300 Winchester Magnum Load Data & Ballistics Calculator
Estimate chamber pressure and muzzle velocity for the 300 Winchester Magnum 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 Winchester Magnum reference
Maximum average pressure (MAP)
64,000 psi
Nominal case capacity
89.0 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
64.7 gr
Barrel
24 in
Muzzle velocity
2,823 fps
Peak chamber pressure (interval, ±10% burn rate)
43,176 – 52,140 – 61,945 psi
nominal is 81% MAP (64,000 psi)
Illustrative example — every figure is an estimate; always confirm your load against a current published manual before loading.
Popular 300 Winchester Magnum powders
Powders and bullets handloaders commonly use for the 300 Winchester Magnum, 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 H1000
Alliant RL-22
Hodgdon Retumbo
Hodgdon H4831SC
Alliant RL-26
Alliant RL-25
IMR 4350
IMR 7828
Alliant RL-23
Hodgdon H4350
Vihtavuori N570
Hodgdon H414
Popular 300 Winchester Magnum bullets
Hornady 0.308 200 gr ELD-X
Berger 30 Cal 215 gr Hybrid Target
Nosler AccuBond 30 Cal 180 gr Spitzer
Nosler Ballistic Tip Hunting 30 Cal 180 gr Spitzer (Green Tip)
Barnes .308 180 gr TTSX BT
Nosler AccuBond 30 Cal 200 gr Spitzer
Berger 30 Cal 210 gr VLD Hunting
Nosler Partition 30 Cal 180 gr Spitzer
Sierra 30 Caliber (.308) 180 gr SBT GameKing
Hornady 0.308 195 gr BTHP Match
Barnes .308 200 gr LRX BT
Sierra 30 Caliber (.308) 200 gr HPBT MatchKing
Use MyLoads as a 300 Winchester Magnum 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.