Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:220 gr
Bullet Diameter:0.323"
Bullet Length:<<locked>>
Caliber:8 x 75 S load data
Case Length (l3):2.941"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:25.6"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:13.0
Load data in caliber 8 x 75 S with .323 | 220gr | Sierra GameKing bullet and 109 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 56,536 psi | 89% | 2503 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,028 psi | 88% | 2536 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,101 psi | 89% | 2595 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,070 psi | 85% | 2549 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2530 fps | 98.8% |
| Accurate 4064 | <<locked>> | 88% | 55,985 psi | 88% | 2582 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,188 psi | 88% | 2684 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 50,386 psi | 79% | 2707 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 84% | 55,767 psi | 87% | 2615 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,623 psi | 89% | 2615 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2671 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,520 psi | 85% | 2562 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,014 psi | 88% | 2530 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,434 psi | 87% | 2733 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,507 psi | 89% | 2625 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,188 psi | 90% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,493 psi | 90% | 2657 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,884 psi | 89% | 2730 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,578 psi | 86% | 2713 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,707 psi | 83% | 2657 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2602 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,671 psi | 68% | 2552 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,537 psi | 60% | 2474 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2723 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,535 psi | 87% | 2635 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 54,143 psi | 85% | 2605 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2602 fps | 96.7% |
| Bofors RP7 | <<locked>> | 94% | 57,624 psi | 90% | 2638 fps | 99.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,985 psi | 88% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,056 psi | 85% | 2592 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,071 psi | 86% | 2625 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 54,810 psi | 86% | 2680 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 92% | 55,158 psi | 86% | 2641 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 84% | 56,347 psi | 88% | 2621 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,840 psi | 89% | 2654 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,028 psi | 88% | 2654 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,042 psi | 86% | 2720 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,085 psi | 57% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,450 psi | 90% | 2621 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,826 psi | 89% | 2595 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,275 psi | 88% | 2598 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,782 psi | 87% | 2585 fps | 99.2% |
| IMR 4350 | <<locked>> | 96% | 54,447 psi | 85% | 2615 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,854 psi | 88% | 2615 fps | 99.2% |
| IMR 4831 | <<locked>> | 98% | 56,347 psi | 88% | 2671 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 55,608 psi | 87% | 2638 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 53,621 psi | 84% | 2605 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 82% | 54,520 psi | 85% | 2562 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,753 psi | 87% | 2585 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,824 psi | 86% | 2543 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,231 psi | 88% | 2592 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,550 psi | 87% | 2612 fps | 99.8% |
| Lovex S070 | <<locked>> | 96% | 56,594 psi | 89% | 2648 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,435 psi | 60% | 2395 fps | 97.2% |
| Norma 201 | <<locked>> | 84% | 54,433 psi | 85% | 2559 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,071 psi | 86% | 2556 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,666 psi | 89% | 2644 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,158 psi | 86% | 2667 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 48,921 psi | 77% | 2680 fps | 98.6% |
| Norma URP | <<locked>> | 96% | 54,868 psi | 86% | 2667 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 57,508 psi | 90% | 2674 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,232 psi | 90% | 2720 fps | 99.8% |
| Ramshot TAC | <<locked>> | 82% | 54,549 psi | 85% | 2589 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,447 psi | 85% | 2602 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,622 psi | 57% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,056 psi | 86% | 2608 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,665 psi | 86% | 2674 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,114 psi | 85% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,695 psi | 87% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,752 psi | 86% | 2733 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 55,521 psi | 87% | 2536 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,114 psi | 86% | 2559 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,331 psi | 85% | 2602 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,579 psi | 87% | 2641 fps | 97.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,619 psi | 81% | 2641 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 94% | 57,624 psi | 90% | 2638 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,550 psi | 87% | 2612 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,753 psi | 87% | 2585 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,231 psi | 88% | 2592 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,594 psi | 89% | 2648 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,854 psi | 88% | 2657 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,913 psi | 89% | 2621 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,464 psi | 90% | 2631 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,506 psi | 87% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,159 psi | 88% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,506 psi | 87% | 2569 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 2638 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 55,114 psi | 86% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,608 psi | 89% | 2608 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,549 psi | 85% | 2598 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2638 fps | 96.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 2713 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 2621 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 84% | 55,883 psi | 88% | 2474 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,187 psi | 86% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,666 psi | 87% | 2539 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,883 psi | 88% | 2575 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,392 psi | 90% | 2664 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,165 psi | 71% | 2497 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 82% | 55,027 psi | 86% | 2562 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,261 psi | 90% | 2582 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,217 psi | 88% | 2671 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,805 psi | 76% | 2625 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,043 psi | 89% | 2635 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,085 psi | 86% | 2605 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,071 psi | 86% | 2684 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,218 psi | 61% | 2592 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,551 psi | 90% | 2641 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,197 psi | 77% | 2566 fps | 97% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 53,229 psi | 83% | 2461 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,108 psi | 72% | 2408 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,534 psi | 84% | 2549 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,512 psi | 70% | 2402 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 33,025 psi | 52% | 2280 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 43,656 psi | 68% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,489 psi | 51% | 2280 fps | 97.1% |
