Load Specifications
Load data in caliber .303 Savage with .310 | 123gr | Barnes TAC-X bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 and ReloadSwiss RS 14.
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>> | 88% | 34,418 psi | 88% | 2461 fps | 98.9% |
| Alliant Reloder-7 | <<locked>> | 86% | 34,287 psi | 88% | 2405 fps | 95.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,240 psi | 75% | 1598 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 35,346 psi | 90% | 2431 fps | 96.5% |
| Lovex S053 | <<locked>> | 82% | 35,346 psi | 90% | 2382 fps | 99.9% |
| Norma 200 | <<locked>> | 90% | 33,649 psi | 86% | 2451 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,601 psi | 73% | 1634 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 35,056 psi | 90% | 2415 fps | 97.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 35,244 psi | 90% | 2267 fps | 100% |
| Vihtavuori N120 | <<locked>> | 88% | 34,722 psi | 89% | 2434 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | 24.7 gr | 80% | 26,585 psi | 68% | 2267 fps | 96.6% |
| Alliant Reloder-7 | <<locked>> | 84% | 31,952 psi | 82% | 2352 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,321 psi | 54% | 1427 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 31,792 psi | 81% | 2346 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 33,257 psi | 85% | 2339 fps | 99.7% |
| Norma 200 | <<locked>> | 88% | 31,415 psi | 80% | 2398 fps | 95.3% |
| ReloadSwiss RS 14 | 9.1 gr | 80% | 20,972 psi | 54% | 1460 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 32,982 psi | 84% | 2372 fps | 97.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 31,502 psi | 80% | 2195 fps | 100% |
| Vihtavuori N120 | 24.7 gr | 80% | 26,977 psi | 69% | 2251 fps | 97.9% |
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 10 powders for .303 Savage loaded with the .310 | 123gr | Barnes TAC-X. ADI AR 2207 delivers the highest muzzle velocity at 2,461 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,461 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 10 of the 10 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 123.0 gr projectile in 0.31" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. 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. ADI AR 2207, Vihtavuori N120, ReloadSwiss RS 14 rank at the top here: for .303 Savage with the .310 | 123gr | Barnes TAC-X 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.