458 SOCOM vs. 45-70: Big Bore AR or Lever Gun?

By Chris Dwulet

Last Updated: Dec 26, 2025

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Chris Dwulet

Chris Dwulet grew up in the heart of the Midwest (Indiana, to be precise, a storied land which gave the world both the machine gun and the mechanical corn picker, thus solving two of mankind’s greatest age-old problems). He received his first experience with firearms in his grandfather’s backyard, where he learned to handle a Remington Model 541 with astounding deftness.

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The 458 SOCOM and 45-70 Government are two centerfire rifle cartridges that understand the meaning of “stopping power”.

Each firing a massive 0.458” diameter bullet, both rounds are more than adequate for taking down a herd of feral hogs, deer hunting in the back woods, and stalking the majestic plains buffalo.

Although the developments of these rounds were separated by over 125 years, the 458 SOCOM and 45-70 Government are incredibly similar in terms of ballistic performance. Your preferred round would ultimately come down to your preferred hunting rifle.

For lever-action rifle lovers, the 45-70 is gold standard for big game, while the 458 SOCOM is an excellent choice for those who want a big bore AR-15.

In this article, we will evaluate the 458 SOCOM vs. 45-70 Govt debate. By the end of it, you'll understand the differences between the two rounds, and have a clearer idea of which cartridge is better for your shooting and big game hunting needs.

What is the difference between 458 SOCOM and 45-70?

The biggest difference between the 458 SOCOM and 45-70 is the rifle used for each cartridge. The 45-70 is primarily a lever-action cartridge, whereas the 458 SOCOM is chambered in the AR platform.

Cartridge Specs

When comparing two cartridges, it’s good to begin with their physical specifications.

Perhaps the biggest difference between these two cartridges are the time periods when they were developed. The 45-70 was released shortly after the end of the American Civil War in the early 1870’s. The 458 SOCOM was developed in 2000, and released the year after.

The 45-70 Government was initially a black powder cartridge, and named in accordance with the rules of a now defunct nomenclature. The round's full name is 45-70-405:

• 45: Caliber of the 0.458” diameter bullet
• 70: Weight of the black powder charge, in grains
• 405: Bullet weight, in grains

The .45-70 was developed by the U.S. Army’s Springfield Armory for their new single shot Model 1873 rifle, which came to be known as the “Trapdoor Springfield”. The 45-70 has no parent case. It was a completely unique design.

Development of the 458 SOCOM began in 2000 in response to a conversation (supposedly at a barbecue) between Marty ter Weeme of Teppo Jutsu LLC and a member of the United States Special Operations Command (SOCOM) surrounding the ineffectiveness of the 5.56 NATO round during the Battle of Mogadishu.

Instead of using a unique case design, the 458 SOCOM's designer lengthend a 50 Action Express (50 AE) to 1.575” and gave it a slight shoulder.

The 458 SOCOM is one of several AR-15 rounds designed after the "thumper concept." The term was coined by American shooting icon Lt. Col. Jeff Cooper, who envisioned rounds that are (A) .44 caliber or larger, and (B) capable of taking down a 1,000-pound animal at 250 yards.

The three most popular thumper rounds are the 450 Bushmaster ammo, 458 SOCOM, and 50 Beowulf.

You'll notice immediate differences while looking at the cases for the 45-70 and the 458. The 45-70 utilizes the older straight-walled case designed for a lever gun. On the other hand, the 458 SOCOM case utilizes the more modern bottleneck design, which facilitates feeding in a semi-automatic and increases capacity for propellant.

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The 45-70 case is considerably longer than the 458's: 2.105”, as opposed to 1.575”. Cartridge overall length is also different: 2.550” maximum overall length for the 45-70, vs. 2.26” for the 458 SOCOM.

With a larger case comes increased case capacity. A larger case was needed for the 45-70's heavy charge of black powder. The advent of more potent smokeless propellant decades later would permit the design of cartridges with smaller, less capacious cases.

Although rarely filled to capacity, the 45-70 can hold 81.8 grains of water. The 458 SOCOM has a case capacity of 61.1 grains.

Another major difference is that the 45-70 has a rimmed case while the 458's case is rimless. A case rim provides a solid point of contact for a lever-action rifle's extractor, but is for the most part considered an impediment to the smooth operation of a semi-automatic .

The 458 case has a rebated rim, meaning its rim is narrower than its base. The 458 has a rim diameter of 0.473”, which is the same as the 308 Winchester, 30-06 Springfield, and 270 Winchester.

