Best Bullets for 45-70 Government Reloads: A Guide

The 45-70 Government is one of the most versatile cartridges in American shooting history, and nowhere is that versatility more obvious than in bullet selection. From lightweight 255-grain cast lead plinkers to 500-grain monolithic solids built for stopping dangerous game, the range of projectiles you can load into this cartridge is staggering. But that breadth of choice also means you need to be deliberate about what you put in your cases – the wrong bullet in the wrong rifle can damage your gun or produce dangerously high pressures.

This guide walks through the major bullet categories for 45-70 reloads, organized by construction type and intended use. Whether you are loading mild Trapdoor-safe rounds for a weekend cowboy match or assembling serious hunting ammunition for elk and grizzly country, the right bullet is the foundation of every good 45-70 handload.

Quick Takeaways

• Standard bullet diameter is 0.458 inches – slug your bore before buying bulk bullets
• Cast lead bullets are the backbone of 45-70 reloading, especially for Trapdoor rifles
• Lever-action rifles with tube magazines require flat-nose or round-nose bullets for safety
• Heavier bullets seated deeply reduce powder capacity and raise pressure – always work up loads when changing bullet weight
• Premium controlled-expansion and monolithic bullets turn the 45-70 into a legitimate dangerous game cartridge in modern actions

Choosing the Right .458 Bullet Diameter

The standard bullet diameter for the 45-70 Government is 0.458 inches. This is what you will find from every major manufacturer, and it is the correct starting point for any reload. However, not every 45-70 bore is created equal. Older rifles – especially original Trapdoor Springfields and some early production lever guns – may have bores that measure 0.459 inches or even slightly larger due to manufacturing tolerances or decades of use.

The only reliable way to know your bore is to slug it. Push a soft lead slug through the barrel with a dowel, measure it with a micrometer, and use that measurement to guide your bullet purchases. If your bore runs 0.459 inches, cast bullet suppliers often offer that diameter. Shooting undersized bullets in an oversize bore leads to poor accuracy, gas cutting, and excessive leading. A few minutes with a slug saves you hours of frustration at the loading bench.

Cast Lead Bullets for Trapdoor and Beyond

Cast lead bullets are not just an option for the 45-70 – they are its heritage. The cartridge was designed around a 405-grain lead bullet in 1873, and cast lead remains the safest, most affordable, and most historically appropriate choice for Trapdoor Springfield rifles. Jacketed bullets should not be used in Trapdoor actions. The combination of harder jacket material and the metallurgy of these 150-year-old rifles creates unnecessary bore wear and potential safety concerns. Stick with cast lead at Trapdoor pressure levels (roughly 18,000 PSI max).

Bullet hardness matters enormously in cast lead performance. Softer alloys in the range of 8-12 BHN work well for low-pressure Trapdoor loads, while harder alloys of 16-22 BHN are better suited for lever-action and modern single-shot pressures. Gas checks – small copper cups that fit the base of the bullet – become important once you push cast bullets above about 1,400 fps, as they prevent hot gas from melting the bullet’s base and causing leading. For serious cast bullet shooting, look for suppliers who offer properly sized, gas-checked designs in weights from 300 to 500 grains.

Quick Checklist for Cast Lead Bullet Selection

• Slug your bore to confirm 0.458-inch or 0.459-inch diameter
• Match alloy hardness (BHN) to your pressure tier
• Use gas-checked designs above 1,400 fps
• Choose plain-base bullets for mild Trapdoor loads
• Ensure flat-nose profile if loading for a tube-magazine lever gun
• Lube grooves should be fully filled – dry lube grooves cause leading
• Buy from reputable cast bullet suppliers who hold tight diameter tolerances

Best Jacketed Flat-Nose Bullets for Lever Guns

If you shoot a lever-action like the Marlin 1895 or Henry 45-70, flat-nose bullet profile is not optional – it is a safety requirement. Pointed or spitzer bullets in a tube magazine can cause a primer strike from recoil, which means a catastrophic chain detonation. Every bullet you load for a tube-fed rifle must have a flat or rounded nose. Fortunately, several manufacturers produce excellent jacketed flat-nose (JFN) and hollow-point flat-nose (HPFN) bullets specifically designed for this application.

For deer and hog hunting out of a lever gun, jacketed flat-nose bullets in the 300 to 350-grain range are outstanding performers. They offer reliable expansion at the moderate velocities typical of lever-action 45-70 loads – generally 1,600 to 1,900 fps. Hornady’s FTX bullets (loaded in their LEVERevolution factory ammo) are also available as components and use a flexible polymer tip that is safe in tube magazines while improving ballistic coefficient. When shopping for jacketed lever-gun bullets, look for designs that specify reliable expansion at velocities below 2,000 fps, since that is the reality of most 45-70 lever-action trajectories.

