Load Specifications
Load data in caliber 8 x 57 PCC with .323 | 220gr | Sierra GameKing bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand and Norma MRP.
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>> | 82% | 57,624 psi | 90% | 2582 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,028 psi | 88% | 2621 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 2713 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 54,563 psi | 86% | 2592 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,172 psi | 86% | 2700 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2802 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 86% | 57,595 psi | 90% | 2667 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,883 psi | 88% | 2746 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 2802 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,956 psi | 58% | 2480 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,319 psi | 90% | 2789 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,245 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,317 psi | 87% | 2664 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,898 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,435 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,259 psi | 87% | 2736 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2795 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 2720 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2664 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,624 psi | 90% | 2861 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 2723 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 56,086 psi | 88% | 2661 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2795 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 55,245 psi | 87% | 2651 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,333 psi | 88% | 2680 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,708 psi | 86% | 2717 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 55,361 psi | 87% | 2690 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 2677 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,173 psi | 88% | 2726 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,202 psi | 88% | 2677 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,230 psi | 85% | 2661 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,455 psi | 71% | 2707 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 90% | 57,682 psi | 90% | 2792 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 58% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,334 psi | 90% | 2661 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,913 psi | 89% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,550 psi | 89% | 2644 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,376 psi | 87% | 2631 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 56,420 psi | 88% | 2687 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,753 psi | 89% | 2677 fps | 99.7% |
| IMR 4831 | <<locked>> | 96% | 56,594 psi | 89% | 2707 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,739 psi | 89% | 2690 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,216 psi | 87% | 2677 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 98% | 55,259 psi | 87% | 2782 fps | 98.1% |
| Lovex S062 | <<locked>> | 84% | 57,464 psi | 90% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,159 psi | 90% | 2674 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,984 psi | 86% | 2667 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,398 psi | 74% | 2575 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 54,607 psi | 86% | 2651 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,232 psi | 90% | 2740 fps | 99% |
| Norma MRP | <<locked>> | 98% | 56,246 psi | 88% | 2822 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 57,508 psi | 90% | 2736 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,259 psi | 87% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,824 psi | 86% | 2789 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 56,202 psi | 88% | 2743 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2769 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,275 psi | 58% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,217 psi | 88% | 2667 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,855 psi | 89% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,114 psi | 86% | 2726 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,072 psi | 89% | 2802 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,339 psi | 71% | 2700 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 55,927 psi | 88% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,173 psi | 88% | 2657 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,609 psi | 90% | 2717 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 54,708 psi | 86% | 2723 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 55,245 psi | 87% | 2651 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,159 psi | 90% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,464 psi | 90% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,984 psi | 86% | 2667 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,667 psi | 90% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,826 psi | 89% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,681 psi | 89% | 2631 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,244 psi | 85% | 2720 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 56,014 psi | 88% | 2651 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,840 psi | 88% | 2664 fps | 97.3% |
| Somchem S365 | <<locked>> | 94% | 57,145 psi | 90% | 2736 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,245 psi | 87% | 2700 fps | 99.4% |
| Unknown powder | <<locked>> | 88% | 54,331 psi | 85% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,536 psi | 89% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,391 psi | 88% | 2582 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,305 psi | 90% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,854 psi | 88% | 2680 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 2680 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 54,505 psi | 85% | 2579 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,998 psi | 86% | 2684 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,028 psi | 88% | 2746 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,449 psi | 88% | 2815 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,211 psi | 76% | 2671 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,434 psi | 87% | 2648 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,708 psi | 86% | 2717 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2789 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,319 psi | 90% | 2723 fps | 99.1% |
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% | 54,012 psi | 85% | 2536 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,151 psi | 72% | 2467 fps | 98% |
