Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 220gr | Barnes X S bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Accurate 4350.
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>> | 82% | 41,727 psi | 87% | 2195 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 41,481 psi | 87% | 2228 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 41,205 psi | 86% | 2293 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 86% | 42,119 psi | 88% | 2221 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 42,409 psi | 89% | 2336 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 41,800 psi | 87% | 2247 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 84% | 42,337 psi | 88% | 2257 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,162 psi | 86% | 2293 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 90% | 41,075 psi | 86% | 2323 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,476 psi | 74% | 2211 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 42,830 psi | 89% | 2270 fps | 97.5% |
| Bofors RP3 | <<locked>> | 86% | 41,655 psi | 87% | 2257 fps | 99% |
| Hodgdon H380 | <<locked>> | 86% | 42,685 psi | 89% | 2257 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 42,627 psi | 89% | 2287 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 42,467 psi | 89% | 2297 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 74% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 42,540 psi | 89% | 2234 fps | 98.8% |
| IMR 4064 | <<locked>> | 84% | 41,887 psi | 88% | 2208 fps | 97.9% |
| IMR 4831 | <<locked>> | 96% | 42,134 psi | 88% | 2293 fps | 97.3% |
| IMR 4895 | <<locked>> | 84% | 43,221 psi | 90% | 2283 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 82% | 43,018 psi | 90% | 2254 fps | 99.9% |
| Lovex S062 | <<locked>> | 84% | 42,003 psi | 88% | 2218 fps | 99.2% |
| Norma 203B | <<locked>> | 84% | 41,611 psi | 87% | 2247 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 41,263 psi | 86% | 2287 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 84% | 40,930 psi | 86% | 2260 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,027 psi | 75% | 1467 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 40,973 psi | 86% | 2293 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 41,089 psi | 86% | 2333 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 43,308 psi | 90% | 2349 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 41,800 psi | 87% | 2192 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 88% | 41,756 psi | 87% | 2251 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 43,018 psi | 90% | 2254 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 42,003 psi | 88% | 2218 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 42,511 psi | 89% | 2293 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 42,351 psi | 88% | 2241 fps | 98.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 41,872 psi | 87% | 2152 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 42,496 psi | 89% | 2251 fps | 98.8% |
| Somchem S365 | <<locked>> | 98% | 41,713 psi | 87% | 2336 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 84% | 43,149 psi | 90% | 2215 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 41,162 psi | 86% | 2182 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 43,178 psi | 90% | 2241 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 94% | 43,120 psi | 90% | 2283 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 42,163 psi | 88% | 2218 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 42,366 psi | 89% | 2290 fps | 96.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,739 psi | 79% | 2277 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 40,843 psi | 85% | 2224 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 82% | 41,669 psi | 87% | 2244 fps | 98.7% |
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 2495 | <<locked>> | 80% | 39,189 psi | 82% | 2156 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,028 psi | 77% | 2149 fps | 99.9% |
| Accurate 4350 | 43.9 gr | 90% | 36,230 psi | 76% | 2201 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 35,534 psi | 74% | 2100 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,405 psi | 78% | 2234 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,012 psi | 73% | 2123 fps | 97.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,478 psi | 78% | 2169 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,840 psi | 77% | 2205 fps | 95.6% |
| Alliant Reloder-17 | 42 gr | 82% | 32,343 psi | 68% | 2136 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,705 psi | 66% | 2123 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,089 psi | 84% | 2221 fps | 96.8% |
| Bofors RP3 | <<locked>> | 80% | 34,809 psi | 73% | 2129 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 37,753 psi | 79% | 2169 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,313 psi | 63% | 2037 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,623 psi | 79% | 2208 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 56% | 1276 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,074 psi | 84% | 2192 fps | 98.3% |
| IMR 4064 | <<locked>> | 80% | 37,275 psi | 78% | 2126 fps | 96.7% |
| IMR 4831 | <<locked>> | 90% | 35,085 psi | 73% | 2162 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 38,305 psi | 80% | 2195 fps | 97.6% |
| Lovex D073.6 | <<locked>> | 80% | 40,393 psi | 84% | 2211 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 37,449 psi | 78% | 2136 fps | 98.5% |
| Norma 203B | <<locked>> | 80% | 36,883 psi | 77% | 2162 fps | 97.2% |
| Norma URP | <<locked>> | 90% | 36,782 psi | 77% | 2201 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 36,143 psi | 76% | 2169 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 56% | 1306 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,493 psi | 80% | 2247 fps | 97.1% |
| ReloadSwiss RS 60 | 41 gr | 80% | 32,300 psi | 67% | 2142 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,406 psi | 80% | 2260 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 39,392 psi | 82% | 2149 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,866 psi | 69% | 2083 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,393 psi | 84% | 2211 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 37,449 psi | 78% | 2136 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,388 psi | 70% | 2113 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,885 psi | 83% | 2195 fps | 97.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,172 psi | 73% | 2041 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 33,765 psi | 71% | 2087 fps | 96.7% |
| Somchem S365 | <<locked>> | 84% | 28,021 psi | 59% | 2034 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 38,203 psi | 80% | 2139 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,711 psi | 81% | 2142 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 31,923 psi | 67% | 2034 fps | 97.6% |
| Vihtavuori N160 | <<locked>> | 88% | 36,245 psi | 76% | 2159 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 37,376 psi | 78% | 2136 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 37,623 psi | 79% | 2205 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 33,518 psi | 70% | 2188 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,487 psi | 64% | 2008 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,233 psi | 82% | 2201 fps | 98.3% |
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 47 powders for 8 x 57 IRS loaded with the .323 | 220gr | Barnes X S. ReloadSwiss RS 62 delivers the highest muzzle velocity at 2,349 fps; across all powders the maximum-charge window runs from 1,427 fps to 2,349 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, 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. ReloadSwiss RS 60, Alliant Reloder-17, Accurate 4350 rank at the top here: for 8 x 57 IRS with the .323 | 220gr | Barnes X S 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.