Load Specifications
Load data in caliber 8 x 64 S with .323 | 220gr | A-Square MONO RN 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-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>> | 84% | 50,270 psi | 86% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 52,156 psi | 89% | 2457 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,772 psi | 75% | 2425 fps | 97.6% |
| Accurate 4064 | <<locked>> | 86% | 50,459 psi | 86% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 49,908 psi | 85% | 2533 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 82% | 50,502 psi | 86% | 2477 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 51,532 psi | 88% | 2480 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,517 psi | 88% | 2562 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 52,692 psi | 90% | 2477 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 49,763 psi | 85% | 2582 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 51,619 psi | 88% | 2503 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 51,895 psi | 88% | 2520 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 51,053 psi | 87% | 2582 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,040 psi | 89% | 2615 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,386 psi | 86% | 2549 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,655 psi | 71% | 2451 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,833 psi | 80% | 2608 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 49,864 psi | 85% | 2490 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 52,112 psi | 89% | 2516 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 52,098 psi | 89% | 2493 fps | 97.7% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,025 psi | 89% | 2507 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 52,649 psi | 90% | 2526 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 52,605 psi | 90% | 2582 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 92% | 53,026 psi | 90% | 2543 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 82% | 51,024 psi | 87% | 2487 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 51,053 psi | 87% | 2520 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 50,270 psi | 86% | 2516 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,533 psi | 89% | 2612 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 61% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 51,895 psi | 88% | 2487 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 51,155 psi | 87% | 2470 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 51,039 psi | 87% | 2467 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 50,618 psi | 86% | 2444 fps | 97.9% |
| IMR 4350 | <<locked>> | 96% | 52,460 psi | 89% | 2520 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 50,604 psi | 86% | 2474 fps | 97.9% |
| IMR 4831 | <<locked>> | 96% | 50,502 psi | 86% | 2526 fps | 99.7% |
| IMR 4895 | <<locked>> | 84% | 50,053 psi | 85% | 2500 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 52,692 psi | 90% | 2477 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 50,053 psi | 85% | 2454 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,098 psi | 90% | 2457 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 50,966 psi | 87% | 2464 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 50,256 psi | 86% | 2470 fps | 98.9% |
| Lovex S070 | <<locked>> | 94% | 50,981 psi | 87% | 2500 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 52,562 psi | 89% | 2474 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,127 psi | 90% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 86% | 51,184 psi | 87% | 2507 fps | 100% |
| Norma 204 | <<locked>> | 96% | 52,678 psi | 90% | 2562 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 46,528 psi | 79% | 2566 fps | 97.2% |
| Norma URP | <<locked>> | 96% | 52,301 psi | 89% | 2569 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 51,576 psi | 88% | 2533 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 51,082 psi | 87% | 2566 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 52,547 psi | 89% | 2497 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 52,272 psi | 89% | 2510 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,390 psi | 62% | 1572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 52,866 psi | 90% | 2510 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 52,373 psi | 89% | 2579 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 51,721 psi | 88% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 52,895 psi | 90% | 2602 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 52,127 psi | 89% | 2625 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 86% | 52,982 psi | 90% | 2470 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,011 psi | 89% | 2510 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,327 psi | 84% | 2536 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 52,098 psi | 89% | 2493 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 50,256 psi | 86% | 2470 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 50,053 psi | 85% | 2454 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 50,966 psi | 87% | 2464 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 50,981 psi | 87% | 2500 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 50,082 psi | 85% | 2516 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 51,300 psi | 87% | 2480 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,098 psi | 89% | 2500 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 50,546 psi | 86% | 2372 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 50,879 psi | 87% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 50,227 psi | 86% | 2428 fps | 97.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,863 psi | 83% | 2530 fps | 96.3% |
| Somchem S335 | <<locked>> | 82% | 50,256 psi | 86% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 50,763 psi | 86% | 2467 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 52,315 psi | 89% | 2507 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 50,560 psi | 86% | 2572 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,995 psi | 85% | 2516 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 82% | 50,952 psi | 87% | 2359 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,055 psi | 90% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 50,430 psi | 86% | 2415 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 50,270 psi | 86% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 51,474 psi | 88% | 2520 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 52,924 psi | 90% | 2474 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 51,692 psi | 88% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 50,444 psi | 86% | 2523 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,006 psi | 78% | 2516 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 51,285 psi | 87% | 2500 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 52,939 psi | 90% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 52,605 psi | 90% | 2582 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,231 psi | 63% | 2470 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 51,866 psi | 88% | 2507 fps | 100% |
