Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 220gr | Swift A-Frame bullet and 56 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 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 2495 | <<locked>> | 84% | 41,669 psi | 87% | 2244 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 41,785 psi | 87% | 2280 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 42,685 psi | 89% | 2362 fps | 97.9% |
| ADI AR 2206H | <<locked>> | 82% | 43,033 psi | 90% | 2293 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 86% | 41,510 psi | 87% | 2254 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 41,481 psi | 87% | 2365 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 43,178 psi | 90% | 2313 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 84% | 41,118 psi | 86% | 2280 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 96% | 42,772 psi | 89% | 2369 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 92% | 42,960 psi | 90% | 2402 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,272 psi | 72% | 2231 fps | 97% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 41,959 psi | 88% | 2297 fps | 97.7% |
| Bofors RP3 | <<locked>> | 88% | 43,033 psi | 90% | 2323 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 86% | 41,408 psi | 87% | 2280 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 41,771 psi | 87% | 2316 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 41,829 psi | 87% | 2326 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 73% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 41,858 psi | 87% | 2264 fps | 99% |
| IMR 3031 | <<locked>> | 82% | 42,714 psi | 89% | 2300 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 41,031 psi | 86% | 2238 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 41,104 psi | 86% | 2320 fps | 97.6% |
| IMR 4895 | <<locked>> | 84% | 42,061 psi | 88% | 2306 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 82% | 41,727 psi | 87% | 2277 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 43,308 psi | 90% | 2287 fps | 99.6% |
| Lovex S065 | <<locked>> | 92% | 42,351 psi | 88% | 2274 fps | 96.2% |
| Norma 201 | <<locked>> | 82% | 42,235 psi | 88% | 2254 fps | 99.5% |
| Norma 202 | <<locked>> | 82% | 42,322 psi | 88% | 2260 fps | 100% |
| Norma 203B | <<locked>> | 86% | 43,236 psi | 90% | 2320 fps | 98.9% |
| Norma URP | <<locked>> | 96% | 42,960 psi | 90% | 2359 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 86% | 42,612 psi | 89% | 2333 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,389 psi | 74% | 1486 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 42,859 psi | 90% | 2369 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 42,859 psi | 90% | 2408 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 42,496 psi | 89% | 2382 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,120 psi | 90% | 2392 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 84% | 42,757 psi | 89% | 2257 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 90% | 42,917 psi | 90% | 2316 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,351 psi | 88% | 2274 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 82% | 41,727 psi | 87% | 2277 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 43,308 psi | 90% | 2287 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 41,669 psi | 87% | 2320 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 43,192 psi | 90% | 2283 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 41,568 psi | 87% | 2270 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 40,843 psi | 85% | 2178 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 42,757 psi | 89% | 2280 fps | 98.7% |
| Somchem S355 | <<locked>> | 88% | 41,234 psi | 86% | 2274 fps | 98.9% |
| Somchem S365 | <<locked>> | 98% | 40,799 psi | 85% | 2365 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 84% | 41,901 psi | 88% | 2238 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 42,786 psi | 89% | 2251 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 41,974 psi | 88% | 2260 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 94% | 42,380 psi | 89% | 2316 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 41,147 psi | 86% | 2244 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 41,336 psi | 86% | 2316 fps | 97.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,492 psi | 76% | 2297 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 42,859 psi | 90% | 2303 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 82% | 40,756 psi | 85% | 2270 fps | 98.9% |
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% | 36,622 psi | 77% | 2162 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 34,650 psi | 72% | 2156 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 34,722 psi | 73% | 2218 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 40,495 psi | 85% | 2251 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 34,548 psi | 72% | 2123 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 36,477 psi | 76% | 2264 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,707 psi | 70% | 2139 fps | 97.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,361 psi | 76% | 2192 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,723 psi | 75% | 2228 fps | 95.8% |
| Alliant Reloder-17 | 44.4 gr | 82% | 31,053 psi | 65% | 2152 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,327 psi | 63% | 2136 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,233 psi | 82% | 2247 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 33,011 psi | 69% | 2139 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 36,347 psi | 76% | 2185 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,676 psi | 64% | 2093 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,535 psi | 76% | 2231 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 54% | 1296 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,102 psi | 82% | 2215 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 40,045 psi | 84% | 2257 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,245 psi | 76% | 2149 fps | 96.9% |
| IMR 4831 | <<locked>> | 90% | 33,808 psi | 71% | 2178 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 37,217 psi | 78% | 2218 fps | 97.7% |
| Lovex D073.6 | <<locked>> | 80% | 38,943 psi | 81% | 2231 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 35,781 psi | 75% | 2152 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 39,900 psi | 83% | 2231 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 39,755 psi | 83% | 2211 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 39,755 psi | 83% | 2218 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,752 psi | 75% | 2182 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 35,462 psi | 74% | 2218 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 35,099 psi | 73% | 2192 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,397 psi | 55% | 1329 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,463 psi | 78% | 2274 fps | 97.2% |
| ReloadSwiss RS 60 | 43.3 gr | 80% | 30,951 psi | 65% | 2159 fps | 98.3% |
| ReloadSwiss RS 62 | 48.6 gr | 90% | 34,679 psi | 72% | 2231 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 37,811 psi | 79% | 2287 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 37,826 psi | 79% | 2169 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 31,038 psi | 65% | 2090 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,900 psi | 83% | 2231 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,943 psi | 81% | 2231 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,781 psi | 75% | 2152 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,126 psi | 67% | 2133 fps | 95.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,422 psi | 84% | 2234 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,885 psi | 81% | 2221 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,982 psi | 71% | 2060 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 39,987 psi | 84% | 2234 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 32,242 psi | 67% | 2100 fps | 96.7% |
| Somchem S365 | <<locked>> | 84% | 26,310 psi | 55% | 2037 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 36,796 psi | 77% | 2156 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,536 psi | 78% | 2162 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,458 psi | 64% | 2044 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 35,012 psi | 73% | 2178 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 36,201 psi | 76% | 2156 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 36,405 psi | 76% | 2224 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 96% | 32,039 psi | 67% | 2201 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,066 psi | 61% | 2021 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,072 psi | 80% | 2224 fps | 98.4% |
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 56 powders for 8 x 57 IRS loaded with the .323 | 220gr | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,408 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,408 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 56 of the 56 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:14.0 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, ReloadSwiss RS 62 rank at the top here: for 8 x 57 IRS with the .323 | 220gr | Swift A-Frame 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.