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444 Marlin Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 444 Marlin 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.

444 Marlin reference

Maximum average pressure (MAP)42,000 psi
Nominal case capacity70.0 gr H₂O
Groove / bullet diameter0.430 in (10.92 mm)

Example simulation illustrative

Bullet
Hornady 0.430 265 gr InterLock FP
Powder
Vihtavuori N-130
Charge
47.7 gr
Barrel
22 in

Muzzle velocity

2,094 fps

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

34,358 – 40,139 – 46,006 psi

nominal is 96% of the 42,000 psi maximum average pressure

This sample load runs near the maximum average pressure for the 444 Marlin (about 96% 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.

Open the 444 Marlin in the MyLoads calculator →

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