All About Guns Ammo


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The 264 Winchester Magnum is a 6.5mm cartridge that was ahead of its time when created in 1958. It slipped into a coma in the mid-1960s and has been at death’s door ever since.

But it could revive, perhaps even thrive because it produces better ballistics than all but one or two of the current crop of 6.5mms.

Given today’s mania over all things 6.5mm, the 264 Winchester Magnum should be a top performer in these long-reach hunting rifles everyone seems to covet. This belted magnum cartridge bests the 6.5 Creedmoor by about 400 fps.

That’s like stepping from a 308 Winchester to a 300 Winchester Magnum in performance improvement. If you want a 6.5mm with flat trajectory, maximum power, and minimum wind deflection, you want a closer look at the 264 Win. Mag.

Photo shows several 264 Winchester Magnum cartridges atop a gray box of ammunition.
Winchester, alas, makes but one load for its under-appreciated 264 Winchester Magnum.

Despite it’s 21st century ballistic performance, the 264 Win. Mag. is old. Many would say doddering. They’d be wrong. With today’s powders and bullets, it could finally realize its rich potential. Before that can happen, however, more shooters need to understand the cartridge.

And more ammunition manufacturers need to begin loading to reach that potential. Currently Winchester doesn’t even come close, limiting its 264 Win. Mag. to just one load, a 140-grain Power Point (B.C. .384) at 3,030 fps. Nosler does a much better job with a variety of great loads featuring bullets from 100-grains to 140-grains. Hornady has one load pushing a 140-grain InterLock with a B.C. of .465.

This is an adequate start, but a good handloader will get the most from the 264 Win. Mag. because, ballistically, anything the 6.5 Creedmoor can do, the 264 Winchester Magnum can blow out of the water.

The quickest route to appreciating the 264 Winchester Magnum is through the 7mm Remington Magnum. Both cartridges were formed from the belted 375 H&H Magnum case.

You can nit pick and say it was the 300 H&H Magnum case, but that was itself squeezed down from the 375 case. What matters is the head diameter, that belt around it, and the basic body diameter. You can easily reshape the length, neck diameter, shoulder angle, and taper of a case, but not its head diameter.

See the family resemblance? The 264 Winchester Magnum may have been cut and squeezed to shape from a 300 H&H or 375 H&H, but it hardly matters. The belted head diameter is its foundation.

The belted .532-inch head of Holland & Holland’s 375 of 1912 is considerably wider than the .473-inch head of the 30-06 Springfield, which is what the 6.5 Creedmoor stands on. The 264 Win. Mag. case is .58-inch longer than the Creedmoor, too. It fits the same actions as the 270 Win. and 30-06. Bigger case, more powder… Boom. There you go.

Roy Weatherby mined this volume beginning with his 270 Wby. Mag. in 1943. Winchester came to the 375 belted magnum party in 1956 with the release of its 458 Win. Mag. They straightened the 375’s walls and cut its length to 2.5” for an easy fit into Model 70 magazines.

In 1958 they necked this big case down to create the 338 Win. Mag. and then necked it even smaller to make the 264 Win. Mag. Few hit the streets until 1959, but then…

When the 264 Winchester Magnum first appeared, Winchester’s ammo boxes looked something like this. Yeah, it’s an old cartridge.

Right away this “overbore” belted magnum created a stir. It came in a M70 Westerner rifle with a 26-inch barrel. Winchester advertised muzzle velocity at 3,200 fps with a 140-grain, .264” diameter bullet. SAAMI specifications for the cartridge allowed it a maximum pressure of 64,000 psi, same as the 300 Win. Mag. which came later.

Winchester is again chambering its CRF, Sporter M70 in 264 Winchester Magnum. I just wish they’d load high B.C. bullets. 

With these numbers, the 264 Winchester Magnum was the immediate long-range, high-velocity, flat-trajectory answer to the western hunter’s prayers. And it came in affordable M70 rifles. The cartridge and rifle enjoyed immediate success and everyone was happy until…

Remington unleashed its 7mm Rem. Mag. It was 1962, the same year the first Wal-Mart opened, John Glenn first orbited the Earth, Marylin Monroe died, and Decca Records turned down the Beatles.

Nobody appeared to turn down the 7mm Rem. Mag. Here was the same belted magnum case, same length, and same shoulder slope as the 264 Winchester Magnum. Just a slightly wider neck, one that would hold a .284” bullet. Subtract .264 from .284 and you enjoy a mere .020” diameter advantage with 7mm Rem. Mag. bullets.

Doesn’t seem like much, but Remington wisely offered its new 7mm magnum with bullets as heavy as 175-grains. To hunters familiar with 150- to 180-grain bullets in 270 Winchesters and 30-06 Springfields, that sounded like serious elk, moose, and bear medicine. Winchester’s heaviest (140-grain) .264 bullet didn’t quite match up.

