Load Specifications
Load data in caliber 9.3 x 57 with .366 | 286gr | North Fork Semi Spitz bullet and 45 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 IMR 3031.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 38,363 psi | 88% | 1991 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 38,885 psi | 89% | 2024 fps | 98.8% |
| Accurate 2495 | <<locked>> | 94% | 38,305 psi | 88% | 2057 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 37,043 psi | 85% | 2044 fps | 98.1% |
| Accurate 4064 | <<locked>> | 96% | 38,189 psi | 88% | 2073 fps | 99.2% |
| ADI Benchmark 8208 | <<locked>> | 86% | 37,362 psi | 86% | 1998 fps | 96.3% |
| Alliant AR-Comp | <<locked>> | 88% | 37,420 psi | 86% | 2044 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 37,391 psi | 86% | 2060 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 38,624 psi | 89% | 2070 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 82% | 38,899 psi | 89% | 2001 fps | 100% |
| Bofors RP3 | <<locked>> | 96% | 37,637 psi | 87% | 2070 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 37,782 psi | 87% | 1962 fps | 97% |
| Hodgdon BL-C2 | <<locked>> | 90% | 39,291 psi | 90% | 2087 fps | 97.6% |
| Hodgdon H322 | <<locked>> | 84% | 36,811 psi | 85% | 2001 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 38,000 psi | 87% | 2077 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,141 psi | 76% | 1276 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 39,175 psi | 90% | 2093 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 37,362 psi | 86% | 1998 fps | 96.3% |
| Lovex D073.5 | <<locked>> | 84% | 38,682 psi | 89% | 2024 fps | 97.7% |
| Lovex D073.6 | <<locked>> | 90% | 37,043 psi | 85% | 2044 fps | 98.1% |
| Lovex S062 | <<locked>> | 94% | 39,189 psi | 90% | 2047 fps | 97% |
| Norma 201 | <<locked>> | 90% | 38,972 psi | 90% | 2028 fps | 96.9% |
| Norma 202 | <<locked>> | 90% | 38,653 psi | 89% | 2041 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,170 psi | 76% | 1306 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 37,173 psi | 85% | 1991 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 36,941 psi | 85% | 2090 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 86% | 38,087 psi | 88% | 1995 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 92% | 39,204 psi | 90% | 2024 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 98% | 37,289 psi | 86% | 2054 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 37,043 psi | 85% | 2044 fps | 98.1% |
| Shooters World Precision | <<locked>> | 94% | 39,189 psi | 90% | 2047 fps | 97% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 39,117 psi | 90% | 1969 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 37,840 psi | 87% | 1969 fps | 99.3% |
| Somchem S321 | <<locked>> | 84% | 37,202 psi | 86% | 2018 fps | 96.7% |
| Somchem S335 | <<locked>> | 88% | 38,189 psi | 88% | 1975 fps | 99.3% |
| Somchem S355 | <<locked>> | 98% | 38,928 psi | 89% | 2064 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 37,188 psi | 85% | 1936 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 38,769 psi | 89% | 1975 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 92% | 37,130 psi | 85% | 2021 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 39,015 psi | 90% | 2031 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 98% | 37,434 psi | 86% | 2018 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 86% | 37,318 psi | 86% | 1995 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 92% | 37,449 psi | 86% | 2024 fps | 98.5% |
| Winchester 748 | <<locked>> | 86% | 38,609 psi | 89% | 2073 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 84% | 38,348 psi | 88% | 2054 fps | 95.8% |
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 2015 | <<locked>> | 80% | 31,836 psi | 73% | 1880 fps | 99.4% |
| Accurate 2460 | <<locked>> | 80% | 33,924 psi | 78% | 1942 fps | 97.7% |
| Accurate 2495 | <<locked>> | 80% | 24,279 psi | 56% | 1791 fps | 97.8% |
| Accurate 2520 | <<locked>> | 80% | 28,253 psi | 65% | 1877 fps | 95.3% |
| Accurate 4064 | 37.4 gr | 82% | 24,569 psi | 56% | 1804 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 35,172 psi | 81% | 1959 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 29,124 psi | 67% | 1896 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 34,882 psi | 80% | 2014 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 36,085 psi | 83% | 2024 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,535 psi | 84% | 1965 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 35,085 psi | 81% | 2024 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 33,576 psi | 77% | 1886 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 84% | 32,358 psi | 74% | 1962 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 32,489 psi | 75% | 1926 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 35,868 psi | 82% | 2037 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,613 psi | 57% | 1138 fps | 100% |
| IMR 3031 | 34.9 gr | 80% | 25,744 psi | 59% | 1827 fps | 97% |
| IMR 8208 XBR | <<locked>> | 84% | 35,172 psi | 81% | 1959 fps | 95.6% |
| Lovex D073.5 | <<locked>> | 80% | 33,591 psi | 77% | 1936 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 28,253 psi | 65% | 1877 fps | 95.3% |
| Lovex S062 | <<locked>> | 90% | 34,737 psi | 80% | 1972 fps | 95.7% |
| Norma 201 | <<locked>> | 86% | 34,577 psi | 79% | 1949 fps | 95.6% |
| Norma 202 | <<locked>> | 80% | 28,268 psi | 65% | 1847 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,511 psi | 56% | 1165 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 34,983 psi | 80% | 1955 fps | 97.1% |
| ReloadSwiss RS 60 | 45 gr | 92% | 32,518 psi | 75% | 1995 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 32,068 psi | 74% | 1886 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 88% | 34,809 psi | 80% | 1949 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 96% | 35,027 psi | 81% | 2014 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 28,253 psi | 65% | 1877 fps | 95.3% |
| Shooters World Precision | <<locked>> | 90% | 34,737 psi | 80% | 1972 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 30,690 psi | 71% | 1821 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 24,845 psi | 57% | 1716 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 32,605 psi | 75% | 1936 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 29,950 psi | 69% | 1827 fps | 97.5% |
| Somchem S355 | <<locked>> | 96% | 36,637 psi | 84% | 2028 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 34,940 psi | 80% | 1900 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 80% | 30,429 psi | 70% | 1834 fps | 99% |
| Vihtavuori N135 | <<locked>> | 80% | 25,570 psi | 59% | 1801 fps | 98% |
| Vihtavuori N140 | <<locked>> | 80% | 26,847 psi | 62% | 1798 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 94% | 33,156 psi | 76% | 1942 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 84% | 34,838 psi | 80% | 1952 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 82% | 27,354 psi | 63% | 1827 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 31,691 psi | 73% | 1942 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 35,882 psi | 82% | 2011 fps | 95% |
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 75 powders for 9.3 x 57 loaded with the .366 | 286gr | North Fork Semi Spitz. Alliant Reloder-17 delivers the highest muzzle velocity at 2,116 fps; across all powders the maximum-charge window runs from 1,276 fps to 2,116 fps. Alliant Reloder-17 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 286.0 gr projectile in 0.366" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-17, Hodgdon Hybrid 100V, 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. ReloadSwiss RS 60, Accurate 4064, IMR 3031 rank at the top here: for 9.3 x 57 with the .366 | 286gr | North Fork Semi Spitz they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2206H, ADI AR 2208, Alliant Power Pro 2000-MR 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.