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 68 S load data
Case Length (l3):2.657"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:86 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:12.0
Load data in caliber 8 x 68 S with .323 | 220gr | Barnes X S bullet and 107 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 2495 | <<locked>> | 82% | 54,911 psi | 86% | 2510 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,578 psi | 86% | 2556 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,547 psi | 81% | 2605 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 54,737 psi | 86% | 2556 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,508 psi | 90% | 2697 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2779 fps | 97.7% |
| ADI AR 2206H | <<locked>> | 82% | 56,086 psi | 88% | 2615 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,043 psi | 89% | 2621 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,317 psi | 85% | 2680 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2667 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,811 psi | 87% | 2736 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2726 fps | 98.7% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2726 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,491 psi | 85% | 2598 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,737 psi | 86% | 2618 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,421 psi | 90% | 2740 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,201 psi | 87% | 2720 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2720 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,604 psi | 79% | 2674 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,964 psi | 75% | 2618 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,395 psi | 66% | 2552 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,317 psi | 85% | 2795 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,738 psi | 87% | 2635 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,731 psi | 73% | 2608 fps | 96.9% |
| Bofors RP3 | <<locked>> | 86% | 55,506 psi | 87% | 2615 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,604 psi | 79% | 2674 fps | 97.8% |
| Bofors RP7 | <<locked>> | 90% | 54,694 psi | 86% | 2595 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 55,680 psi | 87% | 2628 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,695 psi | 87% | 2694 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 55,738 psi | 87% | 2651 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 2671 fps | 96.5% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,389 psi | 85% | 2654 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 82% | 56,710 psi | 89% | 2621 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,667 psi | 90% | 2664 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,652 psi | 89% | 2661 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,434 psi | 87% | 2726 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,566 psi | 90% | 2625 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,261 psi | 90% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,579 psi | 89% | 2602 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,912 psi | 88% | 2589 fps | 99.4% |
| IMR 4350 | <<locked>> | 94% | 55,027 psi | 86% | 2628 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,912 psi | 88% | 2618 fps | 99.3% |
| IMR 4831 | <<locked>> | 96% | 57,537 psi | 90% | 2684 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,086 psi | 88% | 2641 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2661 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 49,603 psi | 78% | 2644 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 56,971 psi | 89% | 2595 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,013 psi | 86% | 2543 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,130 psi | 90% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,376 psi | 88% | 2621 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 57,653 psi | 90% | 2661 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,555 psi | 68% | 2480 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 55,492 psi | 87% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,811 psi | 87% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,392 psi | 90% | 2651 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,506 psi | 87% | 2674 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 53,330 psi | 84% | 2749 fps | 99.3% |
| Norma URP | <<locked>> | 94% | 55,869 psi | 88% | 2680 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,317 psi | 85% | 2631 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,690 psi | 78% | 2654 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 94% | 54,302 psi | 85% | 2680 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,527 psi | 70% | 2546 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,333 psi | 59% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,637 psi | 87% | 2615 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,477 psi | 87% | 2680 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,708 psi | 86% | 2710 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,681 psi | 89% | 2717 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,158 psi | 86% | 2743 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,278 psi | 65% | 2566 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,130 psi | 88% | 2566 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,637 psi | 87% | 2612 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,999 psi | 88% | 2648 fps | 97.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2707 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 54,694 psi | 86% | 2595 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,376 psi | 88% | 2621 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,971 psi | 89% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,130 psi | 90% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,653 psi | 90% | 2661 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,434 psi | 88% | 2664 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,406 psi | 90% | 2625 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,534 psi | 85% | 2592 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,825 psi | 87% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,318 psi | 88% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,318 psi | 88% | 2579 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2700 fps | 98.5% |
| Somchem S335 | <<locked>> | 82% | 55,811 psi | 87% | 2497 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,753 psi | 89% | 2608 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,550 psi | 87% | 2608 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,462 psi | 85% | 2598 fps | 96.2% |
| Somchem S365 | <<locked>> | 96% | 54,636 psi | 86% | 2680 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 2684 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 82% | 56,159 psi | 88% | 2474 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,173 psi | 88% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,985 psi | 88% | 2539 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,521 psi | 89% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,462 psi | 85% | 2625 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,342 psi | 77% | 2562 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 86% | 57,493 psi | 90% | 2582 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,000 psi | 89% | 2680 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2687 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2736 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,392 psi | 90% | 2641 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,695 psi | 87% | 2694 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,439 psi | 68% | 2674 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,418 psi | 85% | 2598 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 2628 fps | 97.9% |
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% | 51,677 psi | 81% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,283 psi | 76% | 2461 fps | 97.7% |
