Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 200gr | Barnes XLC S bullet and 51 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 SNPE Vectan SP 11.
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% | 42,351 psi | 88% | 2339 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 42,177 psi | 88% | 2369 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 41,974 psi | 88% | 2434 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 42,598 psi | 89% | 2369 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 40,944 psi | 86% | 2323 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 40,828 psi | 85% | 2428 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 42,844 psi | 90% | 2392 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 84% | 40,683 psi | 85% | 2352 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 42,134 psi | 88% | 2431 fps | 96.3% |
| Alliant Reloder-17 | <<locked>> | 92% | 42,003 psi | 88% | 2464 fps | 98% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 41,234 psi | 86% | 2365 fps | 96.3% |
| Bofors RP3 | <<locked>> | 88% | 42,699 psi | 89% | 2402 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 82% | 43,076 psi | 90% | 2402 fps | 99.3% |
| Hodgdon H4895 | <<locked>> | 82% | 42,902 psi | 90% | 2379 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 41,176 psi | 86% | 2385 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 41,118 psi | 86% | 2398 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 74% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 42,946 psi | 90% | 2365 fps | 98.2% |
| IMR 3031 | <<locked>> | 84% | 40,901 psi | 85% | 2365 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 42,482 psi | 89% | 2346 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,683 psi | 85% | 2392 fps | 96.1% |
| IMR 4895 | <<locked>> | 84% | 41,611 psi | 87% | 2382 fps | 97.6% |
| Lovex D073.6 | <<locked>> | 82% | 41,495 psi | 87% | 2359 fps | 99.6% |
| Lovex S060 | <<locked>> | 82% | 43,076 psi | 90% | 2313 fps | 97.8% |
| Lovex S062 | <<locked>> | 86% | 43,004 psi | 90% | 2362 fps | 98.9% |
| Norma 201 | <<locked>> | 82% | 42,293 psi | 88% | 2333 fps | 98.8% |
| Norma 202 | <<locked>> | 82% | 41,887 psi | 88% | 2343 fps | 99.9% |
| Norma 203B | <<locked>> | 86% | 42,685 psi | 89% | 2395 fps | 97.8% |
| Norma URP | <<locked>> | 96% | 42,003 psi | 88% | 2425 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 86% | 41,843 psi | 87% | 2402 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,650 psi | 74% | 1552 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 41,945 psi | 88% | 2441 fps | 97.1% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 41,916 psi | 88% | 2474 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 84% | 42,743 psi | 89% | 2333 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 90% | 42,598 psi | 89% | 2392 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 41,495 psi | 87% | 2359 fps | 99.6% |
| Shooters World Precision | <<locked>> | 86% | 43,004 psi | 90% | 2362 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 40,814 psi | 85% | 2388 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 41,002 psi | 86% | 2339 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 42,830 psi | 89% | 2293 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 43,178 psi | 90% | 2300 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 42,119 psi | 88% | 2352 fps | 97.5% |
| Somchem S355 | <<locked>> | 88% | 40,988 psi | 86% | 2352 fps | 97.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,409 psi | 89% | 2474 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 84% | 41,365 psi | 86% | 2323 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 42,192 psi | 88% | 2326 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 41,481 psi | 87% | 2336 fps | 99% |
| Vihtavuori N160 | <<locked>> | 94% | 41,408 psi | 87% | 2375 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 86% | 43,134 psi | 90% | 2362 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 96% | 43,134 psi | 90% | 2428 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 42,119 psi | 88% | 2365 fps | 98% |
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% | 37,652 psi | 79% | 2257 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 35,491 psi | 74% | 2244 fps | 99.4% |
| Accurate 4350 | <<locked>> | 94% | 39,189 psi | 82% | 2382 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 40,219 psi | 84% | 2323 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 36,463 psi | 76% | 2234 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 38,580 psi | 81% | 2379 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,634 psi | 70% | 2211 fps | 96.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,245 psi | 76% | 2264 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 94% | 39,798 psi | 83% | 2385 fps | 95.5% |
| Alliant Reloder-17 | 46 gr | 86% | 35,128 psi | 73% | 2313 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,754 psi | 81% | 2316 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 33,330 psi | 70% | 2215 fps | 96.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,451 psi | 85% | 2352 fps | 98.9% |
| Hodgdon H4895 | <<locked>> | 80% | 40,495 psi | 85% | 2336 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,592 psi | 72% | 2251 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,418 psi | 72% | 2260 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 55% | 1352 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,201 psi | 76% | 2238 fps | 96.6% |
| IMR 3031 | <<locked>> | 80% | 36,289 psi | 76% | 2280 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,824 psi | 75% | 2215 fps | 95.3% |
| IMR 4831 | <<locked>> | 98% | 38,624 psi | 81% | 2352 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 37,028 psi | 77% | 2290 fps | 96.4% |
| Lovex D073.6 | <<locked>> | 80% | 38,899 psi | 81% | 2310 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 40,727 psi | 85% | 2270 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 36,201 psi | 76% | 2231 fps | 97.5% |
| Norma 201 | <<locked>> | 80% | 39,929 psi | 83% | 2290 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 39,508 psi | 83% | 2300 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,650 psi | 74% | 2254 fps | 95.9% |
| Norma URP | <<locked>> | 94% | 39,595 psi | 83% | 2379 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 34,969 psi | 73% | 2260 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 56% | 1385 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,057 psi | 77% | 2339 fps | 95.6% |
| ReloadSwiss RS 60 | 42.8 gr | 80% | 31,169 psi | 65% | 2224 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 80% | 38,072 psi | 80% | 2247 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 31,691 psi | 66% | 2172 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,899 psi | 81% | 2310 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 36,201 psi | 76% | 2231 fps | 97.5% |
| SNPE Vectan SP 11 | 43.2 gr | 82% | 34,229 psi | 72% | 2247 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,522 psi | 80% | 2290 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,084 psi | 71% | 2136 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 40,785 psi | 85% | 2257 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,494 psi | 83% | 2303 fps | 96.9% |
| Somchem S355 | <<locked>> | 80% | 32,532 psi | 68% | 2175 fps | 95.3% |
| Somchem S365 | <<locked>> | 88% | 30,052 psi | 63% | 2198 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 36,883 psi | 77% | 2244 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,492 psi | 78% | 2244 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 30,864 psi | 64% | 2123 fps | 96.3% |
| Vihtavuori N160 | <<locked>> | 92% | 39,088 psi | 82% | 2333 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 36,129 psi | 75% | 2234 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 94% | 40,727 psi | 85% | 2385 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,098 psi | 69% | 2178 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 51 powders for 8 x 57 IRS loaded with the .323 | 200gr | Barnes XLC S. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,474 fps; across all powders the maximum-charge window runs from 1,516 fps to 2,474 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 51 of the 51 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 200.0 gr projectile in 0.323" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, IMR 4831, 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, SNPE Vectan SP 11 rank at the top here: for 8 x 57 IRS with the .323 | 200gr | Barnes XLC 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.