Load Specifications
Load data in caliber .303 Savage with .308 | 220gr | A-Square MONO RN bullet and 27 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Accurate 4064 and Vihtavuori N150.
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 2495 | <<locked>> | 88% | 35,201 psi | 90% | 1903 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 34,911 psi | 89% | 1896 fps | 98.2% |
| Accurate 4064 | <<locked>> | 90% | 35,128 psi | 90% | 1923 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 82% | 33,997 psi | 87% | 1886 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 35,143 psi | 90% | 1913 fps | 96.2% |
| Bofors RP3 | <<locked>> | 90% | 34,142 psi | 87% | 1909 fps | 96% |
| Hodgdon BL-C2 | <<locked>> | 84% | 35,375 psi | 90% | 1923 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,576 psi | 86% | 1224 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 34,505 psi | 88% | 1916 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 84% | 33,388 psi | 85% | 1883 fps | 97.8% |
| Lovex S062 | <<locked>> | 86% | 33,649 psi | 86% | 1857 fps | 96.1% |
| Norma 201 | <<locked>> | 82% | 33,228 psi | 85% | 1831 fps | 96% |
| Norma 202 | <<locked>> | 84% | 35,056 psi | 90% | 1883 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,040 psi | 87% | 1257 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 35,418 psi | 90% | 1972 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 33,692 psi | 86% | 1834 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,388 psi | 85% | 1883 fps | 97.8% |
| Shooters World Precision | <<locked>> | 86% | 33,649 psi | 86% | 1857 fps | 96.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 35,273 psi | 90% | 1814 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 34,214 psi | 87% | 1818 fps | 99.2% |
| Somchem S335 | <<locked>> | 82% | 34,505 psi | 88% | 1821 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 82% | 35,114 psi | 90% | 1821 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 86% | 34,011 psi | 87% | 1870 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 86% | 35,157 psi | 90% | 1870 fps | 99% |
| Vihtavuori N150 | <<locked>> | 92% | 33,953 psi | 87% | 1867 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 86% | 33,924 psi | 87% | 1867 fps | 98.3% |
| Winchester 748 | <<locked>> | 82% | 34,200 psi | 87% | 1900 fps | 97.2% |
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 2495 | <<locked>> | 80% | 27,021 psi | 69% | 1755 fps | 99.1% |
| Accurate 2520 | <<locked>> | 80% | 32,648 psi | 83% | 1857 fps | 97.6% |
| Accurate 4064 | 26.3 gr | 80% | 25,628 psi | 65% | 1736 fps | 96.4% |
| Alliant AR-Comp | <<locked>> | 80% | 31,720 psi | 81% | 1847 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 32,924 psi | 84% | 1873 fps | 95.4% |
| Bofors RP3 | <<locked>> | 88% | 31,937 psi | 82% | 1870 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 31,067 psi | 79% | 1844 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,092 psi | 64% | 1093 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 30,371 psi | 78% | 1837 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 29,196 psi | 75% | 1801 fps | 96.5% |
| Lovex S062 | <<locked>> | 84% | 31,546 psi | 81% | 1818 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 31,096 psi | 79% | 1791 fps | 95.2% |
| Norma 202 | <<locked>> | 80% | 30,995 psi | 79% | 1811 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,918 psi | 64% | 1115 fps | 100% |
| ReloadSwiss RS 60 | 31.1 gr | 88% | 31,270 psi | 80% | 1883 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 82% | 31,560 psi | 81% | 1795 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 29,196 psi | 75% | 1801 fps | 96.5% |
| Shooters World Precision | <<locked>> | 84% | 31,546 psi | 81% | 1818 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,301 psi | 85% | 1781 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,948 psi | 69% | 1683 fps | 97.3% |
| Somchem S335 | <<locked>> | 80% | 32,387 psi | 83% | 1785 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 80% | 33,141 psi | 85% | 1788 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 80% | 28,152 psi | 72% | 1765 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 80% | 29,167 psi | 74% | 1762 fps | 97.5% |
| Vihtavuori N150 | 29.3 gr | 88% | 30,052 psi | 77% | 1795 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 27,963 psi | 71% | 1752 fps | 96.5% |
| Winchester 748 | <<locked>> | 80% | 32,039 psi | 82% | 1857 fps | 96.5% |
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 27 powders for .303 Savage loaded with the .308 | 220gr | A-Square MONO RN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 1,972 fps; across all powders the maximum-charge window runs from 1,224 fps to 1,972 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 27 of the 27 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14 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. ReloadSwiss RS 60, Accurate 4064, Vihtavuori N150 rank at the top here: for .303 Savage with the .308 | 220gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.