Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 250gr | Woodleigh RN SN bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 62.
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 3100ᴾ | <<locked>> | 100% | 39,436 psi | 82% | 2152 fps | 96.8% |
| Accurate 4064 | <<locked>> | 82% | 41,089 psi | 86% | 2113 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,206 psi | 88% | 2205 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 84% | 42,699 psi | 89% | 2129 fps | 99.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,815 psi | 89% | 2244 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,163 psi | 88% | 2149 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,598 psi | 89% | 2159 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,858 psi | 87% | 2215 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,800 psi | 87% | 2238 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,101 psi | 80% | 2178 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,090 psi | 88% | 2310 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 42,003 psi | 88% | 2156 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 42,757 psi | 89% | 2129 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 84% | 43,033 psi | 90% | 2165 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 90% | 42,221 psi | 88% | 2201 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,089 psi | 86% | 2162 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 74% | 1362 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,148 psi | 88% | 2116 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 42,917 psi | 90% | 2159 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,858 psi | 87% | 2116 fps | 96.1% |
| IMR 4831 | <<locked>> | 94% | 43,207 psi | 90% | 2205 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 42,076 psi | 88% | 2116 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 41,365 psi | 86% | 2116 fps | 97.5% |
| Lovex S070 | <<locked>> | 90% | 41,727 psi | 87% | 2142 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 41,945 psi | 88% | 2149 fps | 99.5% |
| Norma MRPᴾ | <<locked>> | 100% | 42,264 psi | 88% | 2274 fps | 96.2% |
| Norma URP | <<locked>> | 92% | 42,192 psi | 88% | 2201 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 82% | 41,394 psi | 86% | 2165 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 92% | 41,089 psi | 86% | 2192 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,998 psi | 75% | 1394 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,654 psi | 85% | 2106 fps | 96.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,640 psi | 87% | 2238 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,626 psi | 87% | 2221 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,974 psi | 88% | 2238 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 86% | 42,177 psi | 88% | 2152 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 88% | 42,757 psi | 89% | 2129 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,365 psi | 86% | 2116 fps | 97.5% |
| Shooters World Precision | <<locked>> | 82% | 42,076 psi | 88% | 2116 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 41,727 psi | 87% | 2142 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,308 psi | 90% | 2198 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,134 psi | 88% | 2047 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 40,857 psi | 85% | 2073 fps | 96% |
| Somchem S355 | <<locked>> | 86% | 42,873 psi | 90% | 2152 fps | 99.8% |
| Somchem S365 | <<locked>> | 96% | 42,931 psi | 90% | 2247 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 42,598 psi | 89% | 2192 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 86% | 41,017 psi | 86% | 2100 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 41,495 psi | 87% | 2156 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 42,322 psi | 88% | 2110 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,279 psi | 90% | 2201 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,408 psi | 87% | 2238 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,350 psi | 86% | 2142 fps | 99.8% |
| Winchester 760 | <<locked>> | 90% | 42,221 psi | 88% | 2201 fps | 96.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,823 psi | 71% | 2185 fps | 99.4% |
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 3100 | <<locked>> | 96% | 34,287 psi | 72% | 2060 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,580 psi | 81% | 2073 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,023 psi | 63% | 1982 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 37,739 psi | 79% | 2047 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,972 psi | 84% | 2195 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,231 psi | 78% | 2064 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,059 psi | 84% | 2116 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 30,864 psi | 64% | 1991 fps | 95.8% |
| Alliant Reloder-17 | 42.8 gr | 80% | 32,082 psi | 67% | 2047 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 26,600 psi | 56% | 1923 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 32,053 psi | 67% | 2103 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 36,767 psi | 77% | 2070 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 40,219 psi | 84% | 2087 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 37,739 psi | 79% | 2073 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 37,115 psi | 78% | 2110 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,658 psi | 56% | 1873 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 55% | 1211 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,581 psi | 83% | 2073 fps | 98.9% |
| IMR 4350 | <<locked>> | 90% | 40,161 psi | 84% | 2110 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 39,436 psi | 82% | 2073 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 29,298 psi | 61% | 1949 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 39,537 psi | 83% | 2077 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 34,505 psi | 72% | 1991 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 36,941 psi | 77% | 2057 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 39,421 psi | 82% | 2110 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 39,537 psi | 83% | 2224 fps | 95.3% |
| Norma URP | <<locked>> | 82% | 30,763 psi | 64% | 1985 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 38,653 psi | 81% | 2119 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 36,216 psi | 76% | 2103 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 56% | 1243 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,029 psi | 79% | 2060 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,156 psi | 71% | 2100 fps | 99.9% |
| ReloadSwiss RS 62 | 43.8 gr | 82% | 29,892 psi | 62% | 1995 fps | 95% |
| ReloadSwiss RS 70 | 46.7 gr | 86% | 34,403 psi | 72% | 2090 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 34,606 psi | 72% | 2024 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 40,219 psi | 84% | 2087 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,505 psi | 72% | 1991 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 39,537 psi | 83% | 2077 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 36,941 psi | 77% | 2057 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,520 psi | 74% | 2067 fps | 98.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,333 psi | 78% | 1978 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 38,072 psi | 80% | 2028 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 35,563 psi | 74% | 2031 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 25,860 psi | 54% | 1906 fps | 97.1% |
| Somchem S385 | <<locked>> | 96% | 40,030 psi | 84% | 2149 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 33,678 psi | 70% | 1978 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 30,081 psi | 63% | 1942 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 39,798 psi | 83% | 2073 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,386 psi | 66% | 1985 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 28,282 psi | 59% | 1982 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,921 psi | 63% | 1926 fps | 97.3% |
| Winchester 760 | <<locked>> | 86% | 37,115 psi | 78% | 2110 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,382 psi | 55% | 1978 fps | 95.6% |
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 53 powders for 8 x 57 IRS loaded with the .323 | 250gr | Woodleigh RN SN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,310 fps; across all powders the maximum-charge window runs from 1,362 fps to 2,310 fps. Accurate 3100 gives the best case fill at 100 %, and 53 of the 53 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.323" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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 70, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for 8 x 57 IRS with the .323 | 250gr | Woodleigh RN SN 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.