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Winchester Super-X .45-70 300 Grain JHP

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Ammo Reports Team 8 45-70 Government

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

Winchester Super-X .45-70 300 Grain JHP (Box)

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Ballistics Table – 100-Yard Zero

Calculated interpolation reference – not manufacturer 25-yard data. Values use shape-preserving interpolation between Winchester’s 2026 catalog points for the 1,920 fps / G1 0.184 dataset and a 100-yard zero. A 1.5-inch sight height is assumed only for the muzzle path. No wind column is shown.

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

The JHP in a Lever-Action Context

The jacketed hollow point design in a .45-70 Government load occupies a specific role. Unlike flat-nosed or soft-point bullets historically favored in tubular magazines, a JHP in this caliber is typically loaded with a controlled-expansion profile that initiates reliably at the moderate impact velocities common to lever-action rifles. The large frontal diameter of a .458-inch projectile already creates a substantial wound channel even before expansion, so the hollow point’s primary benefit here is consistent, rapid mushrooming at woods-range velocities rather than dramatic diameter increase.

Winchester’s Super-X line, which dates to 1921 and originated as a shotshell brand before expanding to centerfire rifle ammunition, has long emphasized dependable terminal performance over cutting-edge ballistic design. This load reflects that philosophy: it is not engineered around polymer tips or bonded cores, but rather around a straightforward copper-jacketed lead-core bullet that performs predictably across the velocity range a lever-action .45-70 produces. Shooters using this load in single-shot or bolt-action rifles capable of higher-pressure loads should verify that this specific load is appropriate for their firearm’s pressure rating.

Best Uses

Good fit:

• Deer hunting in heavy brush or timber where shots are under 150 yards
• Wild hog hunting at close to moderate range
• Black bear hunting in states where JHP is legal for big game
• Lever-action rifle practice at ranges where trajectory management is part of the training goal
• Hunters who prefer newly manufactured brass for consistent chamber fit and reliable feeding

Not the right tool for:

• Long-range hunting scenarios beyond 200 yards, where trajectory drop becomes difficult to manage reliably
• Elk or moose hunting, where deeper penetration from a bonded or hard-cast bullet is generally preferred
• Firearms without confirmed approval for this exact ammunition
• Jurisdictions or hunting zones that prohibit lead-core projectiles — this is a lead-core JHP, not a lead-free alternative
• Competitors or handloaders seeking a premium, high-BC projectile for precision work

Reliability Notes

No structured submissions yet.

Winchester publishes conflicting figures for X4570H: its web listing gives 1,880 fps, 2,355 ft-lbs and G1 BC 0.283; the 2026 catalog gives 1,920 fps, 2,455 ft-lbs and G1 BC 0.184. The table below keeps the catalog dataset together rather than mixing the two versions. No structured, load-specific reliability test is presented here. Component details or general reputation should not be treated as proof of feeding, accuracy or absence of defects.

Competitors

Winchester publishes conflicting figures for X4570H: its web listing gives 1,880 fps, 2,355 ft-lbs and G1 BC 0.283; the 2026 catalog gives 1,920 fps, 2,455 ft-lbs and G1 BC 0.184. The table below keeps the catalog dataset together rather than mixing the two versions. Comparisons with a 325 gr FTX load must identify that exact Hornady item; it is not the 250 gr MonoFlex page.

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