The .45-70 Government

The .45-70 Government is a .45 caliber centerfire rifle cartridge that traces to the Model 1873 Springfield Trapdoor. Its original military name.45-70-405, meant a .45 caliber bullet, 70 grains of black powder, and a 405-grain bullet, according to Springfield Armory National Historic Site. Today it remains a modern hunting cartridge in lever-action rifles and single-shot rifles, but ammunition and load data must be matched to the firearm, because publishers divide .45-70 data into pressure levels for specific action types.

Origin: the Springfield Trapdoor and 1873 cartridge

Springfield Armory National Historic Site traces the Trapdoor rifle design to Erskine S. Allin’s hinged breech-block conversion at Springfield Armory. The armory explains that the hinged breech block was soon nicknamed the “trap door.”

The Model 1873 Springfield Trapdoor reduced the caliber to .45 inch and was made from new parts at Springfield Armory. Springfield Armory National Historic Site describes the new cartridge as the .45-70-405: .45 inch caliber, 70 grains of black powder, and a 405-grain bullet.

That is the meaning behind the old naming style. In modern catalog listings, the same cartridge family is usually shown as .45-70 Government.45-70 Govt, or 45-70 Government.

The Model 1873 Trapdoor was made in three size variations. Springfield Armory National Historic Site lists a 52-inch rifle for foot soldiers, a 41-inch carbine for mounted troops, and a 49-inch cadet rifle.

The Trapdoor series did not remain the standard U.S. service rifle forever. Springfield Armory National Historic Site states that the government replaced it with the Krag-Jorgensen in 1892, although many National Guard units still carried .45-70 Trapdoors in the Spanish-American War of 1898. The same agency says more than 500,000 Trapdoors were produced in .45 caliber.

What the .45-70 name means

The original .45-70-405 label is unusually useful because it tells you three things about the first cartridge form:

• .45: the caliber, as stated by Springfield Armory National Historic Site.
• 70: the black-powder charge weight in grains.
• 405: the bullet weight in grains.

Modern ammunition boxes usually do not include the final bullet-weight number as part of the cartridge name. Instead, they list the cartridge name and then the bullet weight separately, such as 300 grain, 325 grain, or 405 grain.

SAAMI dimensions and pressure specification

Published specifications are useful when comparing ammunition information, chamber specifications, and reloading manuals. They are not a substitute for the firearm maker’s instructions or a current loading manual.

Why .45-70 loads are split into pressure tiers

The .45-70 Government is different from many modern cartridges because the same cartridge name appears on ammunition and data for firearms that are not all built for the same pressure level. Hodgdon states that .45-70 data is divided into three divisions based on pressure levels for the intended firearms.

Hodgdon’s divisions are:

Hodgdon division	Intended firearms named by Hodgdon	Listed maximum pressure
Trapdoor Rifle	Springfield Trapdoor, Rolling Block, and antique replicas	28,000 CUP
Lever Action	1895 lever action Marlin only	40,000 CUP
Modern Rifles	Ruger No. 1 and No. 3 single-shot rifles, Browning 1885 single-shots, and Siamese bolt-action rifles	50,000 CUP

This is the central safety point for .45-70 owners: higher-pressure .45-70 ammunition or handload data is only for firearms rated for that pressure level. Hodgdon specifically says its Lever Action data is for the 1895 lever action Marlin only and not for firearms listed in the Trapdoor section. Hodgdon also says its Modern Rifles data must not be used in either the Trapdoor or Lever Action sections.

Speer also publishes separate .45-70 Government data labeled for Trapdoor Actions, Lever Actions, and Strong Actions. Speer warns that improper handloading practices can result in serious personal injury or property damage and tells users to refer to the current Speer Reloading Manual.

For factory ammunition, the same idea applies in plain language: read the ammunition maker’s firearm restrictions and the firearm maker’s manual before use.

Tubular magazines and bullet shape

Many modern .45-70 hunting rifles are lever actions with tubular magazines. Bullet shape matters in that format. Hodgdon warns not to use pointed bullets in any rifle with a tubular magazine unless the pointed bullet was designed with a collapsible tip made for tubular magazines.

Hornady’s .45-70 Government LEVERevolution load is an example of a factory load made for this issue. Hornady says its LEVERevolution FTX and MonoFlex bullets are safe to use in tubular magazines because of elastomer Flex Tip technology.

Federal’s HammerDown .45-70 Government load is also presented as a lever-gun cartridge. Federal says HammerDown ammunition is engineered for lever guns, functions in side-gate loading and tubular magazines, and was designed in partnership with Henry Repeating Arms.

Modern lever-action and single-shot use

The .45-70 Government remains available in current rifles. Marlin’s current SBL Series Model 1895 is chambered in 45-70 Govt, with a six-round capacity, 19.1-inch barrel, and 1:20 right-hand twist. Marlin says the Model 1895 has a six-round tubular magazine with a receiver loading gate and reliably feeds a wide range of .45-70 Govt factory ammunition and bullet types.

Modern ammunition makers also list .45-70 loads for hunting use. Federal offers its 300-grain HammerDown .45-70 Government bonded soft point load. Hornady offers a 325-grain FTX LEVERevolution .45-70 Government load.

Single-shot rifles are part of the modern .45-70 picture too, but the pressure tier still matters. Hodgdon’s Modern Rifles category is limited to the specific firearms it names: Ruger No. 1 and No. 3 single-shot rifles, Browning 1885 single-shots, and Siamese bolt-action rifles. Do not assume that every single-shot .45-70 rifle belongs in the same pressure category.

Published factory ballistics examples

Factory ballistics vary by bullet, load, and test setup. The following examples are manufacturer-published figures, not field results.

Load	Bullet	Manufacturer-published figures
Hornady LEVERevolution .45-70 Government	325-grain FTX	Hornady lists 2,000 fps and 2,886 ft-lb at the muzzle from a 24-inch test barrel. Hornady states this load is not recommended for use in handguns or revolvers.
Federal Premium HammerDown .45-70 Government	300-grain bonded soft point	Federal lists 1,850 fps muzzle velocity, 2,280 ft-lb muzzle energy, and 1,307 ft-lb at 200 yards.

These examples show why the cartridge is still relevant to lever-action and single-shot hunters. They also show why the label “.45-70 Government” by itself is not enough information. Bullet weight, bullet construction, published pressure category, firearm rating, and magazine type all matter.

Practical checklist for .45-70 hunters

Before using any .45-70 ammunition or handload data, check:

• The exact firearm model and the manufacturer’s manual.
• Whether the ammunition maker lists any firearm restrictions.
• Whether the data is for Trapdoor, Lever Action, Modern Rifle, or another clearly named category.
• Whether the rifle has a tubular magazine.
• Whether the bullet style is appropriate for that magazine type.
• Current, official loading data if handloading.

The .45-70 Government has a long history, from the Springfield Trapdoor to modern lever guns and single-shots. Its age is part of the appeal, but it is also why careful pressure matching is essential. Confirm current ammunition restrictions with the ammunition maker, confirm firearm suitability with the firearm maker, and use only current published data for the exact firearm category.