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Remington Core-Lokt 45-70 Gov’t 405 Grain SP

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Ammo Reports Team 15 45-70 Government

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Data is based on official manufacturer sources. Found an error? Send us the source link.

Remington Core-Lokt 45-70 Gov't 405 Grain SP (Box)

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Ballistics Table – 100-Yard Zero

Calculated reference – not manufacturer data. G1 point-mass reference using BC 0.281, 1,330 fps muzzle velocity, 405 gr bullet, 100-yard zero and 1.5-inch sight height. Atmosphere: sea level, 59 F, 29.92 inHg, dry air, no wind. The 25-yard rows use shape-preserving interpolation between calculated 50-yard outputs.

Key takeaway: This table is a trajectory reference under the stated conditions, not a terminal-performance test or a recommended maximum hunting range.

The Core-Lokt Bullet Design

The Remington Core-Lokt is one of the longest-running controlled-expansion bullet designs in commercial ammunition history, having been introduced in 1939. Its defining feature is a mechanical interlock between the lead core and the copper jacket: the jacket is tapered and crimped inward at the bullet’s shank, physically locking the two components together rather than relying solely on bonding chemistry. This construction is specifically intended to prevent the jacket from separating from the core during expansion — a failure mode that reduces penetration and terminal energy transfer.

Remington describes a tapered copper jacket mechanically locked to a lead core. A guaranteed 95% weight-retention figure was not verified for this exact load.

Remington identifies 29473 / R4570G as Reduced Pressure, with a published muzzle velocity of 1,330 fps. It is distinct from 21459 / R4570G1 at 1,600 fps. Cartridge designation alone does not establish firearm compatibility. Follow the ammunition and firearm manufacturers’ instructions for the exact load and firearm; a low advertised velocity is not proof of a low pressure rating.

Best Uses

Good fit:

• Deer hunting inside 150 yards in dense cover where a lever-action’s compact profile is advantageous
• Black bear and hog hunting where heavy, deep-penetrating bullets are preferred over rapid fragmentation
• Elk and large ungulates at close to moderate range with shot placement emphasis
• Hunting in jurisdictions with no restrictions on lead projectiles
• Shooters running traditional lever-action rifles (Marlin 1895, Henry, Winchester 1886) who want a historically appropriate load
• Hunters who prioritize proven, widely available factory ammunition over specialty boutique loads

Not the right tool for:

• Shots beyond 150–175 yards — the trajectory drop becomes difficult to compensate for without a rangefinder and practiced holdover
• Varmint or predator hunting where meat damage is a concern — a 405-grain expanding bullet is excessive for small-bodied targets
• States or public lands where lead-free ammunition is mandated (California condor zones, certain national parks)
• Hunters expecting flat-shooting performance comparable to modern spitzer-loaded cartridges
• Lever-action rifles with magazine tube concerns around pointed bullets — this is a flat-point soft point and is safe for tubular magazines, but the blunt profile accelerates velocity loss downrange

Reliability Notes

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Manufacturer descriptions establish construction and intended use, not independently measured reliability. No structured results for this exact product are recorded on this page. Remington identifies 29473 / R4570G as Reduced Pressure, with a published muzzle velocity of 1,330 fps. It is distinct from 21459 / R4570G1 at 1,600 fps. Cartridge designation alone does not establish firearm compatibility. Follow the ammunition and firearm manufacturers’ instructions for the exact load and firearm; a low advertised velocity is not proof of a low pressure rating.

• Remington describes a mechanically locked lead core and jacket; 95% retention was not verified for this exact load.
• The tapered copper jacket is described as controlling expansion rate to produce consistent mushrooming across a range of impact velocities, which is relevant for a cartridge like the 45-70 whose velocity varies significantly depending on range.
• Compatibility must be confirmed for the exact Remington item and firearm; the 405 gr weight and 45-70 chambering do not establish approval for every lever-action rifle.
• Open-source field reports (hunting forums, outdoor publications) frequently describe reliable feeding in Marlin 1895 and Henry lever-action platforms, though these are anecdotal and not part of structured data collection.

Competitors

The 325 gr FTX has a higher muzzle velocity, but its G1 BC of 0.230 is lower than the Remington 405 gr SP value of 0.281. Compare complete factory tables under their stated conditions.

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