Load Specifications
Load data in caliber 8 x 75 RS with .323 | 220gr | Sierra GameKing bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 49,182 psi | 89% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,646 psi | 88% | 2464 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,398 psi | 84% | 2533 fps | 98.8% |
| Accurate 4064 | <<locked>> | 84% | 49,603 psi | 90% | 2500 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 49,081 psi | 89% | 2585 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 84% | 47,398 psi | 86% | 2484 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 96% | 47,355 psi | 86% | 2566 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 48,501 psi | 88% | 2628 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 47,587 psi | 86% | 2503 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 47,848 psi | 87% | 2520 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 47,195 psi | 86% | 2589 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 47,718 psi | 87% | 2615 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,588 psi | 90% | 2608 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 46,485 psi | 84% | 2605 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,816 psi | 80% | 2556 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,435 psi | 70% | 2474 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,400 psi | 90% | 2723 fps | 100% |
| Bofors RP3 | <<locked>> | 84% | 47,630 psi | 86% | 2513 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 46,485 psi | 84% | 2605 fps | 96.8% |
| Bofors RP7 | <<locked>> | 88% | 47,950 psi | 87% | 2497 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 84% | 48,269 psi | 88% | 2526 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 88% | 49,269 psi | 89% | 2598 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 47,369 psi | 86% | 2523 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 47,079 psi | 85% | 2526 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 49,414 psi | 90% | 2566 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 47,979 psi | 87% | 2612 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 65% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 46,862 psi | 85% | 2474 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 48,791 psi | 89% | 2493 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 49,400 psi | 90% | 2503 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,660 psi | 88% | 2480 fps | 98.3% |
| IMR 4350 | <<locked>> | 92% | 48,109 psi | 87% | 2523 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 49,429 psi | 90% | 2520 fps | 98.4% |
| IMR 4831 | <<locked>> | 96% | 47,355 psi | 86% | 2546 fps | 99.8% |
| IMR 4895 | <<locked>> | 82% | 49,095 psi | 89% | 2546 fps | 100% |
| Lovex S062 | <<locked>> | 82% | 46,818 psi | 85% | 2461 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 49,153 psi | 89% | 2520 fps | 99.3% |
| Lovex S070 | <<locked>> | 90% | 47,166 psi | 86% | 2510 fps | 98.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,537 psi | 70% | 2398 fps | 97.2% |
| Norma 203B | <<locked>> | 82% | 47,181 psi | 86% | 2510 fps | 100% |
| Norma 204 | <<locked>> | 92% | 48,240 psi | 88% | 2562 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 49,066 psi | 89% | 2684 fps | 98.6% |
| Norma URP | <<locked>> | 92% | 48,283 psi | 88% | 2572 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 82% | 47,108 psi | 85% | 2530 fps | 100% |
| Ramshot Hunter | <<locked>> | 92% | 47,065 psi | 85% | 2572 fps | 98.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,223 psi | 82% | 2559 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 66% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 48,486 psi | 88% | 2510 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 47,311 psi | 86% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 48,675 psi | 88% | 2605 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 47,747 psi | 87% | 2628 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 82% | 48,907 psi | 89% | 2474 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 47,761 psi | 87% | 2510 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 49,168 psi | 89% | 2543 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 98% | 48,399 psi | 88% | 2592 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 88% | 47,950 psi | 87% | 2497 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 49,153 psi | 89% | 2520 fps | 99.3% |
| Shooters World Precision | <<locked>> | 82% | 46,818 psi | 85% | 2461 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 47,166 psi | 86% | 2510 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 49,037 psi | 89% | 2566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 49,676 psi | 90% | 2418 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 48,892 psi | 89% | 2474 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,950 psi | 87% | 2585 fps | 97.1% |
| Somchem S355 | <<locked>> | 86% | 48,138 psi | 87% | 2510 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 46,601 psi | 85% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 49,255 psi | 89% | 2575 fps | 98.1% |
| Unknown powder | <<locked>> | 90% | 49,153 psi | 89% | 2579 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 48,733 psi | 88% | 2438 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 49,153 psi | 89% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 49,182 psi | 89% | 2490 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 47,340 psi | 86% | 2523 fps | 99.7% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,310 psi | 82% | 2500 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 82% | 47,340 psi | 86% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 49,400 psi | 90% | 2572 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,689 psi | 88% | 2621 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 49,864 psi | 90% | 2543 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 49,269 psi | 89% | 2598 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,334 psi | 71% | 2595 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,587 psi | 86% | 2539 fps | 96.6% |
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 2495 | <<locked>> | 80% | 46,253 psi | 84% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 40,103 psi | 73% | 2316 fps | 95.6% |
