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6.8 Western Load Data & Ballistics Calculator

Estimate chamber pressure and muzzle velocity for the 6.8 Western 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.

6.8 Western reference

Maximum average pressure (MAP)65,000 psi
Nominal case capacity77.0 gr H₂O
Groove / bullet diameter0.277 in (7.04 mm)

Example simulation illustrative

Bullet
Barnes .277 129 gr LRX BT
Powder
Hodgdon Superformance
Charge
56.4 gr
Barrel
24 in

Muzzle velocity

3,064 fps

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

38,075 – 51,280 – 67,028 psi

nominal is 79% of the 65,000 psi maximum average pressure

This sample load runs near the maximum average pressure for the 6.8 Western (about 79% 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 6.8 Western in the MyLoads calculator →

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