Load Specifications
Load data in caliber 8 x 57 IS with .323 | 160gr | Geco STAR bullet and 76 powders. The key underlying parameters are shown in the table above.
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>> | 90% | 49,879 psi | 88% | 2713 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 50,009 psi | 88% | 2769 fps | 96% |
| Accurate 2230 | <<locked>> | 82% | 50,531 psi | 89% | 2779 fps | 96.6% |
| Accurate 2460 | <<locked>> | 86% | 48,298 psi | 85% | 2720 fps | 99.4% |
| Accurate 2495 | <<locked>> | 96% | 49,487 psi | 87% | 2762 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 48,704 psi | 86% | 2766 fps | 99.3% |
| Accurate 4064 | <<locked>> | 98% | 48,834 psi | 86% | 2785 fps | 99.8% |
| Accurate LT-30 | <<locked>> | 84% | 50,430 psi | 89% | 2657 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 50,807 psi | 90% | 2674 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 92% | 48,530 psi | 86% | 2759 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 98% | 49,110 psi | 87% | 2746 fps | 95.9% |
| ADI AR 2219 | <<locked>> | 84% | 49,719 psi | 88% | 2766 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 92% | 51,155 psi | 90% | 2776 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 92% | 49,313 psi | 87% | 2782 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 48,704 psi | 86% | 2818 fps | 97.5% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 50,647 psi | 90% | 2818 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 86% | 49,995 psi | 88% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 48,849 psi | 86% | 2785 fps | 96.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 45,136 psi | 80% | 2785 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 49,110 psi | 87% | 2654 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 50,778 psi | 90% | 2812 fps | 95.9% |
| Bofors RP3ᴾ | <<locked>> | 100% | 50,676 psi | 90% | 2828 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 90% | 50,676 psi | 90% | 2723 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 92% | 49,110 psi | 87% | 2795 fps | 98.6% |
| Hodgdon CFE223 | <<locked>> | 90% | 50,589 psi | 89% | 2874 fps | 96.5% |
| Hodgdon H322 | <<locked>> | 86% | 48,515 psi | 86% | 2746 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 86% | 49,313 psi | 87% | 2766 fps | 99.6% |
| Hodgdon H4895 | <<locked>> | 92% | 48,892 psi | 86% | 2776 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 49,661 psi | 88% | 2838 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,069 psi | 60% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 50,183 psi | 89% | 2776 fps | 97.5% |
| IMR 3031 | <<locked>> | 94% | 50,125 psi | 89% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 48,733 psi | 86% | 2733 fps | 96.2% |
| IMR 4198 | <<locked>> | 86% | 50,212 psi | 89% | 2687 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 49,980 psi | 88% | 2822 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 92% | 51,155 psi | 90% | 2776 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 86% | 48,051 psi | 85% | 2717 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 94% | 49,719 psi | 88% | 2792 fps | 99.3% |
| Lovex S060 | <<locked>> | 92% | 49,588 psi | 88% | 2703 fps | 96.9% |
| Lovex S062 | <<locked>> | 98% | 50,981 psi | 90% | 2785 fps | 98.4% |
| Norma 200 | <<locked>> | 82% | 50,386 psi | 89% | 2707 fps | 100% |
| Norma 201 | <<locked>> | 94% | 50,560 psi | 89% | 2766 fps | 98.3% |
| Norma 202 | <<locked>> | 94% | 50,401 psi | 89% | 2779 fps | 99.7% |
| Norma 203B | <<locked>> | 98% | 50,865 psi | 90% | 2825 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 96% | 48,095 psi | 85% | 2789 fps | 96.3% |
| Ramshot Wild Boar | <<locked>> | 92% | 50,299 psi | 89% | 2795 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 88% | 49,603 psi | 88% | 2726 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,461 psi | 61% | 1739 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 51,097 psi | 90% | 2776 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 50,923 psi | 90% | 2890 fps | 96.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 48,138 psi | 85% | 2864 fps | 99% |
| Rottweil R 901 | <<locked>> | 90% | 49,255 psi | 87% | 2723 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 96% | 51,024 psi | 90% | 2762 fps | 98.3% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 47,340 psi | 84% | 2762 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 94% | 49,719 psi | 88% | 2792 fps | 99.3% |
| Shooters World Precision | <<locked>> | 98% | 50,981 psi | 90% | 2785 fps | 98.4% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 47,877 psi | 85% | 2680 fps | 97.4% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 50,328 psi | 89% | 2776 fps | 99.7% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 49,342 psi | 87% | 2818 fps | 96.6% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 50,488 psi | 89% | 2740 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 49,734 psi | 88% | 2776 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 49,806 psi | 88% | 2684 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 48,689 psi | 86% | 2674 fps | 99.9% |
| Somchem S321 | <<locked>> | 88% | 48,892 psi | 86% | 2762 fps | 98.3% |
| Somchem S335 | <<locked>> | 92% | 48,921 psi | 86% | 2684 fps | 99.9% |
| Somchem S341 | <<locked>> | 92% | 48,443 psi | 86% | 2740 fps | 96.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 48,327 psi | 85% | 2766 fps | 97.2% |
| Vihtavuori N130 | <<locked>> | 88% | 49,821 psi | 88% | 2671 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 49,400 psi | 87% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 48,820 psi | 86% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 50,647 psi | 90% | 2756 fps | 99.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 46,557 psi | 82% | 2707 fps | 98.1% |
| Vihtavuori N530 | <<locked>> | 90% | 48,312 psi | 85% | 2723 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 96% | 49,168 psi | 87% | 2753 fps | 99.5% |
| Winchester 748 | <<locked>> | 92% | 49,690 psi | 88% | 2815 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 94% | 48,965 psi | 87% | 2782 fps | 97.4% |
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 36,912 psi | 65% | 2480 fps | 99.5% |
| Accurate 2200 | <<locked>> | 80% | 46,804 psi | 83% | 2713 fps | 95.2% |