| Accurate 3100 | <<locked>> | 90% | 33,127 psi | 60% | 2283 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 43,787 psi | 79% | 2415 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,590 psi | 59% | 2283 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 80% | 41,916 psi | 76% | 2388 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 94% | 44,382 psi | 81% | 2513 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,179 psi | 82% | 2572 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,800 psi | 76% | 2411 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,860 psi | 81% | 2474 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,445 psi | 59% | 2290 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,332 psi | 66% | 2405 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 41,205 psi | 75% | 2457 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 40,814 psi | 74% | 2500 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 25,150 psi | 46% | 2119 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 32,024 psi | 58% | 2320 fps | 95.2% |
| Alliant Reloder-26 | 59.3 gr | 86% | 30,385 psi | 55% | 2326 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 41,742 psi | 76% | 2418 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 40,814 psi | 74% | 2500 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 37,318 psi | 68% | 2300 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 42,409 psi | 77% | 2428 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 80% | 37,565 psi | 68% | 2385 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 86% | 41,872 psi | 76% | 2425 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,979 psi | 54% | 2198 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,352 psi | 79% | 2470 fps | 100% |
| Hodgdon Superformance | 59.7 gr | 84% | 38,769 psi | 70% | 2438 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 49% | 1407 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,150 psi | 80% | 2431 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 45,832 psi | 83% | 2451 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,046 psi | 74% | 2365 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,654 psi | 74% | 2339 fps | 96.6% |
| IMR 4350 | <<locked>> | 84% | 37,550 psi | 68% | 2329 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,841 psi | 70% | 2333 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 28,660 psi | 52% | 2172 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 46,006 psi | 83% | 2500 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,106 psi | 80% | 2418 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,361 psi | 66% | 2287 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 36,767 psi | 67% | 2313 fps | 95.8% |
| Lovex S071 | <<locked>> | 94% | 31,923 psi | 58% | 2257 fps | 95% |
| Norma 203B | <<locked>> | 80% | 44,237 psi | 80% | 2461 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 42,163 psi | 77% | 2457 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 37,434 psi | 68% | 2461 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 32,692 psi | 59% | 2280 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 43,947 psi | 80% | 2477 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 34,011 psi | 62% | 2316 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 42,018 psi | 76% | 2500 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,296 psi | 50% | 1440 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,525 psi | 77% | 2408 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,653 psi | 70% | 2457 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,155 psi | 58% | 2293 fps | 96.6% |
| ReloadSwiss RS 70 | 54.6 gr | 80% | 31,879 psi | 58% | 2297 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 45,818 psi | 83% | 2428 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,320 psi | 71% | 2369 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 46,108 psi | 84% | 2493 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 42,554 psi | 77% | 2490 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 37,318 psi | 68% | 2300 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,361 psi | 66% | 2287 fps | 96.8% |
| Shooters World Precision | <<locked>> | 80% | 44,106 psi | 80% | 2418 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 36,767 psi | 67% | 2313 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,219 psi | 73% | 2415 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,379 psi | 75% | 2297 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 35,491 psi | 64% | 2234 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 42,163 psi | 77% | 2487 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 40,089 psi | 73% | 2372 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 29,399 psi | 53% | 2241 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 37,956 psi | 69% | 2375 fps | 95.3% |
| Unknown powder | <<locked>> | 80% | 35,491 psi | 64% | 2329 fps | 97.2% |
| Vihtavuori N135 | <<locked>> | 80% | 45,832 psi | 83% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,064 psi | 84% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,058 psi | 69% | 2310 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,127 psi | 62% | 2280 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 39,711 psi | 72% | 2398 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 44,469 psi | 81% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,620 psi | 61% | 2283 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 27,035 psi | 49% | 2185 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,591 psi | 61% | 2257 fps | 99% |
| Winchester 760 | <<locked>> | 80% | 37,565 psi | 68% | 2385 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 25,077 psi | 46% | 2192 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,222 psi | 80% | 2484 fps | 95.8% |
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 93 powders for 8 x 75 RS loaded with the .323 | 220gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,723 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,723 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 65–90 %, 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for 8 x 75 RS 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, Baschieri & Pellagri 109, Hodgdon H4831 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.