Load Specifications
Load data in caliber 8 x 57 IS with .323 | 138.9gr | Sax KJG-SR bullet and 56 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester 748, Accurate 2520 and Hodgdon H322.
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 1680 | <<locked>> | 82% | 48,515 psi | 86% | 2825 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 49,443 psi | 87% | 2923 fps | 100% |
| Accurate 2460 | <<locked>> | 92% | 48,254 psi | 85% | 2927 fps | 98.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 43,830 psi | 77% | 2894 fps | 99.8% |
| Accurate 2520 | <<locked>> | 96% | 48,631 psi | 86% | 2972 fps | 98.2% |
| Accurate 4064ᴾ | <<locked>> | 100% | 40,741 psi | 72% | 2854 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 88% | 49,690 psi | 88% | 2848 fps | 99.5% |
| Accurate LT-32 | <<locked>> | 88% | 50,125 psi | 89% | 2861 fps | 98.4% |
| ADI AR 2207 | <<locked>> | 86% | 49,588 psi | 88% | 2890 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 51,111 psi | 90% | 3002 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 96% | 48,762 psi | 86% | 2936 fps | 96.5% |
| Alliant AR-Comp | <<locked>> | 98% | 49,226 psi | 87% | 3005 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 49,066 psi | 87% | 3035 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 92% | 50,227 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 86% | 50,763 psi | 90% | 2900 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 47,979 psi | 85% | 2831 fps | 99.5% |
| Hodgdon Benchmark | <<locked>> | 94% | 48,820 psi | 86% | 2890 fps | 97.1% |
| Hodgdon BL-C2 | <<locked>> | 98% | 49,676 psi | 88% | 3009 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 92% | 49,516 psi | 88% | 2976 fps | 99.4% |
| Hodgdon H335 | <<locked>> | 92% | 50,763 psi | 90% | 2995 fps | 99% |
| Hodgdon H4198 | <<locked>> | 84% | 48,327 psi | 85% | 2844 fps | 99% |
| Hodgdon H4895 | <<locked>> | 98% | 49,168 psi | 87% | 2979 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,489 psi | 57% | 1814 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 49,966 psi | 88% | 3045 fps | 99.9% |
| IMR 4198 | <<locked>> | 90% | 48,602 psi | 86% | 2881 fps | 100% |
| IMR 8208 XBR | <<locked>> | 96% | 48,762 psi | 86% | 2936 fps | 96.5% |
| Lovex D073.4 | <<locked>> | 86% | 48,646 psi | 86% | 2940 fps | 98% |
| Lovex D073.5 | <<locked>> | 92% | 48,298 psi | 85% | 2927 fps | 97.4% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 49,588 psi | 88% | 2999 fps | 98.4% |
| Lovex S053 | <<locked>> | 82% | 50,096 psi | 89% | 2799 fps | 100% |
| Norma 200 | <<locked>> | 88% | 50,111 psi | 89% | 2930 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 50,531 psi | 89% | 2969 fps | 97% |
| Norma 202ᴾ | <<locked>> | 100% | 50,705 psi | 90% | 2992 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,271 psi | 57% | 1850 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 49,066 psi | 87% | 2943 fps | 97.9% |
| Rottweil R 901 | <<locked>> | 96% | 48,370 psi | 86% | 2923 fps | 98.5% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 47,718 psi | 84% | 2907 fps | 96.3% |
| Shooters World AR Plus | <<locked>> | 86% | 48,646 psi | 86% | 2940 fps | 98% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 49,588 psi | 88% | 2999 fps | 98.4% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 49,748 psi | 88% | 2907 fps | 96.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 50,879 psi | 90% | 2648 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 48,283 psi | 85% | 2946 fps | 98.6% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 48,327 psi | 85% | 2917 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 50,995 psi | 90% | 2900 fps | 98.9% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 43,584 psi | 77% | 2785 fps | 98.6% |
| Somchem S321 | <<locked>> | 94% | 49,879 psi | 88% | 2979 fps | 97.1% |
| Somchem S335 | <<locked>> | 98% | 49,313 psi | 87% | 2894 fps | 99.3% |
| Vihtavuori N120 | <<locked>> | 86% | 49,690 psi | 88% | 2844 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 50,908 psi | 90% | 2900 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 50,314 psi | 89% | 2904 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 45,310 psi | 80% | 2907 fps | 99.9% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 48,051 psi | 85% | 2920 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 96% | 49,400 psi | 87% | 2936 fps | 96.7% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 46,325 psi | 82% | 2904 fps | 98.2% |
| Winchester 748 | <<locked>> | 98% | 50,647 psi | 90% | 3031 fps | 97.8% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 49,763 psi | 88% | 2989 fps | 95.9% |
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 1680 | <<locked>> | 80% | 45,382 psi | 80% | 2772 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 29,530 psi | 52% | 2507 fps | 96.5% |
| Accurate 2460 | <<locked>> | 84% | 36,361 psi | 64% | 2690 fps | 95.6% |
