Load Specifications
Load data in caliber 8 x 57 IS with .323 | 124gr | Prvi Partizan FMJ BT bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H335, 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>> | 84% | 50,981 psi | 90% | 3031 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 48,559 psi | 86% | 3071 fps | 99.7% |
| Accurate 2460 | <<locked>> | 94% | 50,575 psi | 89% | 3123 fps | 98.1% |
| Accurate 2495ᴾ | <<locked>> | 100% | 43,105 psi | 76% | 3038 fps | 99.3% |
| Accurate 2520 | <<locked>> | 98% | 51,097 psi | 90% | 3173 fps | 97.8% |
| Accurate 4064ᴾ | <<locked>> | 100% | 40,030 psi | 71% | 2989 fps | 96.6% |
| Accurate LT-30 | <<locked>> | 88% | 48,733 psi | 86% | 2992 fps | 98.9% |
| Accurate LT-32 | <<locked>> | 88% | 49,139 psi | 87% | 3002 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 86% | 48,602 psi | 86% | 3048 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 49,835 psi | 88% | 3146 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 98% | 50,894 psi | 90% | 3130 fps | 95.9% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 51,184 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 92% | 49,037 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 86% | 49,966 psi | 88% | 3054 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 50,343 psi | 89% | 3028 fps | 99.3% |
| Hodgdon Benchmark | <<locked>> | 96% | 50,923 psi | 90% | 3084 fps | 96.6% |
| Hodgdon BL-C2 | <<locked>> | 98% | 48,544 psi | 86% | 3146 fps | 96.1% |
| Hodgdon H322 | <<locked>> | 92% | 48,370 psi | 86% | 3120 fps | 98.8% |
| Hodgdon H335 | <<locked>> | 92% | 49,472 psi | 87% | 3136 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 86% | 50,430 psi | 89% | 3045 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,460 psi | 57% | 1936 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 48,660 psi | 86% | 3192 fps | 99.4% |
| IMR 4198 | <<locked>> | 92% | 50,372 psi | 89% | 3081 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 50,401 psi | 89% | 3012 fps | 100% |
| IMR 8208 XBR | <<locked>> | 98% | 50,894 psi | 90% | 3130 fps | 95.9% |
| Lovex D073.4 | <<locked>> | 86% | 47,718 psi | 84% | 3084 fps | 96.9% |
| Lovex D073.5 | <<locked>> | 94% | 50,778 psi | 90% | 3123 fps | 96.9% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 48,196 psi | 85% | 3133 fps | 97.3% |
| Lovex S053 | <<locked>> | 82% | 49,385 psi | 87% | 2963 fps | 100% |
| Norma 200 | <<locked>> | 88% | 49,197 psi | 87% | 3084 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 49,588 psi | 88% | 3107 fps | 95.7% |
| Norma 202ᴾ | <<locked>> | 100% | 49,414 psi | 87% | 3133 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,227 psi | 57% | 1975 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 50,343 psi | 89% | 3048 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 94% | 51,097 psi | 90% | 3140 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 98% | 50,676 psi | 90% | 3123 fps | 98.1% |
| Shooters World AR Plus | <<locked>> | 86% | 47,718 psi | 84% | 3084 fps | 96.9% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 48,196 psi | 85% | 3133 fps | 97.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 50,154 psi | 89% | 2808 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 90% | 50,502 psi | 89% | 3146 fps | 98.2% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 49,995 psi | 88% | 3114 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 50,009 psi | 88% | 3041 fps | 98.1% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 42,569 psi | 75% | 2917 fps | 97.7% |
| Somchem S321 | <<locked>> | 94% | 48,863 psi | 86% | 3114 fps | 95.8% |
| Somchem S335 | <<locked>> | 98% | 48,443 psi | 86% | 3038 fps | 98.6% |
| Vihtavuori N120 | <<locked>> | 86% | 48,646 psi | 86% | 3002 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 49,850 psi | 88% | 3048 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 49,211 psi | 87% | 3048 fps | 99.7% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 44,092 psi | 78% | 3045 fps | 99.4% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 46,789 psi | 83% | 3054 fps | 98% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 45,498 psi | 80% | 3041 fps | 97.2% |
| Winchester 748 | <<locked>> | 98% | 49,617 psi | 88% | 3173 fps | 96.7% |
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% | 44,715 psi | 79% | 2920 fps | 99.7% |
| Accurate 2015 | <<locked>> | 80% | 29,225 psi | 52% | 2631 fps | 95.1% |
| Accurate 2460 | <<locked>> | 86% | 38,580 psi | 68% | 2887 fps | 95.2% |
