Load Specifications
Bullet:.323 | 180gr | Hornady GMX
Bullet Manufacturer:Hornady
Bullet Weight:180 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 | 180gr | Hornady GMX bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, 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.
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>> | 86% | 55,927 psi | 88% | 2799 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,360 psi | 85% | 2828 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,725 psi | 90% | 2867 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,463 psi | 88% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,682 psi | 90% | 2874 fps | 97.4% |
| Accurate 4064 | <<locked>> | 94% | 57,609 psi | 90% | 2917 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 2949 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 55,114 psi | 86% | 2907 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,333 psi | 88% | 2904 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,331 psi | 85% | 2858 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,810 psi | 86% | 2828 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,999 psi | 88% | 2963 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,013 psi | 86% | 3028 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,014 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,434 psi | 87% | 2802 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,753 psi | 89% | 2949 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 2956 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,174 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,912 psi | 58% | 2684 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,017 psi | 64% | 2835 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,158 psi | 86% | 2923 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 56,579 psi | 89% | 2940 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,971 psi | 89% | 2910 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,101 psi | 88% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,101 psi | 89% | 2940 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,550 psi | 87% | 2989 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 55,013 psi | 86% | 2851 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,101 psi | 88% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,099 psi | 85% | 2900 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3005 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 96% | 54,389 psi | 85% | 2910 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 88% | 55,680 psi | 87% | 2917 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,109 psi | 75% | 2828 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,056 psi | 86% | 2949 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,636 psi | 86% | 2989 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,114 psi | 55% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,305 psi | 90% | 2923 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,434 psi | 87% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,782 psi | 87% | 2887 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,854 psi | 88% | 2867 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 55,840 psi | 88% | 2762 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,490 psi | 84% | 2881 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,550 psi | 87% | 2890 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,082 psi | 80% | 2890 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 54,694 psi | 86% | 2930 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,331 psi | 85% | 2858 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,186 psi | 85% | 2838 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,636 psi | 86% | 2877 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,868 psi | 86% | 2831 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 55,230 psi | 87% | 2881 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,592 psi | 86% | 2884 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 2917 fps | 98.1% |
| Norma 201 | <<locked>> | 90% | 57,058 psi | 89% | 2897 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,447 psi | 85% | 2854 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,883 psi | 88% | 2936 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 2930 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2940 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 56,739 psi | 89% | 2966 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,156 psi | 82% | 2936 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 54,737 psi | 86% | 2877 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,085 psi | 85% | 2894 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,216 psi | 87% | 2858 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,418 psi | 56% | 1795 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,508 psi | 90% | 2890 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,462 psi | 85% | 2881 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,290 psi | 90% | 3018 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,913 psi | 89% | 3051 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2972 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3002 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 54,476 psi | 85% | 2828 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,711 psi | 90% | 2894 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,159 psi | 88% | 2927 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,971 psi | 89% | 2910 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,592 psi | 86% | 2884 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,636 psi | 86% | 2877 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,230 psi | 87% | 2881 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 2917 fps | 98.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,087 psi | 89% | 2861 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,607 psi | 86% | 2940 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,811 psi | 89% | 2831 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,695 psi | 89% | 2907 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,203 psi | 90% | 2930 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,506 psi | 87% | 2789 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,666 psi | 87% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,013 psi | 86% | 2835 fps | 97.7% |
| Somchem S321 | <<locked>> | 84% | 55,463 psi | 87% | 2890 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,650 psi | 86% | 2785 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,304 psi | 88% | 2900 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,840 psi | 89% | 2930 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,384 psi | 74% | 2887 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,303 psi | 87% | 2749 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,738 psi | 87% | 2772 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,493 psi | 90% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,955 psi | 86% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,665 psi | 86% | 2854 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 2936 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 54,723 psi | 86% | 2858 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,594 psi | 89% | 2874 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2940 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,900 psi | 63% | 2756 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,739 psi | 89% | 2920 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,679 psi | 86% | 2907 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3009 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,808 psi | 51% | 2664 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,145 psi | 90% | 2936 fps | 100% |