| Accurate 3100 | <<locked>> | 82% | 30,995 psi | 49% | 2251 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,242 psi | 80% | 2546 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,349 psi | 62% | 2441 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 98% | 52,069 psi | 82% | 2743 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 47,950 psi | 75% | 2526 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,553 psi | 64% | 2480 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 43,947 psi | 69% | 2572 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 34,592 psi | 54% | 2421 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,417 psi | 84% | 2736 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,675 psi | 76% | 2549 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,938 psi | 81% | 2615 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,072 psi | 60% | 2448 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,236 psi | 68% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,190 psi | 63% | 2470 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,840 psi | 59% | 2464 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,094 psi | 44% | 2228 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,849 psi | 47% | 2290 fps | 95.2% |
| Alliant Reloder-26 | 64.7 gr | 80% | 29,950 psi | 47% | 2333 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 40,045 psi | 63% | 2513 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 49,284 psi | 77% | 2566 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 37,840 psi | 59% | 2464 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,134 psi | 68% | 2451 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 80% | 49,414 psi | 77% | 2575 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,773 psi | 70% | 2552 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 40,538 psi | 64% | 2434 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 96% | 46,514 psi | 73% | 2572 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,108 psi | 72% | 2562 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,679 psi | 56% | 2346 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,894 psi | 80% | 2615 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,434 psi | 59% | 2523 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 39,958 psi | 63% | 2497 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 43% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,531 psi | 79% | 2562 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,505 psi | 84% | 2582 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,297 psi | 74% | 2507 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,151 psi | 72% | 2484 fps | 98.6% |
| IMR 4350 | <<locked>> | 80% | 38,769 psi | 61% | 2385 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,498 psi | 70% | 2477 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 34,229 psi | 54% | 2320 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 53,272 psi | 83% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,035 psi | 72% | 2526 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 44,962 psi | 70% | 2605 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 50,908 psi | 80% | 2556 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,047 psi | 66% | 2431 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 40,234 psi | 63% | 2415 fps | 97.6% |
| Lovex S071 | <<locked>> | 86% | 30,313 psi | 48% | 2231 fps | 95% |
| Norma 203B | <<locked>> | 80% | 51,285 psi | 80% | 2602 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,828 psi | 64% | 2464 fps | 95.7% |
| Norma MRP | 66 gr | 84% | 34,708 psi | 54% | 2421 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,914 psi | 61% | 2431 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 51,692 psi | 81% | 2625 fps | 100% |
| Ramshot Grand | 72.9 gr | 90% | 44,034 psi | 69% | 2602 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,855 psi | 59% | 2425 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 90% | 38,203 psi | 60% | 2467 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 44% | 1503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,284 psi | 77% | 2562 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,919 psi | 72% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,102 psi | 61% | 2461 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,710 psi | 59% | 2467 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,345 psi | 54% | 2444 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 52,504 psi | 82% | 2559 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,253 psi | 72% | 2513 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,788 psi | 70% | 2510 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 39,320 psi | 62% | 2454 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 43,134 psi | 68% | 2451 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,047 psi | 66% | 2431 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 50,908 psi | 80% | 2556 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,234 psi | 63% | 2415 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,529 psi | 74% | 2566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,297 psi | 74% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,046 psi | 64% | 2379 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,957 psi | 61% | 2451 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,543 psi | 73% | 2513 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,672 psi | 72% | 2500 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,549 psi | 56% | 2395 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,143 psi | 55% | 2339 fps | 95.1% |
| Unknown powder | <<locked>> | 80% | 41,959 psi | 66% | 2484 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,968 psi | 83% | 2523 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,982 psi | 83% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,353 psi | 70% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,379 psi | 63% | 2431 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 36,811 psi | 58% | 2369 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 51,256 psi | 80% | 2536 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,798 psi | 62% | 2434 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 31,140 psi | 49% | 2297 fps | 97.8% |
| Vihtavuori N560 | <<locked>> | 92% | 45,861 psi | 72% | 2638 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 98% | 45,121 psi | 71% | 2618 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,392 psi | 62% | 2402 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,773 psi | 70% | 2552 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,831 psi | 39% | 2211 fps | 97% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,030 psi | 63% | 2441 fps | 95.6% |
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 100 powders for 8 x 57 PCC loaded with the .323 | 220gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,861 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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-26, Ramshot Grand, Norma MRP rank at the top here: for 8 x 57 PCC with the .323 | 220gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Norma 217, ReloadSwiss RS 80 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.