Estimate chamber pressure and muzzle velocity for the 270 Winchester 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.
270 Winchester reference
Maximum average pressure (MAP)
65,000 psi
Nominal case capacity
67.0 gr H₂O
Groove / bullet diameter
0.277 in (7.04 mm)
Example simulation illustrative
Bullet
Hornady 0.277 130 gr InterLock SP
Powder
IMR 4350
Charge
50.2 gr
Barrel
24 in
Muzzle velocity
2,897 fps
Peak chamber pressure (interval, ±10% burn rate)
42,193 – 52,293 – 63,547 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 270 Winchester powders
Powders and bullets handloaders commonly use for the 270 Winchester, 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 H4831SC
Hodgdon H4350
IMR 4350
IMR 7828 SSC
Alliant RL-22
Hodgdon Varget
Hodgdon H1000
Alliant RL-19
IMR 4064
Hodgdon Retumbo
Alliant RL-26
Alliant Reloder 16
Popular 270 Winchester bullets
Nosler AccuBond 270 Cal 140 gr Spitzer
Hornady 0.277 130 gr SST
Nosler Ballistic Tip Hunting 270 Cal 130 gr Spitzer (Yellow Tip)
Nosler Partition 270 Cal 150 gr Spitzer
Barnes .277 130 gr TTSX BT
Sierra 270 Caliber 6.8 SPC (.277) 130 gr SBT GameKing
Sierra 270 Caliber 6.8 SPC (.277) 140 gr HPBT GameKing
Hornady 0.277 145 gr ELD-X
Nosler Partition 270 Cal 140 gr Spitzer
Sierra 270 Caliber 6.8 SPC (.277) 150 gr SBT GameKing
Hornady 0.277 150 gr InterBond
Barnes .277 129 gr LRX BT
Hornady 0.277 110 gr V-MAX W/C
Use MyLoads as a 270 Winchester 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.