Although the cases of both rounds are very different, both fire the same 0.458” diameter bullets. This allows both rifle cartridges to fire extremely heavy projectiles. Bullets weighing 250 grains up to 500 grains are common for the 45-70. The 458 SOCOM can also fire these weights, plus heavier slightly heavier subsonic 600 grain bullets.

The most popular 45-70 factory ammo is typically loaded with 325, 350, 405, and 500 grain bullets, while 250, 300, and 350 grain bullets are the most popular for 458.

The final major difference between the 45-70 and 458 are their maximum chamber pressures. The 45-70 is a relatively low-pressure round by modern standards, with a maximum pressure of 32,000 psi per C.I.P. specs.

The 458 is not currently a SAAMI certified cartridge, so it does not have an official max pressure. Handloaders typically keep reloads within 35,000 psi for the 458, although this number should not be considered a published maximum. You should always follow published load data when reloading any cartridge.

Recoil

Recoil is an important consideration when purchasing a new rifle, as a round with heavy recoil will be more difficult to control and slow your rate of accurate follow-up shots. The potential for flinching is also an issue for cartridges with heavy recoil.

Felt recoil differs from shooter to shooter, and is dependent on firearm choice, stance, ammo, and the shooter's own subjective perception of pain. Free recoil, however, is an objective measure of how hard a cartridge kicks. It is determined solely by firearm weight, muzzle velocity, propellant charge weight, and bullet weight.

There’s no denying that these big bore cartridges have heavy recoil. With massive powder charges and heavy bullets, both cartridges can be a challenge to control for new shooters.

Which 45-70 load you pick will depend primarily on the rifle you plan on using, as newer production rifles like the Marlin 1895 Guide Gun can handle a lot more pressure than a surplus Trapdoor Springfield.

It is impossible to provide a true “apples-to-apples” comparison of these two rounds, as the firearms they are used in are completely different. For this comparison, we will consider the 458 SOCOM Wilson Combat Recon Tactical AR-15 weighing 6.5 lbs and the 45-70 Marlin 1895 Trapper weighing 7.1 lbs.

The rounds chosen for this comparison both come from Buffalo Bore. The 458 SOCOM has 300gr bullet and 1,900 fps muzzle velocity. The 45-70 has a 300gr bullet and 2,000 fps muzzle velocity.

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Given these rounds and rifles, the 458 SOCOM has 28 ft-lbs free recoil; the 45-70, 35 ft-lbs.

As the 458 SOCOM typically has a lighter propellant charge than the 45-70, it will have slightly less recoil when all other factors are the same.

Muzzle Velocity, Kinetic Energy, and Trajectory

The 458 SOCOM is often referred to as being equivalent to the 45-70 in an AR-15.

To evaluate these claims, we will compare four of the most popular factory loads on the market and see how they stack up against each other.

The rounds chosen for the 458 SOCOM are the Buffalo Bore 300gr TTSX and the Underwood Xtreme Hunter 250gr Xtreme Defense.

For the 45-70 we selected two moderate pressure loads that would be usable in most all modern lever-action rifles: Hornady LEVERevolution 325gr FTX, and Federal Fusion 300gr soft point.

In terms of muzzle velocity, all four rounds are roughly equivalent. The highest muzzle velocity belongs to the Hornady 325gr FTX for the 45-70 at 2,050 fps, with the 458 SOCOM 250gr Xtreme Defender bullet right behind it at 2,000 fps.

At longer distances, all four rounds approached subsonic speeds at roughly the same time. The speed of sound is 1,125 feet-per-second (fps). When a bullet's velocity transitions from super- to subsonic, the bullet picks up a wobble which greatly weakens its overall accuracy.

Both 458 factory loads were right at the supersonic limit when they passed 300 yards. The 45-70 loads were able to maintain supersonic flight slightly farther, but were well below the speed of sound at 400 yards.

In terms of muzzle energy, the 45-70 generally has more kinetic energy with modern loads than the 458 SOCOM. The Hornady LEVERevolution 325gr FTX load has the highest muzzle energy at 3,033 ft-lbs, followed by the 458 300gr TTSX load at 2,405 ft-lbs.

Note that 45-70 ballistics are highly dependent upon the load and rifle being used. Heavier magnum +P 45-70 loads from Buffalo Bore and other custom ammo manufacturers can easily exceed 3,600 ft-lbs muzzle energy, while Trapdoor-friendly ammo sits at around 2,400 ft-lbs.

