300 Remington Ultra Magnum Load Data & Ballistics Calculator
Estimate chamber pressure and muzzle velocity for the 300 Remington Ultra 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 Remington Ultra Magnum reference
Maximum average pressure (MAP)
65,000 psi
Nominal case capacity
110.0 gr H₂O
Groove / bullet diameter
0.308 in (7.82 mm)
Example simulation illustrative
Bullet
Hornady 0.308 200 gr ELD-X
Powder
Hodgdon Retumbo
Charge
87.2 gr
Barrel
26 in
Muzzle velocity
2,871 fps
Peak chamber pressure (interval, ±10% burn rate)
43,108 – 52,592 – 63,030 psi
nominal is 81% MAP (65,000 psi)
Illustrative example — every figure is an estimate; always confirm your load against a current published manual before loading.
Popular 300 Remington Ultra Magnum powders
Powders and bullets handloaders commonly use for the 300 Remington Ultra 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 Retumbo
Alliant RL-25
Hodgdon H1000
IMR 7828
Hodgdon H4831SC
Alliant RL-33
Alliant RL-22
IMR 4831
Vihtavuori N570
Alliant RL-26
Hodgdon US 869
IMR 7977
Popular 300 Remington Ultra Magnum bullets
Nosler AccuBond 30 Cal 200 gr Spitzer
Nosler AccuBond 30 Cal 180 gr Spitzer
Nosler AccuBond Long Range 30 Cal 210 gr Spitzer
Nosler Partition 30 Cal 200 gr Spitzer
Berger 30 Cal 210 gr VLD Hunting
Berger 30 Cal 190 gr VLD Hunting
Hornady 0.308 200 gr ELD-X
Barnes .308 180 gr TTSX BT
Nosler Ballistic Tip Hunting 30 Cal 180 gr Spitzer (Green Tip)
Hornady 0.308 180 gr SST
Hornady 0.308 208 gr A-MAX
Sierra 30 Caliber (.308) 220 gr HPBT MatchKing
Nosler AccuBond 30 Cal 165 gr Spitzer
Use MyLoads as a 300 Remington Ultra 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.