| Accurate 2230 | <<locked>> | 80% | 47,007 psi | 83% | 2720 fps | 95.7% |
| Accurate 2460 | <<locked>> | 80% | 39,856 psi | 70% | 2566 fps | 98.1% |
| Accurate 2495 | <<locked>> | 80% | 30,052 psi | 53% | 2382 fps | 98.4% |
| Accurate 2520 | <<locked>> | 80% | 35,012 psi | 62% | 2500 fps | 96.4% |
| Accurate 4064 | <<locked>> | 80% | 28,398 psi | 50% | 2349 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 44,904 psi | 79% | 2569 fps | 99.7% |
| Accurate LT-32 | <<locked>> | 80% | 45,208 psi | 80% | 2579 fps | 98.7% |
| ADI AR 2206H | <<locked>> | 88% | 43,047 psi | 76% | 2657 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 96% | 46,354 psi | 82% | 2697 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 43,526 psi | 77% | 2661 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 37,753 psi | 67% | 2523 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 33,881 psi | 60% | 2500 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 40,422 psi | 71% | 2657 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 39,755 psi | 70% | 2618 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 41,829 psi | 74% | 2589 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 45,847 psi | 81% | 2733 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 42,366 psi | 75% | 2726 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 43,569 psi | 77% | 2559 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 47,500 psi | 84% | 2753 fps | 95.1% |
| Bofors RP3 | <<locked>> | 92% | 39,334 psi | 70% | 2621 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 37,855 psi | 67% | 2480 fps | 95.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 35,389 psi | 63% | 2530 fps | 95.2% |
| Hodgdon CFE223 | <<locked>> | 88% | 47,253 psi | 84% | 2815 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 39,943 psi | 71% | 2592 fps | 99.1% |
| Hodgdon H335 | <<locked>> | 80% | 40,495 psi | 72% | 2605 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 86% | 40,669 psi | 72% | 2615 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 38,725 psi | 68% | 2621 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,469 psi | 45% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 41,727 psi | 74% | 2621 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 32,314 psi | 57% | 2477 fps | 98.1% |
| IMR 4064 | <<locked>> | 94% | 45,992 psi | 81% | 2684 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 42,351 psi | 75% | 2562 fps | 100% |
| IMR 4895 | <<locked>> | 90% | 41,524 psi | 73% | 2664 fps | 95% |
| IMR 8208 XBR | <<locked>> | 82% | 37,753 psi | 67% | 2523 fps | 95.2% |
| Lovex D073.5 | <<locked>> | 80% | 39,465 psi | 70% | 2559 fps | 96.8% |
| Lovex D073.6 | <<locked>> | 80% | 31,604 psi | 56% | 2431 fps | 95.1% |
| Lovex S060 | <<locked>> | 88% | 44,077 psi | 78% | 2602 fps | 95.6% |
| Lovex S062 | <<locked>> | 88% | 37,985 psi | 67% | 2543 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 47,282 psi | 84% | 2657 fps | 100% |
| Norma 201 | <<locked>> | 84% | 37,739 psi | 67% | 2520 fps | 95.3% |
| Norma 202 | <<locked>> | 80% | 33,083 psi | 58% | 2441 fps | 96.5% |
| Norma 203B | <<locked>> | 92% | 42,511 psi | 75% | 2674 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 94% | 44,976 psi | 80% | 2733 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 44,092 psi | 78% | 2687 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 43,700 psi | 77% | 2618 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,469 psi | 45% | 1552 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 39,856 psi | 70% | 2569 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 44,657 psi | 79% | 2776 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 35,288 psi | 62% | 2572 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 37,362 psi | 66% | 2493 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 86% | 38,072 psi | 67% | 2520 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 94% | 39,262 psi | 69% | 2612 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,604 psi | 56% | 2431 fps | 95.1% |
| Shooters World Precision | <<locked>> | 88% | 37,985 psi | 67% | 2543 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,047 psi | 74% | 2575 fps | 96% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 44,121 psi | 78% | 2667 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 43,540 psi | 77% | 2710 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,105 psi | 74% | 2595 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 44,092 psi | 78% | 2674 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,099 psi | 62% | 2405 fps | 97% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,674 psi | 51% | 2267 fps | 96% |
| Somchem S321 | <<locked>> | 80% | 37,869 psi | 67% | 2546 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 34,490 psi | 61% | 2408 fps | 97.8% |
| Somchem S341 | <<locked>> | 88% | 42,757 psi | 76% | 2635 fps | 95% |
| Somchem S355 | <<locked>> | 94% | 40,422 psi | 71% | 2618 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 39,711 psi | 70% | 2500 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 34,853 psi | 62% | 2415 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 80% | 30,153 psi | 53% | 2382 fps | 98.4% |
| Vihtavuori N140 | <<locked>> | 80% | 31,198 psi | 55% | 2375 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 92% | 36,332 psi | 64% | 2510 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 82% | 37,695 psi | 67% | 2520 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 30,066 psi | 53% | 2359 fps | 95.1% |
| Winchester 748 | <<locked>> | 82% | 36,143 psi | 64% | 2546 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 40,495 psi | 72% | 2625 fps | 95.2% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 94 powders for 8 x 57 IS loaded with the .323 | 160gr | Geco STAR. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,890 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,890 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (390 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.323" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder- TS 15.5, Alliant Reloder-16 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. As outliers, Accurate 4350, Alliant Reloder-16, Hodgdon H380 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.