| Accurate High Country | <<locked>> | 98% | 47,181 psi | 74% | 2651 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 49,124 psi | 77% | 2520 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,785 psi | 65% | 2388 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 41,713 psi | 65% | 2464 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,213 psi | 80% | 2516 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,344 psi | 82% | 2487 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,310 psi | 71% | 2575 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,763 psi | 78% | 2530 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,887 psi | 66% | 2411 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,730 psi | 70% | 2470 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,547 psi | 51% | 2290 fps | 97.3% |
| Alliant Reloder-17 | 53.7 gr | 80% | 36,230 psi | 57% | 2402 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 41,089 psi | 64% | 2457 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 96% | 40,741 psi | 64% | 2497 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 25,048 psi | 39% | 2116 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 31,937 psi | 50% | 2316 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 86% | 30,313 psi | 48% | 2323 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,515 psi | 76% | 2533 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 41,829 psi | 66% | 2421 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 40,741 psi | 64% | 2497 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 37,391 psi | 59% | 2300 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,605 psi | 82% | 2497 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,705 psi | 79% | 2546 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,293 psi | 66% | 2425 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 37,043 psi | 58% | 2375 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 40,350 psi | 63% | 2395 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 49,617 psi | 78% | 2526 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,892 psi | 47% | 2195 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,919 psi | 72% | 2513 fps | 100% |
| Hodgdon Superformance | 59.6 gr | 84% | 38,696 psi | 61% | 2434 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,977 psi | 42% | 1407 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,427 psi | 74% | 2484 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 49,937 psi | 78% | 2510 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,932 psi | 69% | 2415 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,253 psi | 72% | 2441 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 37,623 psi | 59% | 2329 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,725 psi | 61% | 2329 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 31,546 psi | 49% | 2241 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 45,847 psi | 72% | 2493 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 50,314 psi | 79% | 2552 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 51,213 psi | 80% | 2516 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,950 psi | 77% | 2497 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,617 psi | 76% | 2451 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 43,976 psi | 69% | 2415 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,274 psi | 57% | 2283 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 36,637 psi | 57% | 2313 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 33,866 psi | 53% | 2300 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 48,138 psi | 75% | 2470 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,646 psi | 76% | 2470 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,092 psi | 69% | 2457 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 42,250 psi | 66% | 2457 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 37,536 psi | 59% | 2461 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 32,764 psi | 51% | 2280 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 44,034 psi | 69% | 2477 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 33,910 psi | 53% | 2316 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 51,039 psi | 80% | 2539 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,923 psi | 80% | 2552 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 43% | 1440 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,612 psi | 67% | 2411 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,834 psi | 75% | 2572 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,580 psi | 60% | 2457 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,169 psi | 50% | 2293 fps | 96.6% |
| ReloadSwiss RS 70 | 54.6 gr | 80% | 31,952 psi | 50% | 2297 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 52,373 psi | 82% | 2493 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,905 psi | 72% | 2428 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,407 psi | 62% | 2369 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 45,948 psi | 72% | 2490 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 42,467 psi | 67% | 2487 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 37,391 psi | 59% | 2300 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,274 psi | 57% | 2283 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,950 psi | 77% | 2497 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,976 psi | 69% | 2415 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 36,637 psi | 57% | 2313 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,292 psi | 63% | 2418 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,617 psi | 78% | 2516 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,616 psi | 75% | 2497 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,168 psi | 77% | 2408 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,263 psi | 65% | 2293 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 35,360 psi | 55% | 2231 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 42,061 psi | 66% | 2484 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 48,921 psi | 77% | 2411 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,400 psi | 77% | 2510 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,929 psi | 63% | 2372 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 50,473 psi | 79% | 2536 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 29,312 psi | 46% | 2238 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 37,855 psi | 59% | 2372 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 49,632 psi | 78% | 2395 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,658 psi | 72% | 2395 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,195 psi | 72% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,130 psi | 60% | 2310 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,040 psi | 53% | 2277 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 39,813 psi | 62% | 2402 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 51,547 psi | 81% | 2516 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,338 psi | 69% | 2405 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,489 psi | 52% | 2280 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 27,108 psi | 42% | 2188 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,489 psi | 52% | 2254 fps | 99% |
| Winchester 748 | <<locked>> | 80% | 51,634 psi | 81% | 2559 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 37,043 psi | 58% | 2375 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,990 psi | 39% | 2188 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,297 psi | 74% | 2500 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 42,975 psi | 67% | 2461 fps | 95.4% |
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 122 powders for 8 x 75 S loaded with the .323 | 220gr | Sierra GameKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,733 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,733 fps. Accurate 3100 gives the best case fill at 100 %, and 122 of the 122 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, 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 High Country, Accurate MAGPRO 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8 x 75 S with the .323 | 220gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Hodgdon H1000, Hodgdon Retumbo 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.