Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 200gr | Nosler Partition bullet and 61 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>> | 86% | 42,018 psi | 88% | 2375 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 42,047 psi | 88% | 2408 fps | 99.8% |
| Accurate 4064 | <<locked>> | 88% | 42,047 psi | 88% | 2408 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 42,830 psi | 89% | 2487 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 40,959 psi | 86% | 2375 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 88% | 41,901 psi | 88% | 2379 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 43,076 psi | 90% | 2388 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 82% | 42,395 psi | 89% | 2388 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 42,235 psi | 88% | 2497 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 41,249 psi | 86% | 2402 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 86% | 41,582 psi | 87% | 2411 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 96% | 40,698 psi | 85% | 2444 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 92% | 40,654 psi | 85% | 2477 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,714 psi | 89% | 2431 fps | 97% |
| Bofors RP3 | <<locked>> | 88% | 40,611 psi | 85% | 2405 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 82% | 41,379 psi | 86% | 2408 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 88% | 41,887 psi | 88% | 2408 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 41,292 psi | 86% | 2388 fps | 98.3% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,235 psi | 88% | 2441 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 42,308 psi | 88% | 2457 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,679 psi | 72% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 41,829 psi | 87% | 2385 fps | 98.3% |
| IMR 3031 | <<locked>> | 86% | 42,076 psi | 88% | 2421 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 40,973 psi | 86% | 2356 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 39,073 psi | 82% | 2398 fps | 96% |
| IMR 4895 | <<locked>> | 86% | 42,525 psi | 89% | 2438 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 82% | 43,076 psi | 90% | 2388 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 84% | 42,047 psi | 88% | 2408 fps | 99.8% |
| Lovex S060 | <<locked>> | 82% | 41,611 psi | 87% | 2326 fps | 97.8% |
| Lovex S062 | <<locked>> | 86% | 41,089 psi | 86% | 2369 fps | 98.8% |
| Norma 201 | <<locked>> | 84% | 42,786 psi | 89% | 2385 fps | 99.1% |
| Norma 202 | <<locked>> | 84% | 43,018 psi | 90% | 2398 fps | 100% |
| Norma 203B | <<locked>> | 86% | 40,843 psi | 85% | 2398 fps | 97.7% |
| Norma URP | <<locked>> | 96% | 40,553 psi | 85% | 2438 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 86% | 40,451 psi | 85% | 2411 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 42,163 psi | 88% | 2408 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,157 psi | 73% | 1572 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 40,495 psi | 85% | 2451 fps | 97.1% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 40,669 psi | 85% | 2487 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 42,757 psi | 89% | 2503 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 86% | 43,207 psi | 90% | 2385 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 90% | 40,727 psi | 85% | 2398 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 42,047 psi | 88% | 2408 fps | 99.8% |
| Shooters World Precision | <<locked>> | 86% | 41,089 psi | 86% | 2369 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 41,974 psi | 88% | 2448 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 42,032 psi | 88% | 2398 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 42,090 psi | 88% | 2306 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 41,626 psi | 87% | 2310 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 41,466 psi | 87% | 2310 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 40,611 psi | 85% | 2362 fps | 97.5% |
| Somchem S355 | <<locked>> | 90% | 41,568 psi | 87% | 2402 fps | 98.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,988 psi | 86% | 2487 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 42,206 psi | 88% | 2306 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 42,308 psi | 88% | 2372 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 40,640 psi | 85% | 2336 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 42,453 psi | 89% | 2392 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 96% | 42,786 psi | 89% | 2441 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 82% | 43,163 psi | 90% | 2388 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 86% | 41,524 psi | 87% | 2372 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 96% | 41,829 psi | 87% | 2444 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 40,756 psi | 85% | 2379 fps | 98.1% |
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% | 34,418 psi | 72% | 2244 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,349 psi | 82% | 2359 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 32,518 psi | 68% | 2228 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 37,347 psi | 78% | 2385 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 38,609 psi | 81% | 2333 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 34,896 psi | 73% | 2241 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,611 psi | 85% | 2346 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 39,697 psi | 83% | 2346 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 37,144 psi | 78% | 2388 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,966 psi | 67% | 2215 fps | 96% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,548 psi | 72% | 2267 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,435 psi | 80% | 2398 fps | 95.6% |
| Alliant Reloder-17 | 48 gr | 86% | 33,562 psi | 70% | 2320 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,333 psi | 78% | 2326 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 31,125 psi | 65% | 2208 fps | 95.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,522 psi | 80% | 2356 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 39,218 psi | 82% | 2356 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 38,914 psi | 81% | 2343 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,822 psi | 69% | 2251 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,779 psi | 68% | 2264 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,730 psi | 54% | 1368 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,737 psi | 73% | 2244 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 34,650 psi | 72% | 2287 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,185 psi | 71% | 2218 fps | 95.2% |
| IMR 4831 | <<locked>> | 98% | 36,782 psi | 77% | 2356 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 35,317 psi | 74% | 2297 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 80% | 40,611 psi | 85% | 2346 fps | 98.7% |
| Lovex D073.6 | <<locked>> | 80% | 36,999 psi | 77% | 2316 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 39,247 psi | 82% | 2280 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 34,142 psi | 71% | 2231 fps | 97.2% |
| Norma 201 | <<locked>> | 80% | 37,724 psi | 79% | 2290 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 37,927 psi | 79% | 2306 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 33,953 psi | 71% | 2257 fps | 95.7% |
| Norma URP | <<locked>> | 94% | 38,232 psi | 80% | 2388 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 33,214 psi | 69% | 2260 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,508 psi | 83% | 2359 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,005 psi | 54% | 1401 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,360 psi | 74% | 2346 fps | 95.5% |
| ReloadSwiss RS 60 | 44.6 gr | 80% | 29,356 psi | 61% | 2218 fps | 96.4% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,972 psi | 84% | 2451 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 35,940 psi | 75% | 2247 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 31,227 psi | 65% | 2205 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,999 psi | 77% | 2316 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 34,142 psi | 71% | 2231 fps | 97.2% |
| SNPE Vectan SP 11 | 46.1 gr | 84% | 34,650 psi | 72% | 2300 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,941 psi | 77% | 2300 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,378 psi | 82% | 2260 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,329 psi | 68% | 2139 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 38,870 psi | 81% | 2264 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 38,029 psi | 79% | 2313 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 32,503 psi | 68% | 2218 fps | 95.7% |
| Somchem S365 | <<locked>> | 88% | 28,297 psi | 59% | 2192 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 39,494 psi | 83% | 2260 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,795 psi | 73% | 2244 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,766 psi | 75% | 2247 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 28,848 psi | 60% | 2116 fps | 95.9% |
| Vihtavuori N160 | <<locked>> | 92% | 37,550 psi | 78% | 2343 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 40,379 psi | 84% | 2339 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 80% | 34,360 psi | 72% | 2238 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 94% | 39,189 psi | 82% | 2392 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,663 psi | 70% | 2234 fps | 95.9% |
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 | 200gr | Nosler Partition. ReloadSwiss RS 62 delivers the highest muzzle velocity at 2,503 fps; across all powders the maximum-charge window runs from 1,532 fps to 2,503 fps. Alliant Reloder-23 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 68–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.323" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, Hodgdon Hybrid 100V 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 | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Alliant Reloder-26 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.