It probably didn’t help that Remington was chambering its new 7mm in its equally new M700 rifle advertised as “the world’s strongest” (three rings of steel surrounded the cartridge head.) If you didn’t mind a push-feed bolt action, the 7mm Rem. Mag. was an easy pick. Throw in the more convenient 24-inch barrel of the 7mm and it was no contest.

If you can detect any dimensional differences between these cartridges other than neck diameters and bullets, you’re imagining things. Remington put the 264 Winchester Magnum out to pasture by mounting .284 bullets onto the same belted magnum case and calling it the 7mm Remington Magnum.

At about this same time so many bullets had already scorched the barrels of 264 Winchester Magnums that shooters began to notice early accuracy declines. Many were shooting the rifles fast and furiously at various rodents. After all, the 264 Win. Mag. could fire 85-grain hollow points 3,700 fps and 100-grain projectiles 3,600 fps.

With such light bullets, recoil wasn’t bad in an 8-pound rifle, just 15.4 f-p of free recoil energy compared to 20 f-p of punch with a 140-grain bullet. There’s nothing like blasting big doses of hot powder down a narrow bore in rapid succession to encourage throat erosion. The 264 Winchester Magnum got branded a barrel burner and was soon placed on life support.

But that was then and this is now. The incredible popularity of the 6.5 Creedmoor has inspired interest in any and all cartridges that spit a .264” bullet. Today we have the 26 Nosler and 6.5-300 Wby. Mag. Both of these burn much more powder in much larger cases than does the 264 Win. Mag. This gives them roughly a 100- to 150-fps muzzle velocity advantage over the 264 Win. Mag. But they also raise an important question…

If the 264 Winchester Magnum is a “barrel burner,” what should we call these larger cartridges? Barrel vaporizers?

While we are questioning speed, powder consumption, and barrel life, let’s address this issue with the 264 Winchester Magnum versus the 6.5 Creedmoor. One of the major selling points of the CM is its conservative consumption of powder and concomitant light touch on bores.

On average 6.5 CM barrels are supposed to maintain stellar accuracy through 2,000 to 3,000 shots, depending on the barrel steel and how “hot” the barrel was shot. In comparison some 308 Win. barrels have been reported to remain acceptably accurate for 5,000 shots, some 243 Winchesters just 2,000 shots, 25-06 Rems. 1,500 to 2,500 shots.

I’ve heard claims of 600 to 1,000 shots for the 26 Nosler, 1,000 to as many as 2,500 for 264 Win. Mags. This all varies depending on the barrel, whether it was cryo-treated, and how quickly subsequent shots are sent down the tube. The hotter you shoot them, the faster they deteriorate.

If the 264 Winchester Magnum was a barrel burner, imagine what the 26 Nosler in the middle might torch. Then think about necking that full-length 300 Wby. Magnum to fit the .264 bullets beside it and really frying some steel. Truth is, stainless steel barrels, cryo-treated and fired judiciously, reportedly retain hunting accuracy for 600 to as many as 1,500 rounds with these flame throwers.  Bullets are 140-gr. Berger VLD and Hornady 147-gr. ELD-X. 

Obviously, shooters must ask themselves what they value most in a rifle. If you want to shoot 20 rounds in a minute and 200 rounds in a day, you don’t want a fire-breathing magnum.

If you want the flattest trajectory, least wind deflection, and most downrange energy for terminating bucks and bulls, you do want the larger powder capacity magnum. One to three shots at game every few weeks each fall aren’t going to destroy rifle accuracy until you’ve put a decade or more of hunting behind you.

By then you should have saved up enough $ for a replacement barrel. They make those by the thousands. Someone once compared throttling back bullet speed to driving your truck 20 mph so the tires would last longer. 

Another consideration is how far you wish to target game and whether or not you use a laser rangefinder. Our ability to precisely measure distance-to-target contributes more to the success of long range shooting than the fastest magnum and highest B.C bullets.

What do we care if we dial an extra few MOA or select sub-reticle 6 instead of 4 to score on a long poke? Now, if you’re old school and like to hunt with MPBR, the flattest shooting magnum can make a big difference.

With a 6.5 Creedmoor sending a B.C. .529 bullet at 2,700 fps, you can aim dead center on a 10-inch target and hit it clear out to 334 yards. Send that same bullet 3,021 fps from a 264 Win. Mag. and you stay on target all the way to 372 yards.

By the way, all these 6.5mm cartridges shoot the same (.264”) bullets. The only differences among all them are powder capacity, head and body size, Cartridge Overall Length, and cost.

Go with the short ones if you find benefit in a short bolt throw and lighter, more compact rifle at lower cost per loaded box. Go with the long ones if you want maximum ballistic performance and hang the cost. Go small and short if you want long barrel life, big and long if you want  – you guessed it — maximum ballistic performance.

