Load Specifications
Load data in caliber 8 x 57 PCC with .322 | 175gr | Prvi Partizan HP BT bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 57,566 psi | 90% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,840 psi | 88% | 2920 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2884 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 54,230 psi | 85% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,563 psi | 86% | 3005 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 57,101 psi | 89% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,737 psi | 86% | 2940 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3041 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,767 psi | 87% | 2936 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,435 psi | 90% | 2907 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,464 psi | 90% | 3123 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,434 psi | 87% | 2969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,651 psi | 87% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,332 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,797 psi | 89% | 3097 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3028 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,803 psi | 72% | 2910 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,030 psi | 63% | 2802 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 3097 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,261 psi | 90% | 3009 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 56,057 psi | 88% | 2982 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,753 psi | 87% | 2959 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,334 psi | 90% | 2920 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,840 psi | 88% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,768 psi | 89% | 2999 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 57,145 psi | 90% | 3061 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 92% | 57,000 psi | 89% | 3018 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 84% | 57,711 psi | 90% | 3002 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,695 psi | 87% | 2989 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,215 psi | 85% | 2982 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,580 psi | 90% | 3100 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 56% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,332 psi | 87% | 2949 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,810 psi | 86% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,696 psi | 90% | 2976 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,290 psi | 90% | 2959 fps | 98.6% |
| IMR 4350 | <<locked>> | 96% | 56,434 psi | 88% | 2989 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,522 psi | 90% | 2989 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 54,998 psi | 86% | 2995 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 57,116 psi | 90% | 3018 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,767 psi | 87% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,421 psi | 90% | 2966 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,072 psi | 88% | 2913 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,476 psi | 85% | 2923 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,261 psi | 90% | 2982 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 54,984 psi | 86% | 2969 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,364 psi | 63% | 2723 fps | 96% |
| Norma 201 | <<locked>> | 84% | 55,927 psi | 88% | 2936 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,434 psi | 88% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,940 psi | 86% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,348 psi | 90% | 3041 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 51,387 psi | 81% | 3048 fps | 97.8% |
| Norma URP | <<locked>> | 96% | 57,058 psi | 89% | 3048 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,564 psi | 87% | 2999 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,840 psi | 88% | 3045 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 56,028 psi | 88% | 2959 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,086 psi | 88% | 2976 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 57% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,840 psi | 89% | 2979 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,550 psi | 89% | 3058 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,492 psi | 89% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,404 psi | 85% | 3028 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,130 psi | 90% | 3117 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 56,695 psi | 89% | 2913 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,579 psi | 89% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,144 psi | 88% | 2976 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,085 psi | 85% | 3012 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 55,753 psi | 87% | 2959 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,261 psi | 90% | 2982 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,421 psi | 90% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,476 psi | 85% | 2923 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,984 psi | 86% | 2969 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,259 psi | 85% | 2986 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,911 psi | 86% | 2940 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,651 psi | 87% | 2963 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,898 psi | 89% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,609 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,392 psi | 90% | 2936 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 3009 fps | 96.8% |
| Somchem S335 | <<locked>> | 84% | 56,536 psi | 89% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,505 psi | 85% | 2930 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,130 psi | 88% | 2972 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,883 psi | 88% | 3051 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,708 psi | 86% | 2989 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 84% | 57,305 psi | 90% | 2851 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,594 psi | 89% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,217 psi | 90% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,711 psi | 90% | 2949 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,651 psi | 87% | 2989 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 56,275 psi | 88% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,317 psi | 87% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,708 psi | 86% | 2992 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,995 psi | 80% | 2989 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,637 psi | 87% | 2959 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,956 psi | 89% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,377 psi | 90% | 3064 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,249 psi | 65% | 2943 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,651 psi | 87% | 2969 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 2923 fps | 96% |
