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460 Weatherby Magnum Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 460 Weatherby Magnum with the free, in-browser MyLoads internal-ballistics simulator. The figures below are illustrative estimates from a physics model — not a recommended recipe. Always cross-check a current published loading manual.

460 Weatherby Magnum reference

Maximum average pressure (MAP)4,400 BAR
Nominal case capacity141.0 gr H₂O
Groove / bullet diameter0.458 in (11.63 mm)

Example simulation illustrative

Bullet
Hornady 0.458 350 gr InterLock FP
Powder
IMR 4064
Charge
104.2 gr
Barrel
26 in

Muzzle velocity

2,895 fps

Peak chamber pressure (interval, ±10% burn-rate)

46,779 – 59,356 – 74,082 psi

nominal is 93% of the 63,817 psi maximum average pressure

This sample load runs near the maximum average pressure for the 460 Weatherby Magnum (about 93% of MAP at the nominal estimate; the upper interval can exceed it). It is shown only to illustrate the simulator — reduce the charge and work up from your manual's start load.

Illustrative example — every figure here is an estimate and can be wrong. Always consult a current published loading manual, and never trust these numbers on their own.

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