Load Specifications
Load data in caliber .303 Savage with .308 | 90gr | Impala LWHV LS bullet and 6 powders. The key underlying parameters are shown in the table above.
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 |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 90% | 34,432 psi | 88% | 2844 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,501 psi | 75% | 1906 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 33,910 psi | 87% | 2733 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,993 psi | 74% | 1946 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 33,910 psi | 87% | 2635 fps | 100% |
| Vihtavuori N120 | <<locked>> | 90% | 34,679 psi | 89% | 2815 fps | 97.4% |
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 88% | 32,677 psi | 83% | 2795 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,930 psi | 56% | 1706 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 32,198 psi | 82% | 2687 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,669 psi | 55% | 1749 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 30,545 psi | 78% | 2556 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 29,501 psi | 75% | 2667 fps | 95.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 11 powders for .303 Savage loaded with the .308 | 90gr | Impala LWHV LS. ADI AR 2207 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,906 fps to 2,844 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 11 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 74–89 %, leaving at least 11 % 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. As outliers, Alliant Reloder-7, IMR 4198, IMR 4227 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.