Load Specifications
Load data in caliber 8 x 68 S with .323 | 170gr | Speer Hot-Cor 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, 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 2015 | <<locked>> | 84% | 56,623 psi | 89% | 2917 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,564 psi | 87% | 2943 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,246 psi | 90% | 3012 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,447 psi | 85% | 2936 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,612 psi | 67% | 2828 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 55,521 psi | 87% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,506 psi | 87% | 3081 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,651 psi | 87% | 3022 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,652 psi | 89% | 3018 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,737 psi | 86% | 2972 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,521 psi | 87% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,521 psi | 87% | 3146 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,840 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,580 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3136 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,360 psi | 85% | 3120 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,596 psi | 64% | 2861 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,643 psi | 72% | 3035 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,564 psi | 87% | 3038 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 54,114 psi | 85% | 3009 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,682 psi | 90% | 3031 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,202 psi | 88% | 2949 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,172 psi | 85% | 3002 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,086 psi | 88% | 3104 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,969 psi | 86% | 3022 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 54,621 psi | 86% | 3074 fps | 98% |
| Hodgdon H4350 | <<locked>> | 94% | 55,114 psi | 86% | 3035 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 86% | 56,246 psi | 88% | 3031 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3002 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,014 psi | 88% | 3071 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,259 psi | 87% | 3110 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 56% | 1850 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,595 psi | 90% | 3035 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,391 psi | 88% | 3015 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,188 psi | 88% | 3005 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,086 psi | 88% | 2982 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 54,331 psi | 85% | 2999 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,057 psi | 88% | 3012 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 3068 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,347 psi | 87% | 3048 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,737 psi | 86% | 2972 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,535 psi | 87% | 2995 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,129 psi | 86% | 2946 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,217 psi | 88% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,332 psi | 87% | 3002 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 56,521 psi | 89% | 3041 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 54,592 psi | 86% | 2969 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,027 psi | 86% | 2966 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,753 psi | 89% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,129 psi | 86% | 3054 fps | 96.2% |
| Norma URP | <<locked>> | 98% | 54,578 psi | 86% | 3068 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 57,522 psi | 90% | 3084 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3117 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 54,955 psi | 86% | 2989 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,636 psi | 86% | 3009 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,332 psi | 87% | 2969 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,071 psi | 57% | 1896 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,638 psi | 90% | 3002 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,172 psi | 86% | 3002 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,447 psi | 85% | 3084 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,940 psi | 85% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,347 psi | 87% | 3100 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,679 psi | 86% | 3130 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,448 psi | 87% | 2949 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,027 psi | 86% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,464 psi | 90% | 3051 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,682 psi | 90% | 3031 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,332 psi | 87% | 3002 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,535 psi | 87% | 2995 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,217 psi | 88% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,521 psi | 89% | 3041 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,651 psi | 87% | 3061 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,130 psi | 90% | 3025 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,740 psi | 90% | 3048 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,854 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,318 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,709 psi | 87% | 2953 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 55,985 psi | 88% | 3005 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,405 psi | 87% | 2900 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,652 psi | 89% | 3012 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,740 psi | 90% | 3051 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3068 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,820 psi | 77% | 2940 fps | 96.1% |
| Vihtavuori N130 | <<locked>> | 82% | 55,506 psi | 87% | 2861 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,115 psi | 88% | 2884 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,853 psi | 86% | 2927 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,593 psi | 87% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,593 psi | 87% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,956 psi | 89% | 3058 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 55,056 psi | 86% | 2969 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,276 psi | 90% | 2989 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,028 psi | 88% | 3064 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,802 psi | 70% | 2943 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,377 psi | 90% | 3035 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,100 psi | 86% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,868 psi | 86% | 3077 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,405 psi | 57% | 2867 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,172 psi | 85% | 3002 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% | 50,053 psi | 78% | 2822 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,699 psi | 67% | 2743 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,908 psi | 78% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,703 psi | 75% | 2822 fps | 95.5% |