The good news about our 6.5mm cartridges is they all shoot those high B.C. bullets. You just have to decide how much powder you want to burn to do it. The old 264 Win. Mag. looks pretty middle-of-the-road compared to the little Creedmoor and oversized 26 Nosler

Stated another way, when shopping for ballistic performance in a 6.5mm hunting cartridge, the main thing to compare are average muzzle velocities with any bullet weight.

Today’s fashion is to fling the longest projectile with the highest B.C.s, so let’s compare some MVs using a reasonably high B.C. Nosler Custom Competition 140-grain match bullet. There are some 2- to 7-grain heavier hunting bullets out there, but this is close enough for consistent comparisons.

We will take this opportunity to gently chide our bullet makers to raise the weight limit on high B.C. .264-caliber bullets so we can enjoy the long range possibilities with our higher velocity 6.5mms. 

If they can stretch .284 (7mm) bullets to 180-grains, surely they can get .264s to 160-grains. In conformations like Berger VLD’s, Hornady ELDs or Nosler AccuBond LongRanges, B.C.s might approach an incredible .700.

But I’m a hunter, not a metallurgist/bullet maker. Perhaps they can’t draw jackets long enough for that. Longer bullets will require faster twist barrels. You might want to order your 264 Win. Mag. with a 1:8 or even 1:7 twist barrel. Sierra recently announced an exciting new 150-grain Hollow Point Boat Tail MatchKing.

It needs a 1:7.5 twist or faster. Matrix Ballistics recommends 1:8 twist for both its VLD 150-grain Match bullet and its 160-grain hunting bullet. Wait a minute! 160-grain? They can build one! And it’s rated B.C. .685. That would be one to try on a 264 Win. Mag. Serious elk, moose, kudu hammer.

Do be aware that some magnum 6.5 shooters are reporting extreme copper fouling with some bullets. They’re also seeing disintegration of light, thin-jacketed bullets at extreme velocities. When you start playing the extreme velocity game, you can find yourself skating thin ice. 

If you need to dial long distance, why not hire a service that will carry your call? 264 Win. Mag.

For comparison purposes, here are some popular 6.5 cartridges showing muzzle velocities with 140-grain bullet (B.C. 529) taken from Nosler Reloading Guide 7. Barrel lengths vary. All zeroed at 250 yards. 500-yard ballistic performance data includes 10 mph right-angle wind.

Other Reloading Guides may list different top end velocities. Recoil energies are calculated in an 8-pound rifle. Shooters should realize that these top MVs can vary as much as 100 fps from barrel to barrel, rifle to rifle, but this should provide a good basis for comparison.

Cartridge                    M.V.              500-yd drop “ /Drift “ /Energy fp.      Free Recoil Energy/fp

6.5 Creedmoor          2730                    -38/16.2/1252                                          12.34 fp

6.5×55 Swede            2790                    -36/15.7/1316                                           14.19 fp

260 Rem.                   2830                    -35.2/15.3/1359                                       13.24 fp

6.5-06                         2906                    -33/14.7/1444                                          14.59 fp

6.5-284 Norma         2953                    -32/14.4/1497                                          15.30 fp

6.5 PRC                      960                      -31.8/14.4/1505                                       16.96 fp

264 Win. Mag.          3021                    -30/14/1576                                              16.95 fp

6.5 Rem. Mag.           3059                   -29.6/13.7/1621                                        17.37 fp

26 Nosler                    3300                   -25/12.3/1918                                           26.25 fp

6.5-300 Wby. Mag.  3395                    -23.5/11.9/2041                                       26.40 fp

Some of today’s 6.5s: Grendel, Creedmoor, 260 Rem., Swede, 248 Norma, 6.5-280 Imp., 6.5 Rem. Mag., 264 Win. Mag. and 26 Nosler.

As always, burning ever more powder behind a given diameter bullet increases costs in ammo, recoil, noise, and barrel life. But it also maximizes ballistic performance.

It’s up to each individual shooter to determine what works for him or her. From where I sit, the old 264 Win. Mag. is starting to look like a pretty reasonable, middle-of-the-road cartridge in the 6.5mm cartridge line up.

If you’re not fixated on extreme barrel life, short-action rifles or joining the 6.5 Creedmoor flock, the under-appreciated 264 Win. Mag. might be your baby. Just don’t expect to find rifles or ammo on every corner or at discount prices. Check premium brands and semi-custom rifles like Fierce, Bergara, Rifles, Inc., Cooper, Hill Country Rifles, Bansner, etc.

The 264 Winchester Magnum is a cartridge  for serious riflemen/women who appreciate its power and reach in the pursuit of big game.

I wouldn’t call it a good option for plinking or high-volume target shooting. If I found a used rifle in good condition at a good price and it was chambered 264 Win. Mag., I’d probably buy it, especially if it was a pre-64 Winchester M70. (You can read about another great 6.5mm option, the 6.5-284 Norma, in this article. )

Much as author Ron Spomer admires the 6.5mm cartridges, he’s used them the least for his hunting. He hopes to change that over the next few seasons. 

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