Heavy Hitters for Big and Dangerous Game

This is where the 45-70 earns its reputation as a serious working cartridge. In a strong modern action – a Marlin 1895, Ruger No. 1, or similar platform rated for higher pressures – heavy bullets in the 400 to 500-grain range transform the old government round into a legitimate dangerous game tool. Premium controlled-expansion bullets like the Swift A-Frame and Woodleigh Weldcore in 0.458-inch diameter deliver deep, straight-line penetration on elk, moose, and large bear. Barnes TSX and similar monolithic copper bullets offer near-100% weight retention, which is exactly what you want when the animal can hurt you back.

Penetration matters more than expansion at these bullet weights. A 500-grain hard-cast lead bullet at 1,500 fps from a modern lever gun will punch through heavy bone and reach vitals from angles that would stop lighter, faster expanding bullets. For grizzly defense loads and African game, hard-cast bullets with a wide flat nose (meplat) in the 20+ BHN hardness range are the standard. One critical note: heavier bullets seated to proper overall length displace significantly more powder space inside the 45-70’s large case. Moving from a 300-grain bullet to a 500-grain bullet with the same powder requires a completely new load workup. The pressure increase from reduced case volume is real and dangerous if ignored.

Seating Depth and Pressure

When you seat a long, heavy bullet deeply into the 45-70 case, you reduce the available volume for powder. This compressed space raises pressure even if the powder charge stays the same. Always consult current load data for the specific bullet weight you are using. Never assume that a safe charge for a 300-grain bullet is safe for a 500-grain bullet – it almost certainly is not.

Common Mistakes in 45-70 Bullet Selection

Even experienced reloaders make errors when working with the 45-70, largely because the cartridge spans such a wide range of rifles and pressure levels. Here are the most common mistakes to avoid:

• Using jacketed bullets in a Trapdoor Springfield – these rifles were designed for lead projectiles at low pressure. Jacketed bullets increase bore wear and can produce unsafe pressures in antique actions.
• Loading spitzer or pointed bullets for a tube-magazine lever gun – this is a serious safety hazard. Always use flat-nose or polymer-tipped designs rated safe for tube magazines.
• Not slugging the bore before buying bullets – a 0.458-inch bullet in a 0.460-inch bore produces poor accuracy and leading. Know your bore diameter.
• Swapping bullet weights without adjusting the powder charge – a charge that is safe with a 300-grain bullet can be dangerously over-pressure with a 500-grain bullet due to reduced case volume.
• Choosing bullets that need high velocity to expand, then loading them at lever-action speeds – many jacketed bullets require 2,000+ fps for reliable expansion. At 1,600 fps, they may pencil through without opening. Match bullet construction to your actual velocity.
• Ignoring bullet hardness in cast lead loads – too-soft alloys at high velocity lead the bore badly; too-hard alloys at low velocity do not obturate to seal the bore. Match hardness to pressure.

FAQ – Best Bullets for 45-70 Government

Can I use the same bullet in a Trapdoor Springfield and a Marlin 1895?

You can use the same cast lead bullet in both, but you must use completely different powder charges. Trapdoor loads are limited to roughly 18,000 PSI, while a Marlin 1895 can handle significantly more. The bullet may be the same, but the load behind it must match the rifle.

What is the best all-around bullet weight for 45-70?

The classic 405-grain cast lead bullet remains one of the most versatile choices. It works at Trapdoor pressures for target shooting, performs well on deer and hog at moderate velocities, and can be loaded hotter in modern actions for larger game. It is the do-everything weight for this cartridge.

Do I need gas checks on my cast bullets?

If you are pushing cast lead bullets above roughly 1,400 fps, gas checks significantly reduce leading and improve accuracy. Below that velocity – typical of Trapdoor and light target loads – plain-base bullets work fine and are simpler to load.

Are monolithic copper bullets worth the cost for 45-70?

For dangerous game and large bear, yes. Monolithic bullets like the Barnes TSX retain nearly all their weight on impact, providing deep penetration through heavy bone and muscle. For deer hunting or target shooting, they are overkill and cast lead or standard jacketed bullets are more cost-effective.

What overall length should I load 45-70 cartridges to?

This depends on your rifle’s action and the bullet you are using. Lever-action rifles typically require an overall length of 2.550 inches or less to feed from the magazine. Single-shot rifles offer more flexibility. Always verify feeding and chamber fit with dummy rounds before loading live ammunition.

Is it safe to use 45-70 load data from older manuals?

Use caution with any load data more than 15-20 years old. Powder formulations change, bullet constructions evolve, and pressure measurement standards have been updated. Always use current published data from powder or bullet manufacturers and work up from the starting load.