Load Specifications
Load data in caliber 8 x 68 S with .323 | 139gr | Geco ZERO bullet and 96 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 52 and Hodgdon LEVERevolution.
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>> | 90% | 56,565 psi | 89% | 3205 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,913 psi | 89% | 3320 fps | 98.7% |
| Accurate 2460 | <<locked>> | 86% | 55,332 psi | 87% | 3232 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 53,708 psi | 84% | 3212 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,347 psi | 87% | 3278 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,347 psi | 87% | 3278 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 57,392 psi | 90% | 3310 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,137 psi | 72% | 3179 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 56,507 psi | 89% | 3156 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,927 psi | 89% | 3182 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,999 psi | 88% | 3301 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 98% | 57,000 psi | 89% | 3291 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 84% | 57,508 psi | 90% | 3287 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,114 psi | 86% | 3255 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 90% | 54,853 psi | 86% | 3241 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 56,768 psi | 89% | 3379 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,724 psi | 87% | 3419 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,159 psi | 88% | 3310 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,507 psi | 89% | 3222 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 57,334 psi | 90% | 3340 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,195 psi | 72% | 3196 fps | 96.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 3376 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,869 psi | 88% | 3143 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,057 psi | 88% | 3310 fps | 98.5% |
| Bofors RP3 | <<locked>> | 98% | 56,956 psi | 89% | 3333 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,464 psi | 90% | 3245 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,288 psi | 85% | 3281 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,144 psi | 88% | 3386 fps | 99% |
| Hodgdon H322 | <<locked>> | 88% | 54,897 psi | 86% | 3248 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,782 psi | 89% | 3284 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,839 psi | 86% | 3281 fps | 97.7% |
| Hodgdon H4198 | <<locked>> | 82% | 54,868 psi | 86% | 3156 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 56,478 psi | 89% | 3317 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,163 psi | 66% | 3061 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,376 psi | 87% | 3340 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,258 psi | 54% | 2014 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 56,623 psi | 89% | 3294 fps | 99.5% |
| IMR 3031 | <<locked>> | 96% | 57,392 psi | 90% | 3330 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 55,361 psi | 87% | 3258 fps | 98.9% |
| IMR 4198 | <<locked>> | 86% | 56,869 psi | 89% | 3186 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 54,882 psi | 86% | 3317 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 90% | 55,114 psi | 86% | 3255 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 86% | 55,376 psi | 87% | 3241 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,085 psi | 86% | 3274 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,159 psi | 88% | 3228 fps | 99.2% |
| Lovex S062 | <<locked>> | 96% | 55,753 psi | 87% | 3271 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 3189 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 56,014 psi | 88% | 3189 fps | 100% |
| Norma 201 | <<locked>> | 92% | 54,273 psi | 85% | 3238 fps | 99.7% |
| Norma 202 | <<locked>> | 92% | 54,984 psi | 86% | 3251 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,362 psi | 88% | 3327 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 46,369 psi | 73% | 3182 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 96% | 57,334 psi | 90% | 3356 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 56,072 psi | 88% | 3261 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,230 psi | 87% | 3287 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,797 psi | 89% | 3258 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,548 psi | 54% | 2060 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,955 psi | 86% | 3245 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,434 psi | 87% | 3255 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 57,435 psi | 90% | 3415 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3455 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,267 psi | 73% | 3202 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 90% | 55,114 psi | 86% | 3228 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,781 psi | 86% | 3235 fps | 99.7% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3317 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,590 psi | 81% | 3189 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,085 psi | 86% | 3274 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,753 psi | 87% | 3271 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,940 psi | 86% | 3209 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,333 psi | 88% | 2884 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,969 psi | 85% | 3235 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,085 psi | 86% | 3327 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 57,580 psi | 90% | 3248 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,998 psi | 85% | 3232 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,360 psi | 85% | 3264 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,768 psi | 89% | 3192 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,652 psi | 89% | 3182 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 56,666 psi | 89% | 3294 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 55,579 psi | 87% | 3182 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 57,276 psi | 90% | 3291 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3314 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,031 psi | 64% | 3114 fps | 98.4% |
| Unknown powderᴾ | <<locked>> | 100% | 50,879 psi | 80% | 3255 fps | 96.8% |
| Vihtavuori N120 | <<locked>> | 82% | 57,667 psi | 90% | 3117 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 56,478 psi | 89% | 3163 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,710 psi | 89% | 3179 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 57,479 psi | 90% | 3261 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,622 psi | 87% | 3225 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,390 psi | 87% | 3241 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,834 psi | 77% | 3182 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 90% | 55,767 psi | 87% | 3255 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 57,580 psi | 90% | 3274 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,964 psi | 75% | 3182 fps | 96.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,328 psi | 79% | 3173 fps | 99% |
| Winchester 748 | <<locked>> | 88% | 56,072 psi | 88% | 3317 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,275 psi | 88% | 3307 fps | 99.6% |
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% | 41,002 psi | 64% | 2940 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,069 psi | 83% | 3251 fps | 98.2% |
| Accurate 2460 | <<locked>> | 80% | 44,773 psi | 70% | 3048 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 33,228 psi | 52% | 2815 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 38,638 psi | 61% | 2963 fps | 98.6% |
