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6mm GT Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 6mm GT 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.

6mm GT reference

Maximum average pressure (MAP)62,000 psi
Nominal case capacity42.0 gr H₂O
Groove / bullet diameter0.243 in (6.17 mm)

Example simulation illustrative

Bullet
Hornady 0.243 108 gr ELD Match
Powder
Hodgdon Superformance
Charge
37 gr
Barrel
24 in

Muzzle velocity

2,958 fps

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

40,330 – 60,018 – 86,296 psi

nominal is 97% of the 62,000 psi maximum average pressure

This sample load runs near the maximum average pressure for the 6mm GT (about 97% 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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