Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 180gr | Hornady GMX 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, Hodgdon LEVERevolution and Bofors RP3.
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 2015 | <<locked>> | 86% | 42,786 psi | 89% | 2457 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 40,683 psi | 85% | 2451 fps | 99.1% |
| Accurate 2495 | <<locked>> | 92% | 41,220 psi | 86% | 2493 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 41,292 psi | 86% | 2500 fps | 99% |
| Accurate 4064 | <<locked>> | 94% | 40,988 psi | 86% | 2516 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 41,756 psi | 87% | 2500 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 41,553 psi | 87% | 2470 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 88% | 42,612 psi | 89% | 2526 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 41,901 psi | 88% | 2549 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 41,205 psi | 86% | 2513 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 82% | 43,076 psi | 90% | 2470 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 42,264 psi | 88% | 2530 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 41,539 psi | 87% | 2585 fps | 96.4% |
| Bofors RP3 | <<locked>> | 94% | 40,553 psi | 85% | 2516 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 41,582 psi | 87% | 2428 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 88% | 41,916 psi | 88% | 2533 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 82% | 41,872 psi | 87% | 2490 fps | 99.8% |
| Hodgdon H335 | <<locked>> | 82% | 42,496 psi | 89% | 2507 fps | 99.5% |
| Hodgdon H4895 | <<locked>> | 88% | 42,018 psi | 88% | 2513 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 42,975 psi | 90% | 2579 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,663 psi | 70% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 40,901 psi | 85% | 2474 fps | 96.6% |
| IMR 3031 | <<locked>> | 90% | 43,192 psi | 90% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 42,337 psi | 88% | 2484 fps | 95.9% |
| IMR 4895 | <<locked>> | 92% | 43,236 psi | 90% | 2562 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 86% | 41,553 psi | 87% | 2470 fps | 97.5% |
| Lovex D073.5 | <<locked>> | 82% | 40,364 psi | 84% | 2451 fps | 98.1% |
| Lovex D073.6 | <<locked>> | 90% | 42,293 psi | 88% | 2530 fps | 99.1% |
| Lovex S060 | <<locked>> | 88% | 43,076 psi | 90% | 2451 fps | 96.6% |
| Lovex S062 | <<locked>> | 92% | 41,423 psi | 87% | 2484 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 40,828 psi | 85% | 2461 fps | 97.5% |
| Norma 202 | <<locked>> | 88% | 40,843 psi | 85% | 2477 fps | 99.3% |
| Norma 203B | <<locked>> | 92% | 41,452 psi | 87% | 2520 fps | 96.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 40,480 psi | 85% | 2484 fps | 95.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 42,786 psi | 89% | 2470 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,692 psi | 70% | 1621 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 41,249 psi | 86% | 2461 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 41,452 psi | 87% | 2598 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 86% | 42,032 psi | 88% | 2464 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 90% | 41,031 psi | 86% | 2457 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 98% | 42,960 psi | 90% | 2552 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 42,293 psi | 88% | 2530 fps | 99.1% |
| Shooters World Precision | <<locked>> | 92% | 41,423 psi | 87% | 2484 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 42,830 psi | 89% | 2566 fps | 96.3% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 43,047 psi | 90% | 2520 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 43,192 psi | 90% | 2434 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 42,438 psi | 89% | 2434 fps | 99.8% |
| Somchem S321 | <<locked>> | 84% | 41,916 psi | 88% | 2500 fps | 97.9% |
| Somchem S335 | <<locked>> | 88% | 42,293 psi | 88% | 2438 fps | 99.8% |
| Somchem S341 | <<locked>> | 88% | 41,727 psi | 87% | 2487 fps | 96.1% |
| Somchem S355 | <<locked>> | 96% | 41,626 psi | 87% | 2513 fps | 96.8% |
| Vihtavuori N130 | <<locked>> | 82% | 40,915 psi | 85% | 2385 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 43,091 psi | 90% | 2438 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 42,119 psi | 88% | 2493 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 41,365 psi | 86% | 2464 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 98% | 42,656 psi | 89% | 2503 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 86% | 41,582 psi | 87% | 2467 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 92% | 42,395 psi | 89% | 2500 fps | 99.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 42,047 psi | 88% | 2487 fps | 96.5% |
| Winchester 748 | <<locked>> | 88% | 42,917 psi | 90% | 2556 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 90% | 42,090 psi | 88% | 2523 fps | 97% |
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 2015 | <<locked>> | 80% | 35,302 psi | 74% | 2323 fps | 99.8% |
| Accurate 2460 | <<locked>> | 80% | 37,869 psi | 79% | 2402 fps | 98.6% |
| Accurate 2495 | <<locked>> | 80% | 27,195 psi | 57% | 2205 fps | 98.6% |
