The Top Reasons to Own a Classic 7x57 Mauser

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Many cartridges are called “classic.” While this term is sometimes overused, rounds with a long and distinguished history in combat and in the hunting fields deserve the title. The .28-caliber round we know as the 7x57mm Mauser certainly qualifies as a classic. It was developed by the Germans in 1892 for the military Mauser Models 1893 and 1895, and the cartridge has been used on big game worldwide with much success. Fun fact: In Europe, it’s known as the .275 Rigby.

Famous big-game and dangerous-game hunters have used the 7x57 Mauser, namely, W.D.M. “Karamojo” Bell, Jim Corbett, and Jack O’Connor. Elephants, leopards, and desert bighorn sheep all fell to the 7x57 Mauser in the hands of those famous hunters. O’Connor famously stated, “The little 7x57 cartridge is an excellent all-around cartridge, one with light recoil, excellent accuracy, and a trajectory adequately flat for 95 percent of all sheep hunting.” And the great Bob Hagel also used the 7x57. He lamented that it was underloaded, but that handloading could solve that problem. How right he was because new high-tech bullets and new powders breathe new life into this fine classic.

Today, the velocities of most factory hunting ammunition are modest due to the relatively low maximum average pressure (MAP) of 51,000 psi, but for medium-size big game, these loads are quite suitable. Ammo in Europe is loaded to somewhat higher pressures. Most of today’s factory ammunition is loaded with 140-grain and 150-grain bullets, but the 7x57 can also use heavier 175-grain bullets. Unfortunately, not many new rifles today are chambered for the 7x57. Such was not always the case.

A Special Rifle

My association with the 7x57mm Mauser began innocently in 1979 as I was perusing the Interarms catalog (this was before the days of internet and websites). Interarms was a prominent importer of various firearms from 1956 to1999. Centerfire rifles included several iterations of what Interarms called the Mark X line, made by Zavodi Crvena Zastava in Kragujevac, Yugoslavia. This firm was founded in 1853.

These rifles had typical Mauser Model 98-style actions, and company literature stated that the actions were designed and produced expressively for Interarms and that they were a “precision Mauser action.” The Mark X line included the Viscount, a traditional bolt action with a Monte Carlo walnut stock; the Cavalier, which had a roll-over cheekpiece and a rosewood fore-end tip; and three models with unique full-length stocks. The Mannlicher-style Carbine had a 20-inch barrel and was otherwise similar to the Cavalier. The Marquis featured an adjustable trigger. And the stylish Continental Carbine had a European-style double-set trigger. As Festus from the Gunsmoke TV series would say, “It was quite looksome.”

I was smitten with the Continental Carbine at first glance. I liked the looks of its full-length stock and cute butter-knife bolt handle, and the double-set triggers put it in a class by itself. It was classic in style and classic in chamberings (including the historically famous 7x57mm Mauser), so I called my local dealer and ordered one in 7x57 right away.

After receiving my rifle, with a little research, I learned that it was made in 1978. I mounted a Leupold 4X Compact scope on it, and the rig weighs 8 pounds, 9 ounces. It is just 41 inches long. The 203/16-inch barrel mikes 0.553 inch at the muzzle and 1.132 inches at the receiver ring. The barrel has four-groove rifling with a steep 1:8.75-inch twist, in deference to the length and velocity of the 175-grain bullets of the 7x57 military ammo.

The Mark X Continental Carbine’s stock is made of European walnut. It has no Monte Carlo comb, but it sports a sleek cheekpiece and skipline checkering. A metal cap holds the end of the full-length stock to the barrel’s muzzle.

The 7x57 cartridge’s traditional rimless case is rather pedestrian by today’s “short and fat” standards. It is 2.235 inches long, and the rim diameter is 0.473 inch, the same as .270, .30-06, .308, and a host of other cartridges, including the .257 Roberts and the 6mm Remington, both of which are based on the 7x57 case necked down. The shoulder angle of the 7x57 is a modest 20 degrees.

I got along fine with the little carbine but made a couple of alterations. I replaced the double-set trigger with an adjustable one from the now-defunct M.H. Canjar Co. of Denver. I adjusted it down to 2 pounds, and accuracy improved markedly. The metal cap at the end of the stock didn’t seem to harm shootability of the rifle at all, but the recoil seemed sharp, so I had a gunsmith add a Pachmayr No. 325 Deluxe recoil pad.

Handload Components

Building tailor-made handloads for the 7x57 is a shooter’s delight. Cases are easy to resize, several powders work well in them, and there are scads of suitable 0.284-inch bullets. The only quirk with my Mark X rifle is that it has a very long throat. The old axiom of seating bullets with a 0.010-inch jump to the rifling is not possible with this rifle.

Maximum overall cartridge length listed by SAAMI is 3.065 inches, and the magazine length of the Mark X is approximately 3.40 inches, so there’s plenty of room, but for good bullet tension, I seat bullets so their bases are even with the start of the case neck. This results in a bullet jump that even Roy Weatherby would think is excessive. With some experimenting, satisfactory loads can be developed.

