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8mm Mauser (8x57) Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 8mm Mauser (8x57) 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.

8mm Mauser (8x57) reference

Maximum average pressure (MAP)35,000 psi
Nominal case capacity63.0 gr H₂O
Groove / bullet diameter0.323 in (8.20 mm)

Example simulation illustrative

Bullet
Hornady 0.323 170 gr InterLock RN
Powder
IMR 4320
Charge
39 gr
Barrel
24 in

Muzzle velocity

2,241 fps

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

26,600 – 31,964 – 38,774 psi

nominal is 91% of the 35,000 psi maximum average pressure

This sample load runs near the maximum average pressure for the 8mm Mauser (8x57) (about 91% 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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