Load Specifications
Load data in caliber .303 Savage with .308 | 170gr | Hornady InterLock FP bullet and 33 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Vihtavuori N135 and Accurate 2495.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 33,852 psi | 86% | 2054 fps | 97.5% |
| Accurate 2015 | <<locked>> | 88% | 33,605 psi | 86% | 2067 fps | 97.8% |
| Accurate 2495ᴾ | <<locked>> | 100% | 34,055 psi | 87% | 2136 fps | 98.1% |
| Accurate 2495 | <<locked>> | 98% | 33,895 psi | 87% | 2152 fps | 98.3% |
| Accurate 4064ᴾ | <<locked>> | 100% | 34,098 psi | 87% | 2165 fps | 95.8% |
| ADI AR 2219 | <<locked>> | 84% | 34,824 psi | 89% | 2090 fps | 95.9% |
| ADI AR 2219 | <<locked>> | 82% | 34,055 psi | 87% | 2096 fps | 96.1% |
| Alliant AR-Comp | <<locked>> | 94% | 35,404 psi | 90% | 2152 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 92% | 34,809 psi | 89% | 2162 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 34,577 psi | 88% | 2077 fps | 98.7% |
| Alliant Reloder-10x | <<locked>> | 84% | 34,432 psi | 88% | 2093 fps | 98.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 33,402 psi | 85% | 1985 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 35,114 psi | 90% | 2037 fps | 97% |
| Hodgdon H322 | <<locked>> | 86% | 35,375 psi | 90% | 2126 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,618 psi | 81% | 1345 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,894 psi | 81% | 1368 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 33,504 psi | 86% | 2119 fps | 96.3% |
| IMR 3031 | <<locked>> | 94% | 35,317 psi | 90% | 2178 fps | 97.4% |
| IMR 4198 | <<locked>> | 84% | 34,911 psi | 89% | 2034 fps | 99.3% |
| IMR 4198 | <<locked>> | 82% | 34,447 psi | 88% | 2044 fps | 99.4% |
| Norma 200 | <<locked>> | 82% | 34,896 psi | 89% | 2067 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,415 psi | 80% | 1378 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,705 psi | 81% | 1398 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 33,489 psi | 86% | 2037 fps | 96.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 34,998 psi | 89% | 2090 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 33,663 psi | 86% | 2034 fps | 95.8% |
| Somchem S335 | <<locked>> | 90% | 33,692 psi | 86% | 2044 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 86% | 33,620 psi | 86% | 2008 fps | 98.2% |
| Vihtavuori N130 | <<locked>> | 86% | 35,085 psi | 90% | 2057 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 92% | 34,693 psi | 89% | 2037 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 90% | 34,577 psi | 88% | 2057 fps | 97.8% |
| Vihtavuori N135 | <<locked>> | 98% | 34,185 psi | 87% | 2106 fps | 97.8% |
| Vihtavuori N135 | <<locked>> | 96% | 33,997 psi | 87% | 2126 fps | 98.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 28,079 psi | 72% | 1932 fps | 95.5% |
| Accurate 2015 | <<locked>> | 80% | 26,194 psi | 67% | 1906 fps | 95.1% |
| Accurate 2495 | 28.5 gr | 92% | 26,121 psi | 67% | 1972 fps | 95.3% |
| Accurate 2495 | 27.9 gr | 88% | 24,569 psi | 63% | 1946 fps | 95% |
| Accurate 4064 | <<locked>> | 98% | 31,763 psi | 81% | 2116 fps | 95% |
| ADI AR 2219 | <<locked>> | 82% | 32,474 psi | 83% | 2041 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 32,126 psi | 82% | 2057 fps | 95.3% |
| Alliant AR-Comp | 25.1 gr | 80% | 23,163 psi | 59% | 1857 fps | 95.5% |
| Alliant AR-Comp | 25.1 gr | 80% | 24,279 psi | 62% | 1913 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 28,863 psi | 74% | 1959 fps | 97.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 30,211 psi | 77% | 2005 fps | 97.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 31,589 psi | 81% | 1946 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 32,909 psi | 84% | 1995 fps | 96.3% |
| Hodgdon H322 | <<locked>> | 84% | 33,388 psi | 85% | 2083 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,206 psi | 59% | 1198 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,424 psi | 60% | 1217 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 31,604 psi | 81% | 2077 fps | 95.6% |
| IMR 3031 | <<locked>> | 88% | 29,370 psi | 75% | 2047 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 31,125 psi | 79% | 1959 fps | 98.5% |
| IMR 4198 | <<locked>> | 80% | 32,430 psi | 83% | 2005 fps | 99.1% |
| Norma 200 | <<locked>> | 80% | 32,460 psi | 83% | 2021 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,163 psi | 59% | 1230 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,380 psi | 60% | 1250 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 29,530 psi | 75% | 1952 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 31,053 psi | 79% | 2008 fps | 96.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 31,792 psi | 81% | 1998 fps | 95.1% |
| Somchem S335 | <<locked>> | 88% | 31,865 psi | 81% | 2008 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 27,934 psi | 71% | 1890 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 80% | 29,385 psi | 75% | 1942 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 86% | 29,225 psi | 75% | 1926 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 82% | 27,122 psi | 69% | 1896 fps | 95.1% |
| Vihtavuori N135 | 27 gr | 90% | 27,050 psi | 69% | 1952 fps | 95% |
| Vihtavuori N135 | 27 gr | 88% | 26,905 psi | 69% | 1969 fps | 95.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 33 powders for .303 Savage loaded with the .308 | 170gr | Hornady InterLock FP. IMR 3031 delivers the highest muzzle velocity at 2,178 fps; across all powders the maximum-charge window runs from 1,345 fps to 2,178 fps. Accurate 2495 gives the best case fill at 100 %, and 33 of the 33 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 80–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Hodgdon TrailBoss reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant AR-Comp, Vihtavuori N135, Accurate 2495 rank at the top here: for .303 Savage with the .308 | 170gr | Hornady InterLock FP they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.