| Accurate 2495 | <<locked>> | 88% | 28,645 psi | 51% | 2690 fps | 95.4% |
| Accurate 2520 | 53.8 gr | 92% | 41,307 psi | 73% | 2986 fps | 95.6% |
| Accurate 4064 | <<locked>> | 96% | 35,244 psi | 62% | 2877 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 38,029 psi | 67% | 2772 fps | 96.7% |
| Accurate LT-32 | <<locked>> | 82% | 40,915 psi | 72% | 2835 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 40,277 psi | 71% | 2897 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 35,549 psi | 63% | 2838 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 96% | 47,834 psi | 85% | 3071 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 26,861 psi | 47% | 2641 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,881 psi | 60% | 2779 fps | 98% |
| Alliant Reloder-7 | <<locked>> | 80% | 41,524 psi | 73% | 2897 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,361 psi | 64% | 2749 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 92% | 45,078 psi | 80% | 2972 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 96% | 45,165 psi | 80% | 3081 fps | 95.3% |
| Hodgdon H322 | 45.4 gr | 82% | 34,708 psi | 61% | 2818 fps | 95.2% |
| Hodgdon H335 | 49.8 gr | 84% | 37,724 psi | 67% | 2890 fps | 95.2% |
| Hodgdon H4198 | <<locked>> | 80% | 41,901 psi | 74% | 2877 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,772 psi | 42% | 1729 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 33,199 psi | 59% | 2838 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 35,476 psi | 63% | 2779 fps | 99.1% |
| IMR 4227 | <<locked>> | 80% | 47,500 psi | 84% | 2963 fps | 100% |
| IMR 8208 XBR | <<locked>> | 96% | 47,834 psi | 85% | 3071 fps | 95.1% |
| Lovex D073.4 | <<locked>> | 82% | 41,292 psi | 73% | 2953 fps | 95.2% |
| Lovex D073.5 | <<locked>> | 90% | 44,077 psi | 78% | 2999 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 96% | 42,192 psi | 75% | 3015 fps | 95.8% |
| Lovex S053 | <<locked>> | 80% | 46,557 psi | 82% | 2913 fps | 100% |
| Norma 200 | <<locked>> | 80% | 38,305 psi | 68% | 2867 fps | 99.4% |
| Norma 201 | <<locked>> | 98% | 46,775 psi | 83% | 3054 fps | 95% |
| Norma 202 | <<locked>> | 92% | 38,392 psi | 68% | 2910 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,714 psi | 42% | 1768 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 47,500 psi | 84% | 2999 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 42,235 psi | 75% | 2966 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 90% | 39,914 psi | 71% | 2904 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 82% | 41,292 psi | 73% | 2953 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 96% | 42,192 psi | 75% | 3015 fps | 95.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 42,830 psi | 76% | 2694 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 38,609 psi | 68% | 2904 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,142 psi | 60% | 2776 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 38,957 psi | 69% | 2825 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 35,447 psi | 63% | 2759 fps | 95.6% |
| Somchem S321 | <<locked>> | 92% | 45,585 psi | 81% | 3051 fps | 95% |
| Somchem S335 | <<locked>> | 88% | 35,520 psi | 63% | 2766 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 40,422 psi | 71% | 2854 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 32,358 psi | 57% | 2680 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 82% | 29,994 psi | 53% | 2625 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 88% | 30,023 psi | 53% | 2713 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 92% | 36,390 psi | 64% | 2835 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 96% | 39,885 psi | 71% | 2927 fps | 95.7% |
| Winchester 748 | <<locked>> | 94% | 43,468 psi | 77% | 3048 fps | 95% |
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 IS loaded with the .323 | 124gr | Prvi Partizan FMJ BT. Alliant Power Pro 1200-R delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,238 fps. Accurate 2495 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 (390 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. Accurate 2495, Accurate 4064, Alliant AR-Comp 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. Hodgdon H335, Accurate 2520, Hodgdon H322 rank at the top here: for 8 x 57 IS with the .323 | 124gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2200, Accurate 2230, ADI AR 2206H 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.