Load Specifications
Load data in caliber 8 x 68 S with .323 | 170gr | Hornady InterLock RN bullet and 98 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, 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.
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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 2015 | <<locked>> | 84% | 55,637 psi | 87% | 2897 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,595 psi | 90% | 2972 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,375 psi | 85% | 2920 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,144 psi | 88% | 2989 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,246 psi | 90% | 2972 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,437 psi | 65% | 2799 fps | 95.8% |
| Accurate 4064 | <<locked>> | 90% | 54,375 psi | 85% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,244 psi | 85% | 3054 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,853 psi | 86% | 3002 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,709 psi | 87% | 2999 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,305 psi | 90% | 3002 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,447 psi | 85% | 2923 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,331 psi | 85% | 3120 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,854 psi | 88% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,347 psi | 88% | 3045 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,463 psi | 87% | 3114 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,724 psi | 89% | 3153 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,726 psi | 62% | 2835 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,570 psi | 70% | 3002 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,636 psi | 86% | 3015 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 56,579 psi | 89% | 3041 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,594 psi | 89% | 3009 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,419 psi | 87% | 2933 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,782 psi | 89% | 3035 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,984 psi | 86% | 3081 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 57,537 psi | 90% | 3054 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 57,058 psi | 89% | 3104 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 57,682 psi | 90% | 3064 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 86% | 55,376 psi | 87% | 3015 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,677 psi | 81% | 2982 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,737 psi | 86% | 3045 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,201 psi | 85% | 3084 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 56% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,565 psi | 89% | 3015 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,361 psi | 87% | 2995 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,158 psi | 86% | 2982 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,201 psi | 87% | 2959 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3035 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,969 psi | 86% | 2986 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 3045 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 54,317 psi | 85% | 3025 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,305 psi | 90% | 3002 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,638 psi | 90% | 2986 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,447 psi | 85% | 2976 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,696 psi | 90% | 2976 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,172 psi | 86% | 2979 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,491 psi | 85% | 2979 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 55,216 psi | 87% | 3012 fps | 98% |
| Norma 201 | <<locked>> | 88% | 56,884 psi | 89% | 2995 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,595 psi | 90% | 2999 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,506 psi | 87% | 3031 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3097 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 56,347 psi | 88% | 3061 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,695 psi | 87% | 3091 fps | 98.7% |
| Ramshot TAC | <<locked>> | 86% | 57,624 psi | 90% | 3025 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,305 psi | 90% | 3041 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,621 psi | 86% | 2949 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,911 psi | 56% | 1886 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,536 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,317 psi | 85% | 2979 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,145 psi | 90% | 3120 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,492 psi | 89% | 3150 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,969 psi | 85% | 3074 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3163 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 54,549 psi | 85% | 2927 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,377 psi | 90% | 2992 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,449 psi | 88% | 3031 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,594 psi | 89% | 3009 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,491 psi | 85% | 2979 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,447 psi | 85% | 2976 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,172 psi | 86% | 2979 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,216 psi | 87% | 3012 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,462 psi | 85% | 3038 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,188 psi | 88% | 3002 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,753 psi | 89% | 3025 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,984 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,288 psi | 87% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,679 psi | 86% | 2930 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 54,984 psi | 86% | 2982 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,711 psi | 90% | 2927 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,753 psi | 87% | 2992 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,739 psi | 89% | 3028 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3041 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,781 psi | 86% | 2844 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,230 psi | 87% | 2867 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,188 psi | 90% | 2953 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,563 psi | 86% | 2923 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,650 psi | 86% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,840 psi | 88% | 3035 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 57,740 psi | 90% | 3002 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,391 psi | 88% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,752 psi | 86% | 3038 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,497 psi | 68% | 2913 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,304 psi | 88% | 3015 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,012 psi | 85% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,319 psi | 90% | 3107 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,563 psi | 56% | 2831 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,579 psi | 89% | 3031 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% | 49,095 psi | 77% | 2802 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,896 psi | 84% | 2920 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,916 psi | 66% | 2723 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,066 psi | 77% | 2881 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,050 psi | 74% | 2802 fps | 95.2% |