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% | 46,325 psi | 73% | 2664 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,807 psi | 80% | 2776 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,435 psi | 60% | 2575 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,818 psi | 72% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,384 psi | 74% | 2710 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 36,361 psi | 57% | 2569 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 32,721 psi | 51% | 2546 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 42,699 psi | 67% | 2690 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 36,230 psi | 57% | 2539 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,846 psi | 70% | 2703 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 44,889 psi | 70% | 2690 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,489 psi | 82% | 2910 fps | 100% |
| Alliant Power Pro 2000-MR | 56.7 gr | 80% | 38,754 psi | 61% | 2717 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,621 psi | 56% | 2559 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,243 psi | 82% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,435 psi | 60% | 2625 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,533 psi | 53% | 2562 fps | 95.2% |
| Alliant Reloder-17 | 55.8 gr | 80% | 30,719 psi | 48% | 2520 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,574 psi | 48% | 2513 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,447 psi | 56% | 2700 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,814 psi | 66% | 2694 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 35,085 psi | 55% | 2559 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 46,934 psi | 74% | 2746 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,659 psi | 73% | 2694 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,482 psi | 68% | 2723 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,095 psi | 75% | 2867 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 51,300 psi | 80% | 2799 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,228 psi | 82% | 2825 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,158 psi | 57% | 2566 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 92% | 43,729 psi | 69% | 2776 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 47,761 psi | 75% | 2799 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 43,076 psi | 68% | 2703 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,587 psi | 45% | 2402 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,088 psi | 61% | 2674 fps | 99% |
| Hodgdon Superformance | <<locked>> | 94% | 47,065 psi | 74% | 2858 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,020 psi | 41% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,394 psi | 65% | 2657 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 42,583 psi | 67% | 2700 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,014 psi | 60% | 2572 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,453 psi | 68% | 2651 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 52,605 psi | 82% | 2720 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 47,195 psi | 74% | 2772 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,236 psi | 68% | 2677 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 34,055 psi | 53% | 2559 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 39,363 psi | 62% | 2654 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,846 psi | 70% | 2703 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 50,604 psi | 79% | 2785 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,452 psi | 65% | 2667 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,091 psi | 68% | 2635 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 37,913 psi | 59% | 2579 fps | 99% |
| Lovex S065 | <<locked>> | 88% | 39,755 psi | 62% | 2618 fps | 95.8% |
| Lovex S070 | <<locked>> | 92% | 42,830 psi | 67% | 2700 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 41,568 psi | 65% | 2641 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 41,959 psi | 66% | 2651 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,782 psi | 59% | 2612 fps | 97.9% |
| Norma 204 | <<locked>> | 98% | 50,662 psi | 79% | 2871 fps | 95% |
| Norma URP | <<locked>> | 86% | 33,446 psi | 52% | 2552 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 37,376 psi | 59% | 2625 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 39,972 psi | 63% | 2707 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,831 psi | 70% | 2707 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,063 psi | 69% | 2726 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,486 psi | 76% | 2753 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,382 psi | 41% | 1604 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,256 psi | 79% | 2782 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,872 psi | 66% | 2661 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,176 psi | 63% | 2726 fps | 98% |
| ReloadSwiss RS 60 | 55.8 gr | 80% | 32,750 psi | 51% | 2589 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,056 psi | 55% | 2621 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,130 psi | 60% | 2694 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 45,353 psi | 71% | 2684 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,624 psi | 62% | 2595 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 32,895 psi | 52% | 2500 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 46,934 psi | 74% | 2746 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,755 psi | 62% | 2618 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,452 psi | 65% | 2667 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,913 psi | 59% | 2579 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 42,830 psi | 67% | 2700 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,316 psi | 84% | 2808 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,055 psi | 53% | 2552 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,229 psi | 83% | 2782 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,888 psi | 67% | 2677 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,176 psi | 65% | 2657 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,236 psi | 68% | 2602 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,795 psi | 56% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,976 psi | 70% | 2671 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 48,298 psi | 76% | 2779 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,670 psi | 67% | 2598 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,540 psi | 67% | 2674 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 33,866 psi | 53% | 2510 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 26,020 psi | 41% | 2382 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 48,965 psi | 77% | 2664 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,584 psi | 68% | 2595 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,015 psi | 61% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,755 psi | 62% | 2589 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,213 psi | 50% | 2448 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 35,027 psi | 55% | 2556 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 44,889 psi | 70% | 2700 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 38,348 psi | 60% | 2579 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,287 psi | 54% | 2556 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 32,590 psi | 51% | 2589 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,660 psi | 45% | 2365 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 44,454 psi | 70% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 43,729 psi | 69% | 2776 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,676 psi | 48% | 2595 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,640 psi | 64% | 2664 fps | 99% |
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 121 powders for 8 x 68 S loaded with the .323 | 180gr | Hornady GMX. Alliant Reloder-17 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,054 fps. Accurate 3100 gives the best case fill at 100 %, and 121 of the 121 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.323" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, 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 Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 8 x 68 S with the .323 | 180gr | Hornady GMX they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.