| Accurate 2520 | <<locked>> | 80% | 33,373 psi | 70% | 2343 fps | 97.2% |
| Accurate 4064 | <<locked>> | 80% | 25,788 psi | 54% | 2175 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 86% | 39,189 psi | 82% | 2451 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 34,316 psi | 72% | 2323 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 80% | 32,489 psi | 68% | 2343 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 39,175 psi | 82% | 2497 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 36,129 psi | 75% | 2415 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 40,321 psi | 84% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 39,610 psi | 83% | 2480 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 96% | 38,711 psi | 81% | 2523 fps | 95.3% |
| Bofors RP3 | 45.8 gr | 90% | 35,186 psi | 74% | 2408 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,695 psi | 77% | 2333 fps | 96.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 31,676 psi | 66% | 2320 fps | 95.2% |
| Hodgdon H322 | <<locked>> | 80% | 39,146 psi | 82% | 2438 fps | 99.6% |
| Hodgdon H335 | <<locked>> | 80% | 39,624 psi | 83% | 2454 fps | 99.1% |
| Hodgdon H4895 | <<locked>> | 84% | 36,970 psi | 77% | 2411 fps | 95.5% |
| Hodgdon LEVERevolution | 45.3 gr | 86% | 35,360 psi | 74% | 2421 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,845 psi | 52% | 1414 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 35,969 psi | 75% | 2372 fps | 95% |
| IMR 3031 | <<locked>> | 80% | 31,096 psi | 65% | 2326 fps | 98.8% |
| IMR 4064 | <<locked>> | 90% | 39,711 psi | 83% | 2434 fps | 95.1% |
| IMR 4895 | <<locked>> | 88% | 37,753 psi | 79% | 2457 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 34,316 psi | 72% | 2323 fps | 95.4% |
| Lovex D073.5 | <<locked>> | 80% | 37,797 psi | 79% | 2402 fps | 97.6% |
| Lovex D073.6 | <<locked>> | 80% | 29,849 psi | 62% | 2274 fps | 95.8% |
| Lovex S060 | <<locked>> | 84% | 38,247 psi | 80% | 2359 fps | 95.2% |
| Lovex S062 | <<locked>> | 86% | 34,330 psi | 72% | 2343 fps | 95.6% |
| Norma 201 | <<locked>> | 82% | 33,620 psi | 70% | 2310 fps | 95.3% |
| Norma 202 | <<locked>> | 80% | 31,589 psi | 66% | 2283 fps | 97.2% |
| Norma 203B | <<locked>> | 90% | 38,856 psi | 81% | 2467 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 37,768 psi | 79% | 2431 fps | 95% |
| Ramshot X-Terminator | <<locked>> | 82% | 39,987 psi | 84% | 2418 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,729 psi | 52% | 1444 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,667 psi | 81% | 2415 fps | 98.1% |
| ReloadSwiss RS 60 | 46.5 gr | 88% | 31,923 psi | 67% | 2372 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 34,896 psi | 73% | 2323 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 84% | 34,026 psi | 71% | 2313 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 92% | 35,360 psi | 74% | 2405 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 29,849 psi | 62% | 2274 fps | 95.8% |
| Shooters World Precision | <<locked>> | 86% | 34,330 psi | 72% | 2343 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 40,030 psi | 84% | 2510 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 37,971 psi | 79% | 2421 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,605 psi | 70% | 2251 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,122 psi | 57% | 2119 fps | 96.6% |
| Somchem S321 | <<locked>> | 80% | 36,419 psi | 76% | 2392 fps | 96.5% |
| Somchem S335 | <<locked>> | 80% | 32,822 psi | 69% | 2254 fps | 98.3% |
| Somchem S341 | <<locked>> | 86% | 38,914 psi | 81% | 2434 fps | 95.2% |
| Somchem S355 | <<locked>> | 92% | 36,825 psi | 77% | 2418 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 38,305 psi | 80% | 2339 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 33,576 psi | 70% | 2264 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 80% | 28,456 psi | 59% | 2221 fps | 98.8% |
| Vihtavuori N140 | <<locked>> | 80% | 29,776 psi | 62% | 2224 fps | 97% |
| Vihtavuori N150 | <<locked>> | 90% | 32,938 psi | 69% | 2313 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 34,156 psi | 71% | 2316 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 28,485 psi | 60% | 2208 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 39,262 psi | 82% | 2434 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 32,735 psi | 68% | 2346 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 36,825 psi | 77% | 2421 fps | 95.5% |
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 83 powders for 8 x 57 IRS loaded with the .323 | 180gr | Hornady GMX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,598 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,598 fps. Accurate 4350 gives the best case fill at 100 %, and 83 of the 83 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.323" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, 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, Hodgdon LEVERevolution, Bofors RP3 rank at the top here: for 8 x 57 IRS with the .323 | 180gr | Hornady GMX they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4350, Alliant Power Pro 2000-MR, Alliant Reloder-16 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.