Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 185gr | Prvi Partizan Grom bullet and 59 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 Hodgdon LEVERevolution.
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>> | 82% | 41,278 psi | 86% | 2402 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 40,814 psi | 85% | 2454 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 41,263 psi | 86% | 2484 fps | 99.3% |
| Accurate 2520 | <<locked>> | 84% | 41,263 psi | 86% | 2484 fps | 99.3% |
| Accurate 4064 | <<locked>> | 90% | 40,814 psi | 85% | 2484 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 43,047 psi | 90% | 2500 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 90% | 41,350 psi | 86% | 2451 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 84% | 42,772 psi | 89% | 2470 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 84% | 41,249 psi | 86% | 2470 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 42,888 psi | 90% | 2520 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 88% | 41,017 psi | 86% | 2484 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 42,656 psi | 89% | 2592 fps | 97.5% |
| Bofors RP3 | <<locked>> | 92% | 42,366 psi | 89% | 2523 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 42,438 psi | 89% | 2421 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 84% | 40,480 psi | 85% | 2480 fps | 98.4% |
| Hodgdon CFE223 | <<locked>> | 82% | 41,727 psi | 87% | 2549 fps | 96.3% |
| Hodgdon H322 | <<locked>> | 82% | 42,192 psi | 88% | 2467 fps | 100% |
| Hodgdon H4895 | <<locked>> | 86% | 43,308 psi | 90% | 2513 fps | 97.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,580 psi | 81% | 2448 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 41,423 psi | 87% | 2530 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,360 psi | 72% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 41,220 psi | 86% | 2457 fps | 97.3% |
| IMR 3031 | <<locked>> | 88% | 40,756 psi | 85% | 2493 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 42,902 psi | 90% | 2470 fps | 96.7% |
| IMR 4895 | <<locked>> | 88% | 41,901 psi | 88% | 2513 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 84% | 42,772 psi | 89% | 2470 fps | 98.3% |
| Lovex D073.6 | <<locked>> | 86% | 41,263 psi | 86% | 2484 fps | 99.3% |
| Lovex S060 | <<locked>> | 84% | 41,510 psi | 87% | 2402 fps | 96.8% |
| Lovex S062 | <<locked>> | 90% | 42,772 psi | 89% | 2484 fps | 98.4% |
| Norma 201 | <<locked>> | 86% | 42,090 psi | 88% | 2457 fps | 98.2% |
| Norma 202 | <<locked>> | 86% | 42,235 psi | 88% | 2474 fps | 99.7% |
| Norma 203B | <<locked>> | 90% | 42,714 psi | 89% | 2520 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 90% | 42,627 psi | 89% | 2533 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 41,640 psi | 87% | 2484 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,490 psi | 72% | 1621 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 42,583 psi | 89% | 2575 fps | 96.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 42,699 psi | 89% | 2608 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 41,104 psi | 86% | 2418 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 88% | 42,525 psi | 89% | 2457 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 94% | 42,264 psi | 88% | 2513 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 41,263 psi | 86% | 2484 fps | 99.3% |
| Shooters World Precision | <<locked>> | 90% | 42,772 psi | 89% | 2484 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 41,220 psi | 86% | 2513 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 41,568 psi | 87% | 2470 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 41,684 psi | 87% | 2385 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 40,799 psi | 85% | 2382 fps | 99.9% |
| Somchem S321 | <<locked>> | 82% | 42,902 psi | 90% | 2493 fps | 98.6% |
| Somchem S335 | <<locked>> | 84% | 40,872 psi | 85% | 2388 fps | 99.8% |
| Somchem S341 | <<locked>> | 86% | 42,772 psi | 89% | 2484 fps | 97% |
| Somchem S355 | <<locked>> | 94% | 43,236 psi | 90% | 2516 fps | 97.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,550 psi | 78% | 2497 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 84% | 41,669 psi | 87% | 2388 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 41,365 psi | 86% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 42,612 psi | 89% | 2461 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 94% | 41,626 psi | 87% | 2461 fps | 98.6% |
| Vihtavuori N530 | <<locked>> | 84% | 42,554 psi | 89% | 2461 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 88% | 41,031 psi | 86% | 2448 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 43,033 psi | 90% | 2493 fps | 97.5% |
| Winchester 748 | <<locked>> | 82% | 41,785 psi | 87% | 2510 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 2015 | <<locked>> | 80% | 38,783 psi | 81% | 2359 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 31,415 psi | 66% | 2270 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 35,752 psi | 75% | 2375 fps | 98.3% |
