Load Specifications
Bullet:.323 | 220gr | Barnes X S
Bullet Manufacturer:Barnes
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:1:12.0
Load data in caliber 8 x 75 S with .323 | 220gr | Barnes X S bullet and 104 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-17 and ReloadSwiss RS 60.
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>> | 84% | 55,492 psi | 87% | 2490 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,434 psi | 87% | 2533 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,196 psi | 76% | 2523 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 55,405 psi | 87% | 2536 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,099 psi | 85% | 2621 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,029 psi | 89% | 2595 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,520 psi | 85% | 2556 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2648 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,840 psi | 88% | 2546 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,305 psi | 90% | 2513 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,507 psi | 89% | 2713 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,216 psi | 87% | 2579 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,448 psi | 87% | 2595 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,566 psi | 90% | 2707 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,521 psi | 87% | 2694 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2638 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,732 psi | 75% | 2592 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,165 psi | 71% | 2546 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,045 psi | 63% | 2470 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,807 psi | 80% | 2710 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,463 psi | 88% | 2615 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,072 psi | 88% | 2595 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,732 psi | 75% | 2592 fps | 96.7% |
| Bofors RP7 | <<locked>> | 92% | 55,593 psi | 87% | 2572 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,101 psi | 89% | 2523 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,695 psi | 87% | 2582 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,391 psi | 88% | 2605 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 56,144 psi | 88% | 2664 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 92% | 56,144 psi | 88% | 2621 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 84% | 57,638 psi | 90% | 2605 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,389 psi | 85% | 2592 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,174 psi | 90% | 2638 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,941 psi | 88% | 2697 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 57% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,911 psi | 86% | 2556 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,752 psi | 86% | 2539 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,479 psi | 90% | 2582 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,710 psi | 89% | 2566 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 55,579 psi | 87% | 2598 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,681 psi | 89% | 2592 fps | 99.1% |
| IMR 4831 | <<locked>> | 98% | 57,667 psi | 90% | 2654 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,840 psi | 89% | 2621 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 54,491 psi | 85% | 2582 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 82% | 55,840 psi | 88% | 2546 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,682 psi | 90% | 2575 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,985 psi | 88% | 2523 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,621 psi | 86% | 2536 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,000 psi | 89% | 2595 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 54,723 psi | 86% | 2585 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,785 psi | 64% | 2402 fps | 97.5% |
| Norma 201 | <<locked>> | 84% | 56,347 psi | 88% | 2549 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,623 psi | 89% | 2543 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,723 psi | 86% | 2585 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,985 psi | 88% | 2644 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2664 fps | 98.5% |
| Norma URP | <<locked>> | 96% | 55,985 psi | 88% | 2651 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,013 psi | 86% | 2608 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,563 psi | 86% | 2651 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 55,666 psi | 87% | 2572 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,535 psi | 87% | 2585 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,246 psi | 88% | 2589 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,043 psi | 88% | 2657 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,158 psi | 86% | 2687 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,956 psi | 89% | 2690 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,550 psi | 87% | 2710 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 57,609 psi | 90% | 2523 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,811 psi | 89% | 2546 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,144 psi | 88% | 2589 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 2621 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 2628 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 92% | 55,593 psi | 87% | 2572 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,000 psi | 89% | 2595 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,682 psi | 90% | 2575 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,621 psi | 86% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,723 psi | 86% | 2585 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,942 psi | 89% | 2641 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,665 psi | 86% | 2556 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,317 psi | 87% | 2572 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,985 psi | 89% | 2477 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,261 psi | 90% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,029 psi | 89% | 2552 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2621 fps | 97.6% |
| Somchem S335 | <<locked>> | 84% | 56,753 psi | 89% | 2480 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,609 psi | 90% | 2589 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,086 psi | 88% | 2585 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,433 psi | 85% | 2654 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2608 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 84% | 57,188 psi | 90% | 2457 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,840 psi | 89% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,014 psi | 89% | 2523 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,130 psi | 90% | 2559 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,752 psi | 86% | 2595 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,441 psi | 73% | 2484 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 82% | 56,202 psi | 88% | 2543 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,158 psi | 86% | 2523 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,609 psi | 90% | 2654 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,270 psi | 79% | 2615 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,476 psi | 85% | 2572 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,362 psi | 88% | 2589 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,144 psi | 88% | 2664 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,843 psi | 64% | 2585 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,230 psi | 87% | 2579 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,256 psi | 79% | 2546 fps | 96.8% |
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% | 49,298 psi | 77% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,238 psi | 72% | 2392 fps | 96.8% |