The 325gr FTX 45-70 load has the flattest trajectory by a small margin, although all four loads are relatively comparable. The 45-70 325gr FTX load had -37” of bullet drop at 300 yards, while all other factory ammo ranged between -41” and -44”.

Ballistic Coefficient and Sectional Density

Ballistic coefficient (BC) is a measure of how aerodynamic a bullet is and how well it will resist wind drift. Sectional density (SD) is a way to evaluate the penetration ability of a bullet based on its weight and diameter.

In general, the bullets fired by the 45-70 are not very aerodynamic and therefore have low BC values relative to their weight. The main issue is that the 45-70 is typically fired from lever action rifles which utilize tubular magazines that store cartridges end to end. Bullets loaded in a lever-action rifle must therefore either have a flat nose, round nose, hollow point, or a supple polymer tip (à la Hornady LEVERevolution). If a pointed Spitzer-style bullet were loaded in a lever action, then it could ignite whichever primer its butts up against in the magazine, which can have disastrous consequences for the rifle (and whomever happens to be holding it).

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The 458 SOCOM can be loaded with pointed and more aerodynamic bullets, the 458 is constrained by the maximum overall length requirements of the AR-15 magazine. Maximum length for the 458 SOCOM is 2.260”, which mainly limits it to shorter, fatter, and overall less aerodynamic bullets.

Of the four factory loads detailed in the previous section, the 45-70 Federal Fusion 300gr round had the highest G1 BC at 0.290. The 458 250gr Xtreme Defender load had the lowest at 0.194.

For sectional density, the 45-70 have a slight edge, but it is unlikely hunters will be able to discern any difference between the rounds in terms of penetration.

The 45-70 325gr FTX had the highest SD: 0.221. The 458 250gr Xtreme Defender had the lowest: 0.170.

In general, both rounds have more than adequate penetration for whitetail, hogs, bears, and elk within their effective range.

Self-Defense/Suppressor Integration

One of the primary goals of the 458 SOCOM was to increase the lethality of the AR platform. It does this incredibly well, as it has essentially double the kinetic energy of the 223 Remington (223 Rem) at the muzzle.

The 458 was also optimized for use in a short barreled rifle (SBR), which has a barrel under 16" long. With a suppressor, an SBR will do much to conserve your hearing while you're firing indoors.

To put it bluntly, the 458 SOCOM was developed for use in close quarters battle (CQB) conditions, making it an excellent self-defense round.

This is not to say that the 45-70 can’t be used in self-defense. Many have done so to great effect. However, there is the concern of over-penetration when firing 45-70 high-power +P magnum loads. Furthermore, the report of a 45-70 indoors would be deafening to say the least.

On the other hand, a lightweight AR-15 makes for an extremely maneuverable weapons platform. Equip one with a suppressor and low power variable optic (LPVO) or red dot sight (RDS), and you’ve got a potent home defense weapon that is easier on the ears (when using subsonic rounds), allows extremely fast follow-up shots, and has the kinetic energy requisite for handling any would-be home invader.

The magazine-fed AR-15 also offers extremely fast reloads, while reloading a lever gun will take time that you might not have during a home defense situation.

Although the 45-70 is more than capable of handing bad guys of all sizes, the 458 SOCOM is clearly the better self-defense option thanks to its integration with the AR-15 rifle.

Hunting

While the 458 SOCOM might be an awesome home defense option, the 45-70 cannot be beat when it comes to big game hunting.

Thanks to the massive case capacity of the 45-70, ammo manufacturers and handloaders can produce low-recoil rounds for deer hunting and high-power magnum loads for larger game like elk, moose, and bear.

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There’s no big game in North America that the 45-70 hasn’t taken down. It is a cartridge that has survived the test of time.

This isn’t to say that the 458 SOCOM can’t take down big game. It has more than enough kinetic energy to do so. However, the slightly longer effective range of the 45-70 as well as the nostalgia factor of hunting with a lever-action rifle will maintain the 45-70's greater popularity for many years to come.

The 458 has gained a lot of footing is the hog hunting space, as the semi-auto capability of the AR-15 allows hunters to engage multiple targets with relative ease.

Both rounds make an excellent deer hunting option within their effective ranges. For the 458 SOCOM that is around 200 yards (depending on the load), and 300+ yards for the 45-70 Government.

