Load Specifications
Load data in caliber 8 x 68 S with .323 | 150gr | Brenneke TUG Nature Plus bullet and 95 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, ReloadSwiss RS 60 and ReloadSwiss RS 52.
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>> | 88% | 54,969 psi | 86% | 3068 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 57,188 psi | 90% | 3146 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,086 psi | 88% | 3130 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,463 psi | 87% | 3156 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 55,680 psi | 87% | 3173 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,283 psi | 76% | 3117 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 82% | 54,491 psi | 85% | 3012 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,882 psi | 86% | 3038 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,244 psi | 85% | 3163 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 96% | 55,245 psi | 87% | 3156 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 82% | 55,390 psi | 87% | 3140 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 56,985 psi | 89% | 3173 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 57,043 psi | 89% | 3150 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,013 psi | 86% | 3235 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,853 psi | 84% | 3278 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,636 psi | 86% | 3179 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,636 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,492 psi | 87% | 3202 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,776 psi | 75% | 3130 fps | 97.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3304 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,566 psi | 90% | 3054 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,186 psi | 85% | 3173 fps | 98.7% |
| Bofors RP3 | <<locked>> | 96% | 55,013 psi | 86% | 3192 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,434 psi | 87% | 3100 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,130 psi | 88% | 3202 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,172 psi | 85% | 3241 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 84% | 54,070 psi | 85% | 3120 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,245 psi | 87% | 3146 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,797 psi | 89% | 3205 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 90% | 54,723 psi | 86% | 3176 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,700 psi | 68% | 2995 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 57,696 psi | 90% | 3264 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,592 psi | 54% | 1936 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,318 psi | 88% | 3179 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 57,725 psi | 90% | 3215 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,839 psi | 86% | 3140 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,332 psi | 87% | 3110 fps | 96.2% |
| IMR 4198 | <<locked>> | 84% | 55,216 psi | 87% | 3041 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,679 psi | 86% | 3130 fps | 96% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,151 psi | 72% | 3058 fps | 97.4% |
| IMR 4895 | <<locked>> | 94% | 56,898 psi | 89% | 3238 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 56,985 psi | 89% | 3173 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 57,261 psi | 90% | 3156 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 57,246 psi | 90% | 3192 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 57,653 psi | 90% | 3140 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 57,682 psi | 90% | 3189 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 3117 fps | 97.3% |
| Norma 201 | <<locked>> | 92% | 56,246 psi | 88% | 3159 fps | 100% |
| Norma 202 | <<locked>> | 92% | 56,724 psi | 89% | 3166 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,607 psi | 86% | 3186 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 48,283 psi | 76% | 3117 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 94% | 55,347 psi | 87% | 3215 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 57,740 psi | 90% | 3182 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,971 psi | 89% | 3205 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,868 psi | 86% | 3117 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,940 psi | 55% | 1985 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 56,768 psi | 89% | 3159 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 57,334 psi | 90% | 3182 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,724 psi | 87% | 3274 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,564 psi | 87% | 3310 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,269 psi | 76% | 3143 fps | 97.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,182 psi | 77% | 3166 fps | 96.9% |
| Rottweil R 901 | <<locked>> | 90% | 56,840 psi | 89% | 3143 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,521 psi | 89% | 3153 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,839 psi | 86% | 3179 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,345 psi | 84% | 3117 fps | 97.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 57,246 psi | 90% | 3192 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 57,682 psi | 90% | 3189 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,521 psi | 89% | 3123 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,580 psi | 90% | 2785 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,782 psi | 87% | 3150 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 57,232 psi | 90% | 3251 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,956 psi | 88% | 3104 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,796 psi | 87% | 3156 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,289 psi | 88% | 3186 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,042 psi | 86% | 3054 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,737 psi | 86% | 3045 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3068 fps | 96% |
| Somchem S321 | <<locked>> | 86% | 54,781 psi | 86% | 3153 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 57,421 psi | 90% | 3097 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,332 psi | 87% | 3150 fps | 99.4% |
| Somchem S355 | <<locked>> | 98% | 55,332 psi | 87% | 3179 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,728 psi | 67% | 3051 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 86% | 54,694 psi | 86% | 3022 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,114 psi | 86% | 3038 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,883 psi | 88% | 3120 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 57,508 psi | 90% | 3140 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3163 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 3117 fps | 98% |
| Vihtavuori N530 | <<locked>> | 88% | 54,114 psi | 85% | 3117 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 55,564 psi | 87% | 3133 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,937 psi | 78% | 3120 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3104 fps | 99.6% |
| Winchester 748 | <<locked>> | 90% | 57,377 psi | 90% | 3225 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,086 psi | 88% | 3192 fps | 99.8% |