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 2495 | <<locked>> | 80% | 47,456 psi | 74% | 2762 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,730 psi | 72% | 2743 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 39,494 psi | 62% | 2707 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 44,889 psi | 70% | 2762 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,692 psi | 53% | 2589 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 50,502 psi | 79% | 2884 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,815 psi | 67% | 2726 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 49,095 psi | 77% | 2920 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,547 psi | 82% | 2887 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,853 psi | 84% | 2861 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,659 psi | 73% | 2933 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,931 psi | 67% | 2753 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,050 psi | 72% | 2822 fps | 99.3% |
| Alliant Reloder-16 | 61.6 gr | 80% | 33,344 psi | 52% | 2602 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,536 psi | 59% | 2733 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,312 psi | 76% | 2910 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,283 psi | 46% | 2507 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,681 psi | 59% | 2746 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,274 psi | 57% | 2756 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,067 psi | 78% | 2894 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,960 psi | 67% | 2759 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 43,439 psi | 68% | 2733 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,867 psi | 84% | 2867 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,141 psi | 82% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,526 psi | 68% | 2762 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 40,973 psi | 64% | 2759 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 47,079 psi | 74% | 2841 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 51,010 psi | 80% | 2894 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,806 psi | 48% | 2497 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,398 psi | 74% | 2871 fps | 100% |
| Hodgdon Superformance | 75.4 gr | 86% | 43,149 psi | 68% | 2835 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,847 psi | 42% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,820 psi | 77% | 2844 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 51,155 psi | 80% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,020 psi | 71% | 2762 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,413 psi | 74% | 2789 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 43,918 psi | 69% | 2762 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,279 psi | 66% | 2710 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 32,474 psi | 51% | 2543 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 47,224 psi | 74% | 2854 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 52,547 psi | 82% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,343 psi | 79% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,617 psi | 78% | 2812 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 45,063 psi | 71% | 2762 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 37,202 psi | 58% | 2602 fps | 95.3% |
| Lovex S070 | <<locked>> | 84% | 40,205 psi | 63% | 2687 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 37,811 psi | 59% | 2671 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 49,356 psi | 77% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,763 psi | 78% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,426 psi | 71% | 2808 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,966 psi | 78% | 2917 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 41,858 psi | 66% | 2854 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 33,750 psi | 53% | 2589 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 45,382 psi | 71% | 2825 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 39,972 psi | 63% | 2746 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 52,475 psi | 82% | 2900 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,431 psi | 82% | 2920 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,267 psi | 43% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,743 psi | 69% | 2746 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,226 psi | 77% | 2936 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,929 psi | 63% | 2802 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,315 psi | 52% | 2602 fps | 95% |
| ReloadSwiss RS 70 | 69.1 gr | 82% | 35,244 psi | 55% | 2667 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 53,417 psi | 84% | 2864 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,992 psi | 74% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,538 psi | 64% | 2703 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 47,195 psi | 74% | 2890 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 84% | 43,439 psi | 68% | 2733 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,202 psi | 58% | 2602 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,343 psi | 79% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,063 psi | 71% | 2762 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 40,205 psi | 63% | 2687 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,452 psi | 65% | 2753 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,256 psi | 80% | 2881 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,834 psi | 77% | 2851 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,270 psi | 79% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,250 psi | 66% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,539 psi | 65% | 2654 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,746 psi | 73% | 2884 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 50,067 psi | 78% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,952 psi | 80% | 2871 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 41,060 psi | 64% | 2707 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 30,269 psi | 47% | 2539 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 44,904 psi | 70% | 2812 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 50,749 psi | 80% | 2759 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,847 psi | 73% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,297 psi | 74% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,160 psi | 61% | 2638 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 35,143 psi | 55% | 2592 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 52,692 psi | 83% | 2884 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,571 psi | 71% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,563 psi | 54% | 2589 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 32,097 psi | 50% | 2589 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,592 psi | 54% | 2566 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 53,156 psi | 83% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,973 psi | 64% | 2759 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,544 psi | 46% | 2598 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,704 psi | 76% | 2858 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,008 psi | 75% | 2861 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 116 powders for 8 x 57 PCC loaded with the .322 | 175gr | Prvi Partizan HP BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,123 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.322" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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. Alliant Reloder-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for 8 x 57 PCC with the .322 | 175gr | Prvi Partizan HP BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.