Neither round is well suited for varmint hunting. They are overkill for small game like woodchucks or prairie dogs. For small game I’d recommend rounds like the 223 Rem or 22-250 Rem.

Ammo and Rifle Cost/Availability

The 45-70 has been around longer, and has many more fans than the 458 – two reasons why it's cheaper and easier to find.

All the major ammo manufacturers including Hornady, Federal, Winchester, Remington, Barnes, and Fiocchi have some variety of 45-70 available. Buffalo Bore offers multiple varieties of 45-70 Govt ammo that cover the entire spectrum of pressures available for the beloved black powder round.

In contrast, only a few ammo manufacturers offer 458 SOCOM, particularly Buffalo Bore, SBR, Underwood, and Black Butterfly. The 458 is not SAAMI certified – yet another reason why it is less popular than 45-70, as that has seriously hamstrung its growth. Ammo manufactures like Hornady and Winchester do not produce it.

In general, the 45-70 will have more new and used rifle options available. Both are primarily lever-action rifles, with some single shot Trapdoor Springfields still running around in the wild. (A few handguns, like the Bond Arms Cyclops and Magnum Research BFR, are available chambered for 45-70 as well.)

Any AR-15 could be a potential host for the 458 SOCOM. All that is required for conversion is a new bolt and barrel.

Sourcing a 458 SOCOM upper receiver can be a little tricky compared to other uppers like 300 Blackout or 6.5 Grendel. At the time of writing, only a few manufactures like Tromix, Radical Firearms, and Bear Creek Arsenal currently produce 458 uppers.

If you’re in the market for a fully assembled AR-15, then Wilson Combat, Rock River Arms, and Bear Creek Arsenal are the primary manufactures currently offering dedicated 458 SOCOM builds.

For bolt-action rifles, the 45-70 is your only choice. However, you’ll have to settle for an older Remington Lee contract rifle, and these are getting harder and harder to find.

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Reloading

Reloading is one method shooters use to reduce their overall cost per round and increase the consistency of their ammo to sub-MOA levels. Furthermore, handloads can be tailored to your rifle and to meet your specific shooting needs.

Handloaders have been tailoring 45-70 loads for over a century at this point, and this means there is a wealth of reloading data available for the cartridge. Even though it’s not SAAMI certified, there are still plenty of reloading recipes for 458 SOCOM as well. There are just more for 45-70.

Although both rifle cartridges fire the same 0.458” diameter bullets, hollow points are the only type of bullet both rounds can fire. This is due to the aforementioned tubular magazine issue with the 45-70. Most bullets fired by the 45-70 are flat- or round-nosed, while the 458 SOCOM typically fires pointed bullets.

Overall, more bullet options are available for the 45-70 thanks to its longstanding popularity in the big game hunting community.

For brass, the 45-70 continues its reloading dominance. Multiple manufacturers offer new factory brass, and countless bushels of once-fired brass are floating around on the secondary market.

Finding 458 SOCOM brass is more difficult in general. Although the 458 descended from the 50 AE case, normal 50 AE brass cannot be swaged into 458 SOCOM cases. This is because elongated 50 AE cases were used to create the 458 SOCOM, and adding brass to a case is incredibly complex.

Final Shots: 45-70 vs. 458 SOCOM

The 458 SOCOM and 45-70 Government are two centerfire rifle cartridges with incredibly similar ballistics, but which are fired from dramatically different firearms.

The 45-70 Government is one of the gold standard big game hunting cartridges that just refuses to die. “But is it better than a 45-70?” is the measuring stick used by numerous hunters. That has some merit, as the 45-70 Govt has harvested every game animal North America has to offer.

In contrast, the 458 SOCOM is a relatively new addition to the shooting world that drastically increases the stopping power of the AR-15 carbine. It has become wildly popular amongst hog hunters for its brutal terminal ballistics, as well as the incredibly fast follow-up shot capability inherent to the AR platform.

Deciding between these two rounds primarily centers around what type of rifle you want. For shooters who want the classic feel of a lever-action rifle, then the 45-70 is the obvious choice. However, if you prefer the semi-auto capabilities of the AR-15, then the 458 SOCOM has your back.

For a deeper dive into trajectory, velocity, and energy charts, see our full 45 70 ballistics guide. For the same on the SOCOM side, see our 458 SOCOM ballistics guide.

No matter which cartridge you choose, make sure you stock up on ammunition here at Ammo.com. I’ll see you on the range!

Written by

Chris Dwulet