300 Ruger Compact Magnum Load Data & Ballistics Calculator
Estimate chamber pressure and muzzle velocity for the 300 Ruger Compact 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 Ruger Compact Magnum reference
Maximum average pressure (MAP)
65,000 psi
Nominal case capacity
74.0 gr H₂O
Groove / bullet diameter
0.308 in (7.82 mm)
Example simulation illustrative
Bullet
Hornady 0.308 165 gr GMX
Powder
Hodgdon Superformance
Charge
57.1 gr
Barrel
20 in
Muzzle velocity
2,583 fps
Peak chamber pressure (interval, ±10% burn rate)
30,300 – 39,292 – 49,441 psi
nominal is 60% MAP (65,000 psi)
Illustrative example — every figure is an estimate; always confirm your load against a current published manual before loading.
Popular 300 Ruger Compact Magnum powders
Powders and bullets handloaders commonly use for the 300 Ruger Compact 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 H4350
Hodgdon Varget
Hodgdon H414
Alliant RL-15
Hodgdon Superformance
Ramshot Big Game
Ramshot Hunter
Winchester W760
Accurate A-2700
IMR 4350
IMR 4451
Alliant RL-17
Popular 300 Ruger Compact Magnum bullets
Hornady 0.308 178 gr ELD Match
Hornady 0.308 165 gr GMX
Barnes .308 180 gr TSX BT
Hornady 0.308 150 gr SST
Barnes .308 150 gr TSX BT
Barnes .308 165 gr TSX BT
Nosler Ballistic Tip Hunting 30 Cal 168 gr Spitzer (Green Tip)
Nosler Partition 30 Cal 200 gr Spitzer
Hornady 0.308 178 gr A-MAX
Sierra 30 Caliber (.308) 168 gr HPBT MatchKing
Speer Grand Slam GSSP .308 165 gr
Sierra 30 Caliber (.308) 135 gr HP Varminter
Nosler Custom Competition 30 Cal 155 gr HPBT
Speer Boat-Tail BTSP .308 150 gr
Speer Varmint HP .308 130 gr
Use MyLoads as a 300 Ruger Compact 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.