bottleneck cartridges to reload, with abundant new and once-fired brass and published data from every major bullet maker.
- Designated marksman & sniper: the direct descendant of the 7.62 NATO that still serves in precision roles worldwide.
Honest Pros and Cons
Pros:
- Full-power performance from a short, light action
- Mild recoil for a full-power cartridge; superb accuracy
- Cheap, abundant ammo and excellent reloadable brass
- Huge bullet lineup for every job — match, hunt, defend
- Proven military and competition pedigree
Cons:
- Over-penetration is a real concern in home defense
- More recoil and blast than 5.56 or 6.5 Creedmoor
- Loses velocity faster than high-BC modern rounds at extreme range
- “Warrior cartridge” reputation understates it next to the .30-06 and magnums
Final Thoughts
The .308 Winchester is the do-it-all full-power cartridge that still does everything well. For hunting, it is ethical on deer and elk with the right bullet and honest range discipline. For defense, it is powerful but over-generous on over-penetration — manage your backstop. For competition, it is a legitimate long-range platform. Start with a quality 150–178 gr bullet from a name you trust, verify your state’s hunting regulations, and you will have a rifle that handles nearly any job you ask of it.
Ready to Make Your Move?
Whether you are building a long-range rig or stocking a deer rifle, the right .308 ammo and gear make the difference.
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Written by Nathan Grill — Firearms editor at Patriotic Firearms. Nathan covers the intersection of gun culture, Second Amendment law, and practical firearms advice for everyday American shooters.
