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 load. Always cross-check a current
published loading manual.
8mm Mauser (8x57) reference
Maximum average pressure (MAP)
35,000 psi
Nominal case capacity
63.0 gr H₂O
Groove / bullet diameter
0.323 in (8.20 mm)
Example simulation illustrative
Bullet
Hornady 0.323 170 gr InterLock RN
Powder
IMR 4895
Charge
40 gr
Barrel
24 in
Muzzle velocity
2,378 fps
Peak chamber pressure (interval, ±10% burn rate)
28,130 – 33,736 – 40,936 psi
nominal is 96% MAP (35,000 psi)
This sample load runs near MAP for the 8mm Mauser (8x57) (about 96% 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.
The simulator isn't optimized for this cartridge yet and may read pressure high and velocity high.
Illustrative example — every figure is an estimate; always confirm your load against a current published manual before loading.
Popular 8mm Mauser (8x57) powders
Powders and bullets handloaders commonly use for the 8mm Mauser (8x57), drawn from public discussion and listed most common first. They appear as the Popular group in the calculator's pickers. This is not a load recommendation — always check your load against a current published manual.
IMR 4064
Hodgdon Varget
Hodgdon H4895
IMR 3031
IMR 4350
Hodgdon H380
Vihtavuori N140
Alliant RL-7
Alliant RL-15
Winchester W748
Hodgdon H4831
Winchester W760
Popular 8mm Mauser (8x57) bullets
Hornady 0.323 170 gr InterLock RN
Sierra 8mm .323 Caliber (.323) 175 gr Spitzer Pro-Hunter
Hornady 0.323 195 gr InterLock SP
Nosler Partition 8mm 200 gr Spitzer
Speer Hot-Cor Semi-Spitzer SP .323 170 gr
Hornady 0.323 150 gr InterLock SP
Sierra 8mm .323 Caliber (.323) 150 gr Spitzer Pro-Hunter
Speer Hot-Cor Spitzer SP .323 200 gr
Nosler Ballistic Tip Hunting 8mm 180 gr Spitzer (Gunmetal Tip)
Hornady 0.323 196 gr BTHP Match
Use MyLoads as a 8mm Mauser (8x57) velocity and pressure calculator: it estimates
muzzle velocity, muzzle energy and the full chamber-pressure curve for your own powder,
charge and barrel length, compared against the reference facts above.