| Accurate 2495 | <<locked>> | 86% | 26,789 psi | 47% | 2500 fps | 95.8% |
| Accurate 2520 | 49.2 gr | 88% | 36,448 psi | 64% | 2733 fps | 95.2% |
| Accurate 4064 | <<locked>> | 94% | 33,315 psi | 59% | 2687 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 38,725 psi | 68% | 2641 fps | 97.8% |
| Accurate LT-32 | <<locked>> | 80% | 39,088 psi | 69% | 2648 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 80% | 40,988 psi | 72% | 2746 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 36,071 psi | 64% | 2707 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 92% | 42,960 psi | 76% | 2825 fps | 95% |
| Alliant AR-Comp | <<locked>> | 80% | 27,195 psi | 48% | 2520 fps | 98.1% |
| Alliant Power Pro 1200-R | <<locked>> | 90% | 46,064 psi | 81% | 2979 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 34,113 psi | 60% | 2638 fps | 98.8% |
| Alliant Reloder-7 | <<locked>> | 80% | 42,221 psi | 75% | 2753 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 37,028 psi | 65% | 2621 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 40,654 psi | 72% | 2730 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 94% | 42,989 psi | 76% | 2887 fps | 95.8% |
| Hodgdon H322 | 42.4 gr | 80% | 33,011 psi | 58% | 2628 fps | 95.8% |
| Hodgdon H335 | <<locked>> | 82% | 35,737 psi | 63% | 2697 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 80% | 42,743 psi | 76% | 2740 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 96% | 45,934 psi | 81% | 2920 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,815 psi | 42% | 1617 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 29,588 psi | 52% | 2595 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 36,114 psi | 64% | 2641 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 92% | 42,960 psi | 76% | 2825 fps | 95% |
| Lovex D073.4 | <<locked>> | 80% | 39,146 psi | 69% | 2756 fps | 95.7% |
| Lovex D073.5 | <<locked>> | 86% | 39,001 psi | 69% | 2746 fps | 95% |
| Lovex D073.6 | <<locked>> | 92% | 37,289 psi | 66% | 2762 fps | 95.5% |
| Lovex S053 | <<locked>> | 80% | 47,340 psi | 84% | 2756 fps | 100% |
| Norma 200 | <<locked>> | 80% | 38,566 psi | 68% | 2720 fps | 99.8% |
| Norma 201 | <<locked>> | 96% | 44,382 psi | 78% | 2854 fps | 95.5% |
| Norma 202 | <<locked>> | 88% | 34,214 psi | 60% | 2661 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,743 psi | 42% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 37,507 psi | 66% | 2710 fps | 95% |
| Rottweil R 901 | <<locked>> | 86% | 35,476 psi | 63% | 2654 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 98% | 44,541 psi | 79% | 2851 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 39,146 psi | 69% | 2756 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 92% | 37,289 psi | 66% | 2762 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 46,195 psi | 82% | 2841 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 43,337 psi | 77% | 2539 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 36,709 psi | 65% | 2713 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,795 psi | 62% | 2644 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 34,679 psi | 61% | 2582 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 31,807 psi | 56% | 2533 fps | 95.4% |
| Somchem S321 | <<locked>> | 90% | 43,395 psi | 77% | 2858 fps | 95.5% |
| Somchem S335 | <<locked>> | 84% | 31,749 psi | 56% | 2533 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 41,104 psi | 73% | 2703 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 32,764 psi | 58% | 2549 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 80% | 28,442 psi | 50% | 2444 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 84% | 26,745 psi | 47% | 2480 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 90% | 34,577 psi | 61% | 2648 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 92% | 42,989 psi | 76% | 2818 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 92% | 35,607 psi | 63% | 2684 fps | 95.4% |
| Winchester 748 | 51.1 gr | 92% | 41,365 psi | 73% | 2854 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 98% | 46,499 psi | 82% | 2930 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 87 powders for 8 x 57 IS loaded with the .323 | 138.9gr | Sax KJG-SR. IMR 3031 delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,045 fps. Accurate 2495 gives the best case fill at 100 %, and 87 of the 87 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (390 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 138.9 gr projectile in 0.323" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, ADI AR 2208 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. Winchester 748, Accurate 2520, Hodgdon H322 rank at the top here: for 8 x 57 IS with the .323 | 138.9gr | Sax KJG-SR they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2200, Accurate 2230, ADI AR 2208 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.