| Accurate 3100 | <<locked>> | 88% | 33,417 psi | 52% | 2251 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,601 psi | 73% | 2418 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,824 psi | 55% | 2290 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 80% | 50,589 psi | 79% | 2507 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,236 psi | 68% | 2379 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 94% | 45,556 psi | 71% | 2497 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,475 psi | 82% | 2500 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,867 psi | 84% | 2474 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,354 psi | 73% | 2559 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,540 psi | 68% | 2402 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,340 psi | 73% | 2461 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,084 psi | 53% | 2290 fps | 97.5% |
| Alliant Reloder-17 | 51.6 gr | 80% | 37,826 psi | 59% | 2402 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,438 psi | 67% | 2448 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 96% | 42,279 psi | 66% | 2490 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,773 psi | 40% | 2096 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,736 psi | 53% | 2323 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 84% | 30,472 psi | 48% | 2283 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,879 psi | 78% | 2520 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 43,976 psi | 69% | 2418 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 42,279 psi | 66% | 2490 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,102 psi | 61% | 2297 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,954 psi | 85% | 2480 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,054 psi | 82% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,193 psi | 69% | 2418 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 36,318 psi | 57% | 2320 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 41,640 psi | 65% | 2382 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,155 psi | 80% | 2513 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,792 psi | 50% | 2205 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,282 psi | 74% | 2500 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,205 psi | 63% | 2431 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 43% | 1391 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,863 psi | 77% | 2470 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,503 psi | 81% | 2497 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,455 psi | 71% | 2405 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,543 psi | 75% | 2425 fps | 97.8% |
| IMR 4350 | <<locked>> | 84% | 39,059 psi | 61% | 2323 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,089 psi | 63% | 2320 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 33,576 psi | 53% | 2251 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 47,500 psi | 74% | 2484 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 51,358 psi | 80% | 2536 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 52,475 psi | 82% | 2500 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,778 psi | 80% | 2487 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,922 psi | 78% | 2438 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,948 psi | 72% | 2411 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,276 psi | 60% | 2287 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 36,535 psi | 57% | 2270 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 34,287 psi | 54% | 2270 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,212 psi | 79% | 2464 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,140 psi | 79% | 2457 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,745 psi | 72% | 2448 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 43,482 psi | 68% | 2444 fps | 95% |
| Norma MRP | <<locked>> | 92% | 39,189 psi | 61% | 2461 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 34,563 psi | 54% | 2283 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 45,266 psi | 71% | 2464 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 35,592 psi | 56% | 2316 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 52,388 psi | 82% | 2523 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,228 psi | 82% | 2539 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,833 psi | 44% | 1424 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,121 psi | 69% | 2402 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,197 psi | 77% | 2559 fps | 99.9% |
| ReloadSwiss RS 60 | 51.6 gr | 80% | 40,030 psi | 63% | 2451 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,171 psi | 54% | 2303 fps | 97% |
| ReloadSwiss RS 70 | 52.4 gr | 80% | 33,533 psi | 53% | 2297 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 54,650 psi | 86% | 2487 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,979 psi | 75% | 2421 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,553 psi | 65% | 2372 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 96% | 50,024 psi | 78% | 2523 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 41,423 psi | 65% | 2431 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 39,102 psi | 61% | 2297 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,276 psi | 60% | 2287 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,778 psi | 80% | 2487 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,948 psi | 72% | 2411 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,535 psi | 57% | 2270 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,713 psi | 65% | 2408 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,343 psi | 80% | 2507 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,892 psi | 77% | 2480 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,836 psi | 80% | 2398 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,917 psi | 67% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,289 psi | 58% | 2231 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 43,569 psi | 68% | 2474 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 50,691 psi | 79% | 2402 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,850 psi | 80% | 2497 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,003 psi | 66% | 2369 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,415 psi | 49% | 2254 fps | 99.3% |
| Somchem S385 | <<locked>> | 90% | 39,813 psi | 62% | 2375 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,155 psi | 80% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,703 psi | 75% | 2388 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,616 psi | 75% | 2398 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,900 psi | 63% | 2306 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,752 psi | 56% | 2277 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 96% | 41,350 psi | 65% | 2392 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,953 psi | 83% | 2500 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,977 psi | 72% | 2398 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,476 psi | 56% | 2287 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 80% | 27,760 psi | 44% | 2165 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,143 psi | 55% | 2254 fps | 99.1% |
| Winchester 748 | <<locked>> | 80% | 52,881 psi | 83% | 2543 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 36,477 psi | 57% | 2326 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,744 psi | 40% | 2165 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,733 psi | 76% | 2487 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,222 psi | 69% | 2448 fps | 95.3% |
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 104 powders for 8 x 75 S loaded with the .323 | 220gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,713 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,713 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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-17, ReloadSwiss RS 60 rank at the top here: for 8 x 75 S with the .323 | 220gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.