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27 Nosler Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 27 Nosler 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.

27 Nosler reference

Maximum average pressure (MAP)65,000 psi
Nominal case capacity92.0 gr H₂O
Groove / bullet diameter0.277 in (7.04 mm)

Example simulation illustrative

Bullet
Hornady 0.277 150 gr InterBond
Powder
Hodgdon Retumbo
Charge
75.5 gr
Barrel
24 in

Muzzle velocity

2,940 fps

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

44,062 – 55,060 – 67,649 psi

nominal is 85% of the 65,000 psi maximum average pressure

This sample load runs near the maximum average pressure for the 27 Nosler (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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