| Accurate 3100 | <<locked>> | 98% | 38,740 psi | 61% | 2743 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,624 psi | 62% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,301 psi | 52% | 2638 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 45,208 psi | 71% | 2835 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 38,435 psi | 60% | 2677 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,297 psi | 74% | 2844 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,906 psi | 75% | 2828 fps | 100% |
| Alliant Power Pro 2000-MR | 61.4 gr | 80% | 41,263 psi | 65% | 2867 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,189 psi | 60% | 2700 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,944 psi | 64% | 2766 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,591 psi | 53% | 2651 fps | 95% |
| Alliant Reloder-17 | 60.5 gr | 80% | 33,083 psi | 52% | 2667 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,922 psi | 48% | 2602 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,998 psi | 56% | 2799 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,556 psi | 70% | 2838 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 37,971 psi | 60% | 2707 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 46,818 psi | 73% | 2838 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,153 psi | 77% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,354 psi | 73% | 2867 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,155 psi | 80% | 3018 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 38,711 psi | 61% | 2707 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 43,729 psi | 69% | 2867 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 92% | 50,821 psi | 80% | 2949 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,672 psi | 72% | 2844 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,037 psi | 46% | 2493 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,742 psi | 65% | 2818 fps | 99.3% |
| Hodgdon Superformance | 73.5 gr | 92% | 46,905 psi | 74% | 2949 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 41% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,961 psi | 69% | 2799 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 45,498 psi | 71% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,364 psi | 63% | 2713 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,917 psi | 67% | 2733 fps | 95% |
| IMR 4350 | <<locked>> | 94% | 47,195 psi | 74% | 2867 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,716 psi | 72% | 2818 fps | 95.7% |
| IMR 4831 | <<locked>> | 86% | 34,650 psi | 54% | 2651 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,959 psi | 66% | 2799 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 47,297 psi | 74% | 2844 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,737 psi | 84% | 2930 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,570 psi | 70% | 2815 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,310 psi | 71% | 2769 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 40,451 psi | 63% | 2720 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,016 psi | 63% | 2710 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 42,989 psi | 67% | 2792 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 44,425 psi | 70% | 2789 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,730 psi | 70% | 2795 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,321 psi | 63% | 2753 fps | 98.4% |
| Norma URP | <<locked>> | 84% | 33,779 psi | 53% | 2644 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,972 psi | 63% | 2769 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 40,190 psi | 63% | 2799 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 47,224 psi | 74% | 2848 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,920 psi | 74% | 2871 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,039 psi | 80% | 2894 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 42% | 1686 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,142 psi | 83% | 2930 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,858 psi | 66% | 2749 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,221 psi | 68% | 2877 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,201 psi | 55% | 2740 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,447 psi | 56% | 2710 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,043 psi | 60% | 2779 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 48,472 psi | 76% | 2831 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,293 psi | 66% | 2736 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,621 psi | 56% | 2648 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 46,818 psi | 73% | 2838 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,016 psi | 63% | 2710 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,570 psi | 70% | 2815 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,451 psi | 63% | 2720 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 42,989 psi | 67% | 2792 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,550 psi | 57% | 2697 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,629 psi | 72% | 2822 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,787 psi | 69% | 2802 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,658 psi | 72% | 2736 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,029 psi | 60% | 2595 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,034 psi | 71% | 2762 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 51,329 psi | 80% | 2927 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,324 psi | 71% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,339 psi | 71% | 2818 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 36,506 psi | 57% | 2654 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 26,469 psi | 41% | 2470 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 51,503 psi | 81% | 2799 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,977 psi | 72% | 2726 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,756 psi | 65% | 2717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,308 psi | 66% | 2726 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,679 psi | 54% | 2585 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 35,186 psi | 55% | 2644 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,572 psi | 75% | 2841 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,857 psi | 64% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,606 psi | 54% | 2641 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 33,446 psi | 52% | 2687 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,719 psi | 48% | 2503 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 47,195 psi | 74% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,903 psi | 69% | 2871 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,254 psi | 46% | 2621 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,410 psi | 68% | 2808 fps | 99.3% |
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 98 powders for 8 x 68 S loaded with the .323 | 170gr | Hornady InterLock RN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,163 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.323" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8 x 68 S with the .323 | 170gr | Hornady InterLock RN 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.