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 2015 | <<locked>> | 80% | 42,540 psi | 67% | 2864 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,543 psi | 73% | 2976 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,606 psi | 54% | 2749 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,655 psi | 65% | 2917 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 32,750 psi | 51% | 2726 fps | 98.7% |
| Accurate 4350 | <<locked>> | 94% | 38,827 psi | 61% | 2923 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 51,314 psi | 80% | 2963 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,692 psi | 81% | 2989 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,276 psi | 62% | 2864 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 37,840 psi | 59% | 2812 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 51,822 psi | 81% | 3084 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,379 psi | 65% | 2887 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 40,495 psi | 63% | 2890 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,066 psi | 75% | 3107 fps | 99.1% |
| Alliant Power Pro 2000-MR | 62.9 gr | 84% | 40,683 psi | 64% | 3002 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,343 psi | 51% | 2710 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,298 psi | 76% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 37,536 psi | 59% | 2844 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 39,552 psi | 62% | 2943 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,301 psi | 54% | 2838 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,372 psi | 79% | 2949 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,232 psi | 60% | 2854 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 31,662 psi | 50% | 2707 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,323 psi | 68% | 2884 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,494 psi | 62% | 2894 fps | 98.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,584 psi | 68% | 3041 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 47,282 psi | 74% | 3009 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,124 psi | 75% | 3028 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,364 psi | 63% | 2897 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 39,595 psi | 62% | 2881 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,736 psi | 53% | 2766 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,520 psi | 56% | 2831 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,672 psi | 40% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,145 psi | 60% | 2831 fps | 96.9% |
| IMR 3031 | <<locked>> | 80% | 38,638 psi | 61% | 2890 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 37,362 psi | 59% | 2795 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 51,953 psi | 81% | 3054 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 49,023 psi | 77% | 2946 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,314 psi | 80% | 3071 fps | 95.2% |
| IMR 4831 | <<locked>> | 96% | 40,263 psi | 63% | 2936 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 35,940 psi | 56% | 2818 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 41,379 psi | 65% | 2887 fps | 98.4% |
| Lovex D073.5 | <<locked>> | 80% | 46,412 psi | 73% | 2979 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 37,652 psi | 59% | 2841 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 39,784 psi | 62% | 2808 fps | 96.9% |
| Lovex S062 | <<locked>> | 80% | 34,505 psi | 54% | 2736 fps | 96.7% |
| Lovex S065 | <<locked>> | 94% | 44,193 psi | 69% | 2946 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,189 psi | 60% | 2815 fps | 97.7% |
| Norma 202 | <<locked>> | 80% | 38,421 psi | 60% | 2835 fps | 99.4% |
| Norma 203B | <<locked>> | 80% | 34,476 psi | 54% | 2772 fps | 95.1% |
| Norma URP | <<locked>> | 94% | 39,465 psi | 62% | 2930 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 82% | 36,390 psi | 57% | 2835 fps | 95.5% |
| Ramshot TAC | <<locked>> | 82% | 44,222 psi | 69% | 2936 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,466 psi | 63% | 2897 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,962 psi | 70% | 2940 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,715 psi | 40% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,557 psi | 73% | 2989 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 46,891 psi | 73% | 2999 fps | 95% |
| ReloadSwiss RS 52 | 58.1 gr | 80% | 36,303 psi | 57% | 2884 fps | 95% |
| ReloadSwiss RS 60 | 59 gr | 80% | 29,907 psi | 47% | 2720 fps | 95.8% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 41,713 psi | 65% | 3009 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,757 psi | 67% | 3025 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 41,771 psi | 65% | 2877 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 36,260 psi | 57% | 2762 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 84% | 34,040 psi | 53% | 2762 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,193 psi | 69% | 2946 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,652 psi | 59% | 2841 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 34,505 psi | 54% | 2736 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,168 psi | 77% | 3002 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,766 psi | 86% | 2749 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,112 psi | 82% | 3091 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,578 psi | 56% | 2822 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,139 psi | 77% | 2999 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 42,148 psi | 66% | 2904 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,840 psi | 59% | 2828 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,987 psi | 63% | 2789 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,851 psi | 51% | 2635 fps | 99.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 50,546 psi | 79% | 3009 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 44,411 psi | 70% | 2966 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 39,392 psi | 62% | 2789 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 38,914 psi | 61% | 2841 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 32,953 psi | 52% | 2717 fps | 95.1% |
| Somchem S365 | <<locked>> | 90% | 30,748 psi | 48% | 2746 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 45,426 psi | 71% | 2874 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,205 psi | 63% | 2792 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,404 psi | 55% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,492 psi | 57% | 2766 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 29,327 psi | 46% | 2595 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 94% | 41,510 psi | 65% | 2936 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 41,278 psi | 65% | 2881 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 80% | 35,012 psi | 55% | 2746 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 94% | 40,611 psi | 64% | 2933 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,534 psi | 54% | 2736 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 40,451 psi | 63% | 2923 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,028 psi | 58% | 2828 fps | 96.7% |
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 95 powders for 8 x 68 S loaded with the .323 | 150gr | Brenneke TUG Nature Plus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,310 fps. Accurate 4350 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.323" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for 8 x 68 S with the .323 | 150gr | Brenneke TUG Nature Plus 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.