| Accurate 3100 | <<locked>> | 98% | 39,711 psi | 62% | 2769 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 40,335 psi | 63% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,229 psi | 54% | 2664 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 46,064 psi | 72% | 2858 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,218 psi | 61% | 2700 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,124 psi | 75% | 2864 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,718 psi | 76% | 2848 fps | 100% |
| Alliant Power Pro 2000-MR | 62.6 gr | 80% | 42,177 psi | 66% | 2894 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,015 psi | 61% | 2723 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,756 psi | 65% | 2789 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,214 psi | 54% | 2674 fps | 95.5% |
| Alliant Reloder-17 | 61.6 gr | 80% | 33,707 psi | 53% | 2690 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,733 psi | 47% | 2572 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,898 psi | 58% | 2828 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,440 psi | 71% | 2861 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 38,783 psi | 61% | 2730 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 44,875 psi | 70% | 2808 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,734 psi | 78% | 2851 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,369 psi | 74% | 2890 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,286 psi | 82% | 3041 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,508 psi | 62% | 2730 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 88% | 41,887 psi | 66% | 2835 fps | 95% |
| Hodgdon H4350 | <<locked>> | 90% | 48,646 psi | 76% | 2917 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 46,485 psi | 73% | 2867 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,544 psi | 46% | 2513 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,583 psi | 67% | 2838 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 90% | 44,541 psi | 70% | 2910 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,527 psi | 42% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,570 psi | 70% | 2815 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 46,311 psi | 73% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,191 psi | 65% | 2736 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,627 psi | 68% | 2756 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 45,208 psi | 71% | 2838 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,845 psi | 69% | 2789 fps | 95.3% |
| IMR 4831 | <<locked>> | 84% | 33,170 psi | 52% | 2621 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 42,801 psi | 67% | 2822 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 48,124 psi | 75% | 2864 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,469 psi | 71% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,890 psi | 72% | 2789 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 41,089 psi | 64% | 2740 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,305 psi | 60% | 2677 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 41,292 psi | 65% | 2762 fps | 95% |
| Norma 201 | <<locked>> | 80% | 45,063 psi | 71% | 2805 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,585 psi | 71% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,147 psi | 64% | 2779 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 51,590 psi | 81% | 2992 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 34,447 psi | 54% | 2664 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 40,886 psi | 64% | 2792 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 40,915 psi | 64% | 2822 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 48,109 psi | 75% | 2871 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,674 psi | 75% | 2890 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,011 psi | 82% | 2917 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 42% | 1696 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,041 psi | 85% | 2949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,511 psi | 67% | 2769 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,106 psi | 69% | 2900 fps | 98.8% |
| ReloadSwiss RS 60 | 61.6 gr | 80% | 35,853 psi | 56% | 2759 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,274 psi | 57% | 2736 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,856 psi | 61% | 2808 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 49,226 psi | 77% | 2851 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,975 psi | 67% | 2756 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,434 psi | 57% | 2671 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 44,875 psi | 70% | 2808 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,305 psi | 60% | 2677 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,469 psi | 71% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,089 psi | 64% | 2740 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 88% | 41,292 psi | 65% | 2762 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,304 psi | 58% | 2720 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,557 psi | 73% | 2848 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,527 psi | 70% | 2822 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,340 psi | 73% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,667 psi | 61% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,888 psi | 67% | 2726 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 52,301 psi | 82% | 2946 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,977 psi | 72% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,267 psi | 73% | 2841 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 37,101 psi | 58% | 2674 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 27,064 psi | 42% | 2497 fps | 95.8% |
| Somchem S385 | <<locked>> | 98% | 45,614 psi | 71% | 2881 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 52,214 psi | 82% | 2815 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,717 psi | 73% | 2746 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,482 psi | 67% | 2736 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,163 psi | 68% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,404 psi | 55% | 2608 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 82% | 33,678 psi | 53% | 2612 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 48,428 psi | 76% | 2864 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,597 psi | 65% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,418 psi | 56% | 2667 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 90% | 32,155 psi | 50% | 2654 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,372 psi | 49% | 2526 fps | 96.5% |
| Winchester 748 | <<locked>> | 80% | 48,312 psi | 76% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,887 psi | 66% | 2835 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,878 psi | 47% | 2654 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,164 psi | 69% | 2828 fps | 99.5% |
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 116 powders for 8 x 68 S loaded with the .323 | 170gr | Speer Hot-Cor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,146 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.323" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 | 170gr | Speer Hot-Cor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-22, Alliant Reloder-25, Bofors RP15 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.