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% | 44,222 psi | 75% | 2326 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,018 psi | 73% | 2310 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 35,868 psi | 61% | 2280 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,829 psi | 71% | 2329 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,951 psi | 53% | 2182 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 47,500 psi | 81% | 2431 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,292 psi | 69% | 2297 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 98% | 48,370 psi | 82% | 2510 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,603 psi | 84% | 2434 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,424 psi | 74% | 2474 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,306 psi | 69% | 2323 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,163 psi | 73% | 2379 fps | 99.3% |
| Alliant Reloder-16 | 47.9 gr | 80% | 31,256 psi | 53% | 2192 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,809 psi | 59% | 2306 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,384 psi | 81% | 2500 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,166 psi | 46% | 2116 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,938 psi | 56% | 2320 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,688 psi | 79% | 2441 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 40,016 psi | 68% | 2326 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 40,770 psi | 69% | 2303 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,689 psi | 83% | 2457 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,611 psi | 69% | 2329 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 40,292 psi | 69% | 2375 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 43,903 psi | 75% | 2395 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 48,008 psi | 82% | 2441 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,790 psi | 49% | 2106 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,874 psi | 75% | 2418 fps | 99.9% |
| Hodgdon Superformance | 59.9 gr | 88% | 42,453 psi | 72% | 2441 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 46% | 1368 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,861 psi | 78% | 2395 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 47,935 psi | 82% | 2425 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,351 psi | 72% | 2329 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,643 psi | 76% | 2346 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 40,930 psi | 70% | 2329 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,769 psi | 68% | 2283 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 29,994 psi | 51% | 2142 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 44,251 psi | 75% | 2405 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 49,603 psi | 84% | 2434 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,007 psi | 80% | 2411 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,079 psi | 80% | 2369 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 42,351 psi | 72% | 2329 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,882 psi | 59% | 2192 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 39,929 psi | 68% | 2313 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 46,485 psi | 79% | 2385 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,949 psi | 80% | 2388 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,540 psi | 72% | 2369 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 46,180 psi | 79% | 2461 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 40,814 psi | 69% | 2457 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 31,227 psi | 53% | 2182 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 42,148 psi | 72% | 2382 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 37,028 psi | 63% | 2316 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 49,327 psi | 84% | 2448 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,008 psi | 83% | 2464 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 46% | 1401 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,886 psi | 70% | 2313 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,803 psi | 78% | 2477 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,043 psi | 63% | 2362 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,764 psi | 56% | 2244 fps | 95.8% |
| ReloadSwiss RS 70 | 55 gr | 84% | 34,954 psi | 60% | 2300 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 44,280 psi | 75% | 2343 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,637 psi | 64% | 2277 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 46,238 psi | 79% | 2487 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 84% | 40,770 psi | 69% | 2303 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,882 psi | 59% | 2192 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,007 psi | 80% | 2411 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,351 psi | 72% | 2329 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 39,929 psi | 68% | 2313 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,667 psi | 66% | 2326 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,747 psi | 81% | 2425 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,948 psi | 78% | 2408 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,732 psi | 81% | 2333 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,885 psi | 68% | 2218 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,667 psi | 66% | 2234 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,803 psi | 78% | 2480 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,297 psi | 81% | 2336 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,529 psi | 81% | 2421 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 38,406 psi | 65% | 2280 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 28,050 psi | 48% | 2142 fps | 97.6% |
| Somchem S385 | <<locked>> | 94% | 41,162 psi | 70% | 2372 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 48,109 psi | 82% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,019 psi | 75% | 2320 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,353 psi | 76% | 2329 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,463 psi | 62% | 2221 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 32,663 psi | 56% | 2185 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 49,719 psi | 85% | 2431 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,699 psi | 73% | 2323 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,024 psi | 55% | 2185 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 29,225 psi | 50% | 2182 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,213 psi | 55% | 2162 fps | 97.9% |
| Winchester 748 | <<locked>> | 80% | 49,748 psi | 85% | 2474 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,538 psi | 69% | 2379 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,137 psi | 46% | 2182 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,397 psi | 77% | 2408 fps | 99.9% |
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 112 powders for 8 x 64 S loaded with the .323 | 220gr | A-Square MONO RN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,532 fps to 2,625 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (405 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:6.0 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 64 S with the .323 | 220gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Alliant Reloder-22 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.