Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 220gr | Sierra GameKing bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 62, Alliant Reloder-16 and ReloadSwiss RS 60.
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% | 41,263 psi | 86% | 2238 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 41,423 psi | 87% | 2274 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 42,308 psi | 88% | 2356 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 82% | 42,902 psi | 90% | 2290 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 86% | 41,147 psi | 86% | 2247 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 41,394 psi | 86% | 2362 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 43,047 psi | 90% | 2310 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 84% | 40,988 psi | 86% | 2277 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 96% | 42,438 psi | 89% | 2362 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 42,627 psi | 89% | 2395 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,069 psi | 71% | 2224 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 41,843 psi | 87% | 2293 fps | 97.7% |
| Bofors RP3 | <<locked>> | 88% | 42,641 psi | 89% | 2316 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 43,265 psi | 90% | 2316 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 86% | 41,307 psi | 86% | 2277 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 82% | 43,294 psi | 90% | 2300 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 41,452 psi | 87% | 2310 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 41,437 psi | 87% | 2320 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,070 psi | 73% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 41,466 psi | 87% | 2257 fps | 98.9% |
| IMR 3031 | <<locked>> | 82% | 42,322 psi | 88% | 2293 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 43,221 psi | 90% | 2274 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 40,727 psi | 85% | 2310 fps | 97.4% |
| IMR 4895 | <<locked>> | 84% | 41,974 psi | 88% | 2306 fps | 98.7% |
| Lovex D073.6 | <<locked>> | 82% | 41,336 psi | 86% | 2270 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 43,250 psi | 90% | 2234 fps | 98.8% |
| Lovex S062 | <<locked>> | 86% | 42,931 psi | 90% | 2277 fps | 99.6% |
| Lovex S065 | <<locked>> | 92% | 42,279 psi | 88% | 2270 fps | 96.2% |
| Norma 201 | <<locked>> | 82% | 41,887 psi | 88% | 2247 fps | 99.4% |
| Norma 202 | <<locked>> | 82% | 42,206 psi | 88% | 2257 fps | 100% |
| Norma 203B | <<locked>> | 86% | 42,888 psi | 90% | 2313 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 42,627 psi | 89% | 2356 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 86% | 42,525 psi | 89% | 2329 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,360 psi | 74% | 1486 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 42,757 psi | 89% | 2369 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 42,569 psi | 89% | 2402 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 42,192 psi | 88% | 2375 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,859 psi | 90% | 2385 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 84% | 42,351 psi | 88% | 2247 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 90% | 42,815 psi | 89% | 2313 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,279 psi | 88% | 2270 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 82% | 41,336 psi | 86% | 2270 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 42,931 psi | 90% | 2277 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 41,321 psi | 86% | 2313 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 42,873 psi | 90% | 2277 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 41,176 psi | 86% | 2260 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 40,741 psi | 85% | 2175 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 42,975 psi | 90% | 2211 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 42,656 psi | 89% | 2277 fps | 98.6% |
| Somchem S355 | <<locked>> | 88% | 40,901 psi | 85% | 2267 fps | 98.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,105 psi | 90% | 2402 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 84% | 41,452 psi | 87% | 2231 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 42,409 psi | 89% | 2241 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 41,872 psi | 87% | 2260 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 94% | 42,018 psi | 88% | 2306 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 84% | 40,756 psi | 85% | 2234 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 41,292 psi | 86% | 2313 fps | 97.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,172 psi | 76% | 2290 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 42,598 psi | 89% | 2297 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 84% | 43,250 psi | 90% | 2313 fps | 99.2% |
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% | 36,230 psi | 76% | 2156 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 34,301 psi | 72% | 2146 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 34,606 psi | 72% | 2215 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 40,103 psi | 84% | 2241 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 34,229 psi | 72% | 2113 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 36,187 psi | 76% | 2254 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,591 psi | 70% | 2136 fps | 97.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,998 psi | 75% | 2182 fps | 96.8% |
| Alliant Reloder-16 | 45 gr | 90% | 35,665 psi | 75% | 2228 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,777 psi | 64% | 2142 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,255 psi | 63% | 2133 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,928 psi | 81% | 2241 fps | 97% |
| Bofors RP3 | <<locked>> | 80% | 32,866 psi | 69% | 2133 fps | 97.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,422 psi | 84% | 2270 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 82% | 36,216 psi | 76% | 2182 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 40,451 psi | 85% | 2251 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,589 psi | 64% | 2090 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,448 psi | 76% | 2228 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,976 psi | 54% | 1293 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,972 psi | 81% | 2211 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 39,581 psi | 83% | 2251 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,868 psi | 75% | 2142 fps | 96.8% |
| IMR 4831 | <<locked>> | 90% | 33,721 psi | 70% | 2178 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 36,840 psi | 77% | 2211 fps | 97.6% |
| Lovex D073.6 | <<locked>> | 80% | 38,812 psi | 81% | 2228 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,727 psi | 85% | 2192 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 35,665 psi | 75% | 2149 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 39,813 psi | 83% | 2224 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 39,363 psi | 82% | 2201 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 39,639 psi | 83% | 2215 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,389 psi | 74% | 2175 fps | 97.2% |
| Norma URP | <<locked>> | 90% | 35,375 psi | 74% | 2218 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 34,795 psi | 73% | 2185 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,324 psi | 55% | 1325 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,333 psi | 78% | 2267 fps | 97.2% |
| ReloadSwiss RS 60 | 43 gr | 80% | 30,676 psi | 64% | 2149 fps | 98.2% |
| ReloadSwiss RS 62 | 48.4 gr | 90% | 34,606 psi | 72% | 2228 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 40,393 psi | 84% | 2339 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,652 psi | 79% | 2165 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,937 psi | 65% | 2087 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,813 psi | 83% | 2224 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,812 psi | 81% | 2228 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,665 psi | 75% | 2149 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,053 psi | 67% | 2129 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,030 psi | 84% | 2228 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,783 psi | 81% | 2218 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,823 psi | 71% | 2057 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 40,437 psi | 84% | 2172 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,668 psi | 83% | 2228 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 31,908 psi | 67% | 2093 fps | 96.5% |
| Somchem S365 | <<locked>> | 84% | 26,063 psi | 54% | 2028 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 36,637 psi | 77% | 2152 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,420 psi | 78% | 2162 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,327 psi | 63% | 2041 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 34,679 psi | 72% | 2169 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 35,882 psi | 75% | 2149 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 36,274 psi | 76% | 2221 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 96% | 31,937 psi | 67% | 2198 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,908 psi | 65% | 2067 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,000 psi | 79% | 2221 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 85 powders for 8 x 57 IRS loaded with the .323 | 220gr | Sierra GameKing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,402 fps; across all powders the maximum-charge window runs from 1,450 fps to 2,402 fps. Accurate 3100 gives the best case fill at 100 %, and 85 of the 85 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 63–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 62, Alliant Reloder-16, ReloadSwiss RS 60 rank at the top here: for 8 x 57 IRS with the .323 | 220gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, ADI AR 2209 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.