Can You Safely Shoot 7.62 NATO in a .308 Rifle?

Feed 7.62 NATO Rounds Into Your Modern .308 Rifle Without Worry

You can safely load and fire 7.62 NATO ammunition in almost any modern rifle built for .308 Winchester. Both rounds share the exact same external dimensions across every critical surface. The bullet diameter measures .308 inches, the case taper is identical, and the shoulder angle matches down to the millimeter. When you drop a clean military round into a commercial rifle, it chambers smoothly and locks into battery just like standard sporting ammunition.

The shared heritage between these two cartridges explains why they fit so well together. Winchester introduced the commercial .308 Winchester hunting cartridge back in 1952, adapting experimental designs that the military was developing for infantry service. Two years later, the military officially adopted that same cartridge shape as the 7.62x51mm NATO service round. Because the civilian version and the military design grew up side by side, their outer shapes match almost completely.

A modern bolt-action or semi-automatic sporting rifle from a reputable manufacturer comes from the factory built with tough steel components. The barrel, receiver, and locking lugs on modern firearms handle extreme forces without breaking a sweat. Commercial sporting chambers are designed to withstand high operating pressures day after day. Running military surplus through your sporting rifle will not blow out the barrel or crack your bolt face.

Shooters often find sealed cans of surplus ammunition at gun shows or online retailers for a fraction of the cost of commercial hunting rounds. If you picked up an ammo can of military rounds to save money at the shooting range, you do not need to let those boxes gather dust. Your modern .308 rifle will cycle them reliably, feed them cleanly from the magazine, and put rounds downrange without causing structural damage to your firearm.

Compare Chamber Pressure And Metal Thickness Before You Load

The primary concern most shooters have when mixing these rounds involves firing pressure (the push of expanding gas when a round fires). Many people assume that military ammunition must be hotter and more dangerous than commercial sporting ammo. In this case, the opposite is true. Commercial .308 Winchester cartridges are actually loaded to higher firing pressures than military surplus ammunition.

The Sporting Arms and Ammunition Manufacturers' Institute sets commercial guidelines for firearm safety in the United States. Under these standards, commercial .308 Winchester has a maximum average firing pressure limit of 62,000 PSI (pounds per square inch). Military specifications for 7.62 NATO rounds, by comparison, typically limit firing pressure to around 50,000 to 58,000 PSI. Because your commercial .308 rifle is built to contain higher pressures, shooting a lower-pressure military round actually places less physical stress on your barrel and receiver.

The real physical difference between these two rounds lies in the casing (the empty metal shell that holds the powder). Military ammunition is designed for battlefield durability. Service weapons, such as fully automatic squad machine guns, have violent extraction systems that grab the shell rim and rip it backward at high speed. To prevent the shell from tearing apart during rapid fire, military factories make the brass casing noticeably thicker, especially around the base and lower sidewalls.

Commercial sporting brass has thinner sidewalls because bolt-action hunting rifles extract spent rounds smoothly and gently. Because military brass is thicker on the inside, it contains slightly less interior volume for propellant powder. Military armories balance this smaller space with specific gunpowder burns to keep velocity consistent while keeping firing pressure comfortably below commercial maximums.

Set Realistic Target Expectations And Sort Your Empty Brass Carefully

While military surplus ammunition is safe to shoot in your .308 rifle, you should adjust your expectations regarding accuracy. Factory hunting ammunition and precision match cartridges use finely balanced bullets with consistent weights, polished tips, and uniform powder charges. Builders tune those rounds to help your rifle punch tight, overlapping cloverleaf patterns into paper targets at long range.

Surplus 7.62 NATO rounds are manufactured for combat utility, where hitting a silhouette target at standard engagement distances matters far more than tiny groups. Most military ammunition uses basic full metal jacket bullets. Mass production across millions of rounds leads to slight variances in bullet weight, copper jacket thickness, and gunpowder volume from one round to the next.

At one hundred yards, a quality hunting rifle that shoots one-inch groups with match ammunition may shoot two-inch or three-inch groups with surplus military rounds. That level of precision is great for hitting steel gongs, practicing position shooting, or casual weekend plinking. However, you should never use bulk full metal jacket surplus for hunting big game. These non-expanding bullets punch narrow holes through game animals without creating the rapid energy transfer required for a clean, humane harvest.

If you save your spent brass to handload your own custom ammunition, military casings demand extra preparation time at the workbench. Many foreign surplus rounds feature Berdan primers (an older ignition system that uses two tiny flash holes off-center). Standard commercial reloading dies use a single central pin designed for Boxer primers, and trying to punch out a Berdan primer will instantly snap your decapping pin.

Even when military casings use single-hole Boxer primers, military factories swage or crimp the primer into the pocket with a ring of stamped brass. You must ream or swage this metal crimp away with a cutting tool before a new primer will slide into place. Remember that thicker brass walls leave less room inside the case, so you must reduce your powder charge slightly to prevent sudden spikes in firing pressure.