| Accurate 2520 | <<locked>> | 80% | 38,638 psi | 61% | 2963 fps | 98.6% |
| Accurate 4064 | <<locked>> | 80% | 31,415 psi | 49% | 2789 fps | 97.7% |
| Accurate 4350 | <<locked>> | 98% | 42,946 psi | 67% | 3114 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 49,821 psi | 78% | 3048 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,183 psi | 79% | 3071 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 37,753 psi | 59% | 2927 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 86% | 38,986 psi | 61% | 2936 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 49,995 psi | 78% | 3169 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,842 psi | 62% | 2953 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 38,914 psi | 61% | 2972 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,122 psi | 72% | 3179 fps | 98.2% |
| Alliant Power Pro 2000-MR | 65.9 gr | 86% | 42,163 psi | 66% | 3133 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,578 psi | 56% | 2894 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,673 psi | 73% | 3064 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 38,537 psi | 60% | 2966 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 98% | 43,352 psi | 68% | 3130 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 90% | 38,000 psi | 60% | 3031 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,979 psi | 77% | 3035 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,438 psi | 67% | 3051 fps | 95.6% |
| Bofors RP3 | <<locked>> | 84% | 34,925 psi | 55% | 2890 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,047 psi | 66% | 2963 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,072 psi | 60% | 2963 fps | 97.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,916 psi | 66% | 3107 fps | 96.1% |
| Hodgdon H322 | <<locked>> | 80% | 42,366 psi | 66% | 3025 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 80% | 49,400 psi | 77% | 3163 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 44,483 psi | 70% | 3084 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 80% | 51,459 psi | 81% | 3100 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 38,043 psi | 60% | 2943 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,941 psi | 58% | 2936 fps | 95.6% |
| Hodgdon LEVERevolution | 60.3 gr | 82% | 34,447 psi | 54% | 2897 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,396 psi | 40% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 36,361 psi | 57% | 2884 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 33,750 psi | 53% | 2877 fps | 99.3% |
| IMR 4064 | <<locked>> | 88% | 40,538 psi | 64% | 2969 fps | 95.8% |
| IMR 4198 | <<locked>> | 80% | 47,442 psi | 74% | 3035 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 36,970 psi | 58% | 2943 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 39,842 psi | 62% | 2953 fps | 97.4% |
| Lovex D073.5 | <<locked>> | 80% | 44,599 psi | 70% | 3048 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 36,114 psi | 57% | 2904 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 38,667 psi | 61% | 2877 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 33,315 psi | 52% | 2802 fps | 95.4% |
| Lovex S065 | <<locked>> | 98% | 48,443 psi | 76% | 3130 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 52,562 psi | 82% | 3136 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,927 psi | 58% | 2884 fps | 96.7% |
| Norma 202 | <<locked>> | 80% | 37,086 psi | 58% | 2904 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 37,869 psi | 59% | 2953 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 43,236 psi | 68% | 3114 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 84% | 37,681 psi | 59% | 2966 fps | 95.1% |
| Ramshot TAC | <<locked>> | 84% | 45,876 psi | 72% | 3071 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,044 psi | 61% | 2963 fps | 95.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,381 psi | 68% | 3005 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,585 psi | 40% | 1847 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,005 psi | 71% | 3064 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 51,837 psi | 81% | 3192 fps | 95.5% |
| ReloadSwiss RS 52 | 62.4 gr | 84% | 40,147 psi | 63% | 3077 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 30,922 psi | 48% | 2838 fps | 95.3% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 43,120 psi | 68% | 3136 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 40,509 psi | 63% | 2953 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 80% | 35,085 psi | 55% | 2828 fps | 96% |
| Rottweil R 903 | <<locked>> | 86% | 35,027 psi | 55% | 2884 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 48,443 psi | 76% | 3130 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,114 psi | 57% | 2904 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 33,315 psi | 52% | 2802 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,688 psi | 75% | 3081 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,403 psi | 84% | 2844 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,488 psi | 79% | 3176 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 39,276 psi | 62% | 3012 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,456 psi | 74% | 3087 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 43,511 psi | 68% | 3031 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 39,044 psi | 61% | 2953 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,653 psi | 61% | 2861 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,662 psi | 50% | 2700 fps | 98.4% |
| Somchem S321 | <<locked>> | 80% | 42,873 psi | 67% | 3041 fps | 98.4% |
| Somchem S335 | <<locked>> | 80% | 38,189 psi | 60% | 2864 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 37,536 psi | 59% | 2907 fps | 95.2% |
| Somchem S355 | <<locked>> | 86% | 36,143 psi | 57% | 2897 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 33,707 psi | 53% | 2920 fps | 96% |
| Unknown powder | <<locked>> | 96% | 44,701 psi | 70% | 3133 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 54,346 psi | 85% | 3071 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,961 psi | 69% | 2959 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,827 psi | 61% | 2867 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,939 psi | 53% | 2828 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 35,041 psi | 55% | 2831 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 32,285 psi | 51% | 2769 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 96% | 42,801 psi | 67% | 3061 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 39,856 psi | 62% | 2949 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 33,750 psi | 53% | 2812 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 98% | 44,759 psi | 70% | 3120 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,781 psi | 56% | 2858 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 42,018 psi | 66% | 3061 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,976 psi | 70% | 3104 fps | 98.1% |
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 114 powders for 8 x 68 S loaded with the .323 | 139gr | Geco ZERO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,455 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,455 fps. Accurate 4350 gives the best case fill at 100 %, and 114 of the 114 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.323" calls for a 1:14.5 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 52, Hodgdon LEVERevolution rank at the top here: for 8 x 68 S with the .323 | 139gr | Geco ZERO they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 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.