| Accurate 3100 | <<locked>> | 84% | 31,444 psi | 49% | 2231 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,878 psi | 77% | 2477 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,970 psi | 58% | 2362 fps | 98.5% |
| Accurate High Country | <<locked>> | 94% | 45,513 psi | 71% | 2621 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 52,866 psi | 83% | 2569 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,121 psi | 71% | 2441 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 42,598 psi | 67% | 2480 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 98% | 48,834 psi | 77% | 2618 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,878 psi | 77% | 2635 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,612 psi | 67% | 2480 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,612 psi | 67% | 2480 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,745 psi | 72% | 2467 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,573 psi | 76% | 2526 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,853 psi | 56% | 2365 fps | 98.5% |
| Alliant Reloder-17 | 54.5 gr | 80% | 40,045 psi | 63% | 2477 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,177 psi | 66% | 2474 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 39,813 psi | 62% | 2474 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,021 psi | 42% | 2165 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,850 psi | 50% | 2306 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 82% | 30,269 psi | 47% | 2313 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,301 psi | 82% | 2589 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 41,524 psi | 65% | 2510 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,238 psi | 72% | 2484 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 39,813 psi | 62% | 2474 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,017 psi | 64% | 2365 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 46,528 psi | 73% | 2490 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,406 psi | 60% | 2395 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 41,220 psi | 65% | 2408 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 48,979 psi | 77% | 2569 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,082 psi | 80% | 2605 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 53,432 psi | 84% | 2579 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,460 psi | 52% | 2270 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,719 psi | 78% | 2566 fps | 100% |
| Hodgdon Superformance | 57.6 gr | 80% | 37,333 psi | 59% | 2402 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 43% | 1417 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,082 psi | 80% | 2536 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,085 psi | 85% | 2556 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,427 psi | 74% | 2470 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,472 psi | 78% | 2493 fps | 98.6% |
| IMR 4350 | <<locked>> | 80% | 36,550 psi | 57% | 2300 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,916 psi | 66% | 2388 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 35,534 psi | 56% | 2320 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 49,821 psi | 78% | 2552 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,037 psi | 75% | 2516 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 46,659 psi | 73% | 2592 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 53,403 psi | 84% | 2549 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,822 psi | 81% | 2497 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,993 psi | 75% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,030 psi | 63% | 2352 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 38,377 psi | 60% | 2339 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 32,663 psi | 51% | 2260 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,301 psi | 82% | 2523 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,547 psi | 82% | 2520 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,964 psi | 75% | 2516 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,192 psi | 68% | 2474 fps | 95.6% |
| Norma MRP | <<locked>> | 88% | 36,680 psi | 57% | 2438 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,564 psi | 57% | 2356 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 47,790 psi | 75% | 2536 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,441 psi | 73% | 2598 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 35,331 psi | 55% | 2339 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 39,117 psi | 61% | 2441 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 44% | 1453 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,253 psi | 72% | 2470 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,880 psi | 81% | 2628 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,366 psi | 66% | 2520 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,230 psi | 57% | 2375 fps | 98.1% |
| ReloadSwiss RS 70 | 55.3 gr | 80% | 35,331 psi | 55% | 2375 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,740 psi | 61% | 2510 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 50,053 psi | 78% | 2484 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,830 psi | 69% | 2438 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 46,905 psi | 74% | 2507 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 41,278 psi | 65% | 2461 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,017 psi | 64% | 2365 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,030 psi | 63% | 2352 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,403 psi | 84% | 2549 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,993 psi | 75% | 2470 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,377 psi | 60% | 2339 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,961 psi | 69% | 2477 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,824 psi | 84% | 2575 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,184 psi | 80% | 2546 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,765 psi | 83% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,701 psi | 70% | 2343 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,073 psi | 61% | 2297 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 40,886 psi | 64% | 2457 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 52,678 psi | 83% | 2457 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,301 psi | 84% | 2562 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,990 psi | 69% | 2434 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 51,169 psi | 80% | 2546 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 33,272 psi | 52% | 2323 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 37,275 psi | 58% | 2352 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,069 psi | 83% | 2438 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,893 psi | 78% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,864 psi | 78% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,945 psi | 66% | 2369 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,724 psi | 59% | 2346 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 38,725 psi | 61% | 2375 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 48,254 psi | 76% | 2461 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,463 psi | 59% | 2356 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,443 psi | 46% | 2234 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 96% | 47,514 psi | 74% | 2631 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,883 psi | 58% | 2320 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 38,406 psi | 60% | 2395 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,192 psi | 38% | 2146 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,285 psi | 80% | 2556 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,336 psi | 65% | 2428 fps | 95.2% |
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 107 powders for 8 x 68 S loaded with the .323 | 220gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,795 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 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, Accurate High Country, 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8 x 68 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.