Never Fire Commercial .308 Hunting Rounds In Vintage Military Rifles

Shooting 7.62 NATO in a .308 rifle is completely safe, but trying to do the reverse can create genuine safety hazards. Loading modern, hot commercial .308 hunting rounds into an older military surplus rifle chambered in 7.62 NATO is something you should avoid. This warning applies directly to vintage battle rifles, such as surplus FN FALs, CETME rifles, or older military-pattern surplus arms.

The danger comes down to chamber fit (how snugly the cartridge sits inside the barrel, technically called headspace). Military armories intentionally cut the chambers of combat rifles slightly longer and roomier than commercial sporting chambers. This extra breathing room ensures that a combat rifle still feeds and closes its bolt even when the action is full of carbon buildup, dust, mud, or field grime.

When you insert a commercial .308 cartridge into a loose military chamber, the thinner commercial brass must stretch significantly outward and forward to fill the void during firing. At the same moment that the thin brass stretches, the commercial powder charge generates up to 62,000 PSI of firing pressure. That combination of higher pressure and excessive case stretch can push the brass beyond its physical limit.

If the casing gives way, it usually suffers case head separation, where the rear rim tears away from the body of the shell. Scorching gases and burning powder granules escape backward into the rifle receiver. That blast can shatter wooden rifle stocks, launch metal fragments into the air, or cause severe facial injuries to the shooter. If you own an authentic military rifle chambered in 7.62 NATO, have a qualified gunsmith check the chamber fit with precision steel headspace gauges before you ever fire commercial hunting cartridges through it.

Inspect Every Surplus Round Before You Slide It Into The Magazine

Surplus ammunition can sit inside military storage bunkers or shipping containers for decades before reaching civilian store shelves. Much of this ammunition remains in pristine condition, but poorly stored crates can suffer from moisture damage and physical degradation. Take a few minutes to examine your surplus rounds before loading them into your firearm.

• Look for green corrosion and chalky buildup: A light, dull brownish tarnish on brass is harmless surface oxidation. However, crusty green verdigris, heavy white chalking, or deep rust pits on steel-cased ammo can bind inside your rifle chamber, causing stubborn extraction jams or torn rims.
• Check the bullet seating depth: Stand several cartridges on a flat tabletop and compare their heights. If you notice a bullet pushed noticeably deep into the casing, discard that cartridge. A bullet pushed into the case compresses the gunpowder, which can generate dangerous firing pressure when the primer ignites.
• Examine the headstamp markings: Turn the casing over and inspect the stamped markings on the flat metal base. Authentic NATO ammunition typically features a circle with a cross inside it, signifying that the round meets standardized military specifications. Avoid unmarked cartridges, hand-packed baggies, or mystery reloads bought from unknown sellers.
• Store your ammunition behind secure locks: Keep your bulk ammunition stored in clean, airtight metal cans with healthy rubber seals to block out humidity. Always keep bulk rounds and firearms locked away from children, curious visitors, or unauthorized hands. Upgrading your rifle cabinet with an electronic gun safe lock gives you fast access with a personal code while maintaining strict home safety.
• Feel the bolt resistance when chambering: When you cycle your bolt forward on a surplus round, the handle should close smoothly with minimal hand pressure. If the bolt handle feels unusually stiff or refuses to turn down completely, never force it closed. Open the action, remove the round, and inspect both the cartridge and the chamber for dirt, metal shavings, or foreign debris.

FAQs

Does shooting 7.62 NATO wear out a .308 barrel faster?

Shooting standard copper-jacketed 7.62 NATO ammunition will not wear out your barrel any faster than shooting standard commercial rounds. In fact, because 7.62 NATO runs at a lower firing pressure, it is slightly gentler on your rifle's chamber and barrel throat. Just keep an eye out for surplus rounds that use bi-metal jackets containing mild steel, as high volumes of steel-jacketed bullets can wear rifling grooves down faster over several thousand rounds.

Can I hunt deer with military surplus 7.62 NATO ammo?

You should not use surplus military 7.62 NATO ammunition for deer hunting or any other big game pursuit. Most military surplus rounds carry full metal jacket bullets designed not to expand when they hit a target. These bullets pass straight through game without creating wide wound channels, leading to wounded animals and lost game. Always choose dedicated expanding soft-point or polymer-tipped .308 Winchester ammunition for ethical hunting.

Why is 7.62 NATO usually cheaper than commercial .308 Winchester?

Military ammunition is produced in massive government production runs of tens of millions of rounds at a single time. Government contracts keep manufacturing costs low by using simple full metal jacket projectiles and plain cardboard packaging. Commercial .308 Winchester ammunition uses intricate expanding bullet designs, highly polished brass, and tighter quality control steps, which increases the retail cost on store shelves.

What should I do if a surplus round fails to fire?

Keep your rifle pointed in a safe direction downrange for at least thirty seconds in case the round has a delayed ignition hangfire. After waiting, open the bolt to eject the unfired cartridge onto the bench or ground. Examine the primer on the back of the shell to see if your firing pin left a deep, centered dent, which indicates a dead surplus primer that should be safely discarded.