Load Specifications
Load data in caliber 8 x 58 R with .318 | 196gr | Norma Soft Point ALASKA bullet and 6 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 27,238 psi | 85% | 1969 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 90% | 28,297 psi | 89% | 1280 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 27,833 psi | 87% | 1982 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 90% | 28,210 psi | 88% | 1309 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 27,905 psi | 87% | 1886 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 86% | 28,543 psi | 89% | 1975 fps | 98.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 22,234 psi | 70% | 1844 fps | 95.7% |
| Hodgdon TrailBoss | 9.8 gr | 80% | 24,221 psi | 76% | 1207 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 26,179 psi | 82% | 1939 fps | 95.8% |
| ReloadSwiss RS 14 | 10 gr | 80% | 24,221 psi | 76% | 1237 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 26,513 psi | 83% | 1854 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 23,888 psi | 75% | 1857 fps | 96.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 6 powders for 8 x 58 R loaded with the .318 | 196gr | Norma Soft Point ALASKA. IMR 3031 delivers the highest muzzle velocity at 1,982 fps; across all powders the maximum-charge window runs from 1,280 fps to 1,982 fps. Hodgdon TrailBoss gives the best case fill at 90 %, and 6 of the 6 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (220 MPa), the top charges use 85–89 %, leaving at least 11 % headroom. The 196.0 gr projectile in 0.318" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 8 x 58 R with the .318 | 196gr | Norma Soft Point ALASKA 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.