Load Specifications
Load data in caliber 9.3 x 57 with .366 | 250gr | Fox Classic Hunter bullet and 37 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp and Norma 202.
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 2015 | <<locked>> | 92% | 37,710 psi | 87% | 2123 fps | 99.3% |
| Accurate 2460 | <<locked>> | 90% | 38,261 psi | 88% | 2152 fps | 97% |
| Accurate 2495ᴾ | <<locked>> | 100% | 36,027 psi | 83% | 2172 fps | 99.3% |
| Accurate 2520 | <<locked>> | 94% | 38,058 psi | 87% | 2185 fps | 96.5% |
| Accurate 4064ᴾ | <<locked>> | 100% | 33,649 psi | 77% | 2139 fps | 96.7% |
| Accurate LT-30 | <<locked>> | 82% | 36,970 psi | 85% | 2024 fps | 97.9% |
| Accurate LT-32 | <<locked>> | 82% | 37,376 psi | 86% | 2028 fps | 96% |
| ADI AR 2207 | <<locked>> | 82% | 38,624 psi | 89% | 2103 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 38,928 psi | 89% | 2172 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 94% | 37,072 psi | 85% | 2182 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 38,798 psi | 89% | 2146 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 37,391 psi | 86% | 2057 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 88% | 37,869 psi | 87% | 2152 fps | 98% |
| Hodgdon H335 | <<locked>> | 88% | 38,072 psi | 88% | 2162 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,879 psi | 73% | 1345 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 37,434 psi | 86% | 2201 fps | 98.7% |
| IMR 4198 | <<locked>> | 86% | 38,653 psi | 89% | 2096 fps | 100% |
| Lovex D073.4 | <<locked>> | 84% | 38,972 psi | 90% | 2162 fps | 96.5% |
| Lovex D073.6 | <<locked>> | 98% | 38,363 psi | 88% | 2201 fps | 96.6% |
| Norma 200 | <<locked>> | 84% | 38,537 psi | 89% | 2129 fps | 100% |
| Norma 202 | <<locked>> | 96% | 38,203 psi | 88% | 2169 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,691 psi | 73% | 1378 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 37,507 psi | 86% | 2126 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 92% | 37,188 psi | 85% | 2116 fps | 96.7% |
| Shooters World AR Plus | <<locked>> | 84% | 38,972 psi | 90% | 2162 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 98% | 38,363 psi | 88% | 2201 fps | 96.6% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 38,972 psi | 90% | 2172 fps | 97.3% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 37,275 psi | 86% | 2110 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 36,898 psi | 85% | 2060 fps | 96.6% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 38,014 psi | 87% | 2096 fps | 97.9% |
| Somchem S335 | <<locked>> | 94% | 37,913 psi | 87% | 2103 fps | 97.9% |
| Vihtavuori N120 | <<locked>> | 82% | 38,856 psi | 89% | 2070 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 37,115 psi | 85% | 2070 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 94% | 38,769 psi | 89% | 2110 fps | 99.3% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 38,508 psi | 89% | 2188 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 98% | 38,624 psi | 89% | 2152 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 98% | 37,217 psi | 86% | 2146 fps | 96.7% |
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% | 25,628 psi | 59% | 1883 fps | 95.9% |
| Accurate 2460 | <<locked>> | 86% | 33,344 psi | 77% | 2064 fps | 95.5% |
| Accurate 2495 | <<locked>> | 86% | 22,336 psi | 51% | 1880 fps | 95% |
| Accurate 2520 | <<locked>> | 92% | 35,273 psi | 81% | 2136 fps | 95.7% |
| Accurate 4064 | <<locked>> | 96% | 29,588 psi | 68% | 2060 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 34,896 psi | 80% | 1985 fps | 97.4% |
| Accurate LT-32 | <<locked>> | 80% | 35,331 psi | 81% | 1988 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 36,361 psi | 84% | 2070 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 31,850 psi | 73% | 2037 fps | 96.3% |
| Alliant AR-Comp | 34.8 gr | 80% | 23,801 psi | 55% | 1890 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 30,124 psi | 69% | 1988 fps | 98.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 32,692 psi | 75% | 1972 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 80% | 29,240 psi | 67% | 1978 fps | 95.2% |
| Hodgdon H335 | <<locked>> | 84% | 33,373 psi | 77% | 2073 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,235 psi | 53% | 1194 fps | 100% |
| IMR 3031 | 37.4 gr | 86% | 27,514 psi | 63% | 1991 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 32,430 psi | 75% | 1985 fps | 99.5% |
| Lovex D073.4 | <<locked>> | 82% | 36,187 psi | 83% | 2113 fps | 95.7% |
| Lovex D073.6 | <<locked>> | 94% | 33,547 psi | 77% | 2116 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 33,808 psi | 78% | 2047 fps | 99.7% |
| Norma 202 | 39.8 gr | 90% | 31,430 psi | 72% | 2044 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,192 psi | 53% | 1227 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 35,172 psi | 81% | 2083 fps | 95% |
| Rottweil R 901 | <<locked>> | 88% | 33,011 psi | 76% | 2037 fps | 95.4% |
| Shooters World AR Plus | <<locked>> | 82% | 36,187 psi | 83% | 2113 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 94% | 33,547 psi | 77% | 2116 fps | 95.1% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 32,024 psi | 74% | 2041 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 30,763 psi | 71% | 1985 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 32,590 psi | 75% | 1982 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 29,588 psi | 68% | 1936 fps | 95.3% |
| Somchem S335 | <<locked>> | 86% | 29,689 psi | 68% | 1949 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 36,564 psi | 84% | 2037 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 28,979 psi | 67% | 1916 fps | 98% |
| Vihtavuori N133 | <<locked>> | 80% | 25,208 psi | 58% | 1837 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 86% | 24,831 psi | 57% | 1906 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 92% | 31,966 psi | 73% | 2031 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 94% | 32,663 psi | 75% | 2060 fps | 95.1% |
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 37 powders for 9.3 x 57 loaded with the .366 | 250gr | Fox Classic Hunter. IMR 3031 delivers the highest muzzle velocity at 2,201 fps; across all powders the maximum-charge window runs from 1,345 fps to 2,201 fps. Accurate 2495 gives the best case fill at 100 %, and 37 of the 37 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.366" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, 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. IMR 3031, Alliant AR-Comp, Norma 202 rank at the top here: for 9.3 x 57 with the .366 | 250gr | Fox Classic Hunter 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.