| Accurate 2520 | <<locked>> | 80% | 35,752 psi | 75% | 2375 fps | 98.3% |
| Accurate 4064 | <<locked>> | 80% | 29,718 psi | 62% | 2247 fps | 97.6% |
| ADI AR 2206H | <<locked>> | 80% | 35,723 psi | 75% | 2352 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 88% | 38,928 psi | 81% | 2402 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,710 psi | 79% | 2372 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 80% | 36,143 psi | 76% | 2382 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 33,054 psi | 69% | 2320 fps | 95.3% |
| Alliant Reloder-15 | <<locked>> | 86% | 38,377 psi | 80% | 2431 fps | 95.3% |
| Alliant Reloder-17 | 50.6 gr | 92% | 37,434 psi | 78% | 2480 fps | 95.8% |
| Bofors RP3 | <<locked>> | 84% | 32,314 psi | 68% | 2316 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,740 psi | 83% | 2372 fps | 98.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,389 psi | 74% | 2379 fps | 97.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 38,812 psi | 81% | 2490 fps | 95.4% |
| Hodgdon H322 | <<locked>> | 80% | 39,595 psi | 83% | 2421 fps | 99.8% |
| Hodgdon H4895 | <<locked>> | 80% | 35,955 psi | 75% | 2365 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 36,303 psi | 76% | 2402 fps | 95.5% |
| Hodgdon LEVERevolution | 45 gr | 84% | 34,258 psi | 72% | 2375 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,338 psi | 53% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 34,142 psi | 71% | 2310 fps | 95.1% |
| IMR 3031 | <<locked>> | 80% | 31,604 psi | 66% | 2310 fps | 99.2% |
| IMR 4064 | <<locked>> | 88% | 38,000 psi | 79% | 2379 fps | 95.2% |
| IMR 4895 | <<locked>> | 84% | 36,883 psi | 77% | 2411 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 37,710 psi | 79% | 2372 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 80% | 33,562 psi | 70% | 2329 fps | 97.7% |
| Lovex S060 | <<locked>> | 80% | 36,637 psi | 77% | 2306 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 31,430 psi | 66% | 2247 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 35,085 psi | 73% | 2316 fps | 96.4% |
| Norma 202 | <<locked>> | 80% | 34,925 psi | 73% | 2333 fps | 98.6% |
| Norma 203B | <<locked>> | 84% | 35,447 psi | 74% | 2372 fps | 95% |
| Ramshot Big Game | <<locked>> | 86% | 37,420 psi | 78% | 2431 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,303 psi | 76% | 2375 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,570 psi | 53% | 1447 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 39,755 psi | 83% | 2523 fps | 95.7% |
| ReloadSwiss RS 60 | 46.2 gr | 84% | 30,893 psi | 65% | 2329 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 38,711 psi | 81% | 2372 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 80% | 33,402 psi | 70% | 2274 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 88% | 34,766 psi | 73% | 2365 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,562 psi | 70% | 2329 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 31,430 psi | 66% | 2247 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 36,434 psi | 76% | 2415 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 36,477 psi | 76% | 2369 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,811 psi | 77% | 2297 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,037 psi | 63% | 2169 fps | 98.2% |
| Somchem S321 | <<locked>> | 80% | 40,219 psi | 84% | 2444 fps | 98% |
| Somchem S335 | <<locked>> | 80% | 36,303 psi | 76% | 2300 fps | 99.3% |
| Somchem S341 | <<locked>> | 82% | 37,492 psi | 78% | 2382 fps | 95.5% |
| Somchem S355 | <<locked>> | 86% | 33,721 psi | 70% | 2323 fps | 95% |
| Somchem S365 | <<locked>> | 96% | 33,127 psi | 69% | 2392 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 80% | 36,825 psi | 77% | 2300 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,981 psi | 67% | 2274 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 80% | 32,924 psi | 69% | 2274 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 84% | 30,110 psi | 63% | 2224 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 37,362 psi | 78% | 2362 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 80% | 31,691 psi | 66% | 2257 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 35,375 psi | 74% | 2339 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 39,073 psi | 82% | 2457 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 59 powders for 8 x 57 IRS loaded with the .323 | 185gr | Prvi Partizan Grom. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,608 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,608 fps. Hodgdon Hybrid 100V gives the best case fill at 100 %, and 59 of the 59 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 185.0 gr projectile in 0.323" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Hodgdon Hybrid 100V, 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, Hodgdon LEVERevolution rank at the top here: for 8 x 57 IRS with the .323 | 185gr | Prvi Partizan Grom 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.