I use mostly standard Large Rifle primers for my handloads, but I have tried a couple of loads with Federal Magnum No. 215 primers just to see if that produced lower standard deviations. Spoiler alert: It didn’t.

The size and shape of the 7x57 case make it suitable for a host of powders, and while many powders will work, the slower- burning ones seem best. One can hardly go wrong with IMR 4350 and IMR 4831 in many game rounds. StaBALL 6.5 is also a winner, as is IMR 4955. Both have the delightful advantage of what Hodgdon calls “copper erasing pixie dust” in them. Additional propellants that work well are H414, Hunter, and Norma MRP.

Range Results

I fired a total of 14 handloads and three factory loads for this report and achieved good results. The average group size for five-shot groups at 100 yards for all 17 loads was 1.16 inches.

While roundnose bullets are out of favor these days, one of my favorites is the Hornady 154-grain InterLock RN. With 49.0 grains of Reloder 19, its velocity was a modest 2,438 fps, but the group was a tight 0.89 inch.

High-tech bullets shot well, too. Hornady’s 150-grain ELD-X liked IMR 4955. A charge of 47.3 grains produced a speed of 2,671 fps and a group of 1.09 inches. The Barnes 140-grain TSX with 48.0 grains of IMR 4350 clocked 2,612 fps and produced a 1.03-inch group.

Admittedly, my 7x57 carbine with its 4X scope is not a match gun, but the Sierra 130-grain HPBT Match bullet over 45.0 grains of H414 made 2,601 fps and the second smallest group of them all. It was 0.63 inch. The accuracy winner was the Speer 145-grain Hot-Cor SP, which is a darn good game bullet, with 55.0 grains of VV N150 at 2,685 fps and a group of 0.50 inch.

I must report that with long bullets at modest velocities, stabilization can be a problem. I encountered this with three experimental loads. Note that I did not include this information in the accompanying chart. The Swift 175-grain A-Frame bullet is 1.359 inches long. With a charge of 42.0 grains of StaBALL 6.5, the velocity was 2,163 fps, and the bullet holes in the target showed evidence of tipping (group size was 2.95 inches). The Sierra 165-grain GameChanger SBT, which is 1.510 inches long, over 44.5 grains of StaBALL 6.5 produced a velocity of 2,490 fps, and its 2.95-inch group also showed signs of bullet tipping. The Sierra 160-grain SBT is 1.256 inches long, and though it did not show signs of tipping, the bullet holes were unacceptably far apart (2.16 inches). For this, it is probably wise to limit bullet weights to 150 grains or less.

One last note regarding handloading the 7x57, as the Speer Handloading Manual Number 15 points out, “The 7mm Mauser is not a magnum and should not be expected to deliver magnum ballistics.” Good advice.

My experience with the 7x57 on game is limited, but both instances are, well, illustrative.

You are probably expecting tales of derring-do against 10-point bucks, 6x6 elk, and such.  Well, I hunted elk and deer with the 7x57, all right. I did not get an elk or mule deer with it, but I did score game.

One October afternoon, my wife and I were walking along a Colorado mountainside, in search of elk. None were to be found. I did, however, flush a fat blue grouse. It lit about 50 feet high in a pine tree. Blue grouse are delicious, and rifles were legal on grouse, so I figured on picking his head off with the 7x57. I aimed carefully and fired. A miss. I fired again; another miss. (I could have sworn that the grouse jerked his head to the side as the bullets passed by.) It occurred to me that I might ought to conserve my limited supply of ammunition, in case an unsuspecting ungulate strolled by, but I decided to give it one more shot. I aimed at the middle of the grouse and fired. Direct hit. The grouse exploded in a cloud of feathers. The wings wafted down through the branches. The coveted breast meat was apparently vaporized. All I found was a leg. Even the gravy was tough.

My luck on deer was better. After moving from Colorado to a farm in Missouri, I learned that whitetails were all over the place, and we landowners could hunt them with a free license from the State Greenies. I had the Mark X sighted-in with a handload of Speer 145-grain bullets at about 2,500 fps. The first three days of the season I saw no deer. On the fourth day, it was cold, and I decided to give the deer the day off and slept in. My wife, however, was out on the patio, looking for deer as I slept. Soon she came in blathering about “all the shots nearby,” and that I should “get up and look for a deer!” So I dragged myself out of bed, donned my slippers, robe, and orange vest and cap; grabbed the Mark X; and stepped into the yard. I headed toward the garden, frozen snow crunching under my cold feet. At first I didn’t see any deer, but soon to my right, I heard the “crunch, crunch, crunch” of deer hooves in the snow. A plump 6-point buck ambled into view about 75 yards away. I threw the rifle to my shoulder, aimed, and fired. The buck ran a few steps and collapsed. I had to get dressed in order to dress the deer.

I still have the Mark X; it is a fine little rifle and a great game gun. It’s a real classic. Sure, I have dabbled with other 7x57mm Mauser bolt-action rifles, but none have produced the pleasure of working up handloads and the general pride of ownership like my Interarms Mark X. I like this old, tried-and-true classic rifle. And I really like the classic 7x57mm Mauser cartridge, too. I think everybody should have at least one 7x57mm Mauser. Don’t you? 

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