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50 Action Express Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 50 Action Express 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.

50 Action Express reference

Maximum average pressure (MAP)35,000 psi
Nominal case capacity47.0 gr H₂O
Groove / bullet diameter0.501 in (12.73 mm)

Example simulation illustrative

Bullet
Hornady 0.500 300 gr XTP Mag
Powder
Hodgdon H110
Charge
27.7 gr
Barrel
4 in

Muzzle velocity

1,180 fps

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

20,976 – 29,862 – 40,738 psi

nominal is 85% of the 35,000 psi maximum average pressure

This sample load runs near the maximum average pressure for the 50 Action Express (about 85% 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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