Estimate chamber pressure and muzzle velocity for the 300 WSM 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.
300 WSM reference
Maximum average pressure (MAP)
65,000 psi
Nominal case capacity
80.0 gr H₂O
Groove / bullet diameter
0.308 in (7.82 mm)
Example simulation illustrative
Bullet
Nosler E-Tip 30 Cal 180 gr Spitzer
Powder
IMR 4350
Charge
62 gr
Barrel
24 in
Muzzle velocity
2,807 fps
Peak chamber pressure (interval, ±10% burn rate)
42,625 – 51,971 – 62,272 psi
nominal is 80% MAP (65,000 psi)
Illustrative example — every figure is an estimate; always confirm your load against a current published manual before loading.
Popular 300 WSM powders
Powders and bullets handloaders commonly use for the 300 WSM, 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.
Hodgdon H4350
Hodgdon H4831SC
Alliant RL-17
Alliant RL-23
IMR 4831
Alliant RL-22
Hodgdon Retumbo
IMR 7828 SSC
Hodgdon Varget
Alliant RL-19
IMR 4350
Vihtavuori N560
Popular 300 WSM bullets
Nosler AccuBond 30 Cal 180 gr Spitzer
Nosler AccuBond 30 Cal 165 gr Spitzer
Nosler AccuBond 30 Cal 150 gr Spitzer
Nosler Ballistic Tip Hunting 30 Cal 180 gr Spitzer (Green Tip)
Nosler Ballistic Tip Hunting 30 Cal 165 gr Spitzer (Green Tip)
Nosler Ballistic Tip Hunting 30 Cal 150 gr Spitzer (Green Tip)
Nosler Partition 30 Cal 180 gr Spitzer
Nosler Partition 30 Cal 165 gr Spitzer
Barnes .308 180 gr TTSX BT
Barnes .308 168 gr TTSX BT
Hornady 0.308 178 gr ELD Match
Hornady 0.308 200 gr ELD-X
Berger 30 Cal 215 gr Hybrid Target
Berger 30 Cal 230 gr Hybrid OTM Tactical
Use MyLoads as a 300 WSM 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.