Load Specifications
Load data in caliber 8 x 75 RS with .323 | 160gr | Geco STAR bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and ReloadSwiss RS 70.
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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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 49,182 psi | 89% | 2887 fps | 100% |
| Accurate 4064 | <<locked>> | 88% | 48,965 psi | 89% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 47,297 psi | 86% | 2972 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 84% | 49,095 psi | 89% | 2940 fps | 99% |
| ADI AR 2208 | <<locked>> | 88% | 47,065 psi | 85% | 2884 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 48,080 psi | 87% | 2890 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 82% | 48,283 psi | 88% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 47,819 psi | 87% | 3035 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 49,690 psi | 90% | 2963 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 86% | 47,369 psi | 86% | 2927 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 98% | 48,892 psi | 89% | 3028 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 94% | 49,705 psi | 90% | 3071 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,710 psi | 68% | 2805 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 48,312 psi | 88% | 2943 fps | 98.1% |
| Bofors RP3 | <<locked>> | 88% | 47,123 psi | 86% | 2927 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 47,152 psi | 86% | 2920 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 88% | 47,892 psi | 87% | 2927 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 84% | 49,501 psi | 90% | 2953 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,269 psi | 88% | 2959 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 48,138 psi | 87% | 2976 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 64% | 1864 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 47,398 psi | 86% | 2897 fps | 99.1% |
| IMR 3031 | <<locked>> | 84% | 49,052 psi | 89% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 49,487 psi | 90% | 2923 fps | 98.7% |
| IMR 4831 | <<locked>> | 98% | 47,979 psi | 87% | 2966 fps | 98% |
| IMR 4895 | <<locked>> | 86% | 48,457 psi | 88% | 2959 fps | 99% |
| IMR 8208 XBR | <<locked>> | 82% | 48,080 psi | 87% | 2890 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 84% | 48,399 psi | 88% | 2920 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 48,892 psi | 89% | 2867 fps | 99% |
| Lovex S062 | <<locked>> | 88% | 49,501 psi | 90% | 2927 fps | 99.7% |
| Lovex S065 | <<locked>> | 94% | 48,646 psi | 88% | 2910 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 48,269 psi | 88% | 2894 fps | 99.6% |
| Norma 202 | <<locked>> | 84% | 48,544 psi | 88% | 2904 fps | 100% |
| Norma 203B | <<locked>> | 88% | 49,472 psi | 90% | 2969 fps | 99.1% |
| Norma URP | <<locked>> | 98% | 49,661 psi | 90% | 3015 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 88% | 49,472 psi | 90% | 2989 fps | 99% |
| Ramshot Hunter | <<locked>> | 98% | 48,878 psi | 89% | 3005 fps | 96.3% |
| Ramshot TAC | <<locked>> | 82% | 48,167 psi | 87% | 2894 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 47,674 psi | 87% | 2920 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,926 psi | 65% | 1906 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 46,659 psi | 85% | 2982 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 49,385 psi | 90% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 46,630 psi | 85% | 2986 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 47,007 psi | 85% | 3002 fps | 96.8% |
| Rottweil R 901 | <<locked>> | 82% | 49,763 psi | 90% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 48,762 psi | 88% | 2890 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 90% | 46,949 psi | 85% | 2913 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 48,646 psi | 88% | 2910 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 48,399 psi | 88% | 2920 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 49,501 psi | 90% | 2927 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 48,008 psi | 87% | 2969 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 46,644 psi | 85% | 2867 fps | 96.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 47,485 psi | 86% | 2907 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 49,676 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 49,545 psi | 90% | 2838 fps | 100% |
| Somchem S335 | <<locked>> | 84% | 49,139 psi | 89% | 2841 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 49,313 psi | 89% | 2923 fps | 99% |
| Somchem S355 | <<locked>> | 90% | 47,659 psi | 86% | 2917 fps | 99.1% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,718 psi | 87% | 3025 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 84% | 49,777 psi | 90% | 2831 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 48,138 psi | 87% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 48,660 psi | 88% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 48,544 psi | 88% | 2897 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 96% | 48,950 psi | 89% | 2959 fps | 97.9% |
| Vihtavuori N530 | <<locked>> | 82% | 48,312 psi | 88% | 2890 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 86% | 47,094 psi | 85% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 48,196 psi | 87% | 2963 fps | 97.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,611 psi | 74% | 2890 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 49,458 psi | 90% | 2940 fps | 99.5% |
| Winchester 748 | <<locked>> | 82% | 47,688 psi | 87% | 2936 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 46,920 psi | 85% | 2910 fps | 99.1% |
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 2495 | <<locked>> | 80% | 40,857 psi | 74% | 2743 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,580 psi | 70% | 2730 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 38,812 psi | 70% | 2799 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 43,526 psi | 79% | 2831 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,912 psi | 67% | 2667 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,411 psi | 82% | 2841 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 45,266 psi | 82% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,233 psi | 71% | 2841 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,695 psi | 67% | 2697 fps | 97.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,421 psi | 72% | 2762 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,638 psi | 70% | 2802 fps | 95.5% |
| Alliant Reloder-17 | 58.9 gr | 82% | 33,866 psi | 61% | 2707 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,562 psi | 61% | 2694 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,293 psi | 77% | 2822 fps | 96.7% |
| Bofors RP3 | <<locked>> | 80% | 36,347 psi | 66% | 2700 fps | 97.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,092 psi | 80% | 2861 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 82% | 39,595 psi | 72% | 2753 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 43,845 psi | 80% | 2844 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 33,620 psi | 61% | 2641 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,610 psi | 72% | 2805 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 48% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,930 psi | 76% | 2789 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 43,091 psi | 78% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,725 psi | 70% | 2703 fps | 96.4% |
| IMR 4831 | <<locked>> | 90% | 37,333 psi | 68% | 2746 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 40,292 psi | 73% | 2795 fps | 97.4% |
| IMR 8208 XBR | <<locked>> | 80% | 45,411 psi | 82% | 2841 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 42,569 psi | 77% | 2815 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 43,555 psi | 79% | 2766 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 39,001 psi | 71% | 2720 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 43,395 psi | 79% | 2805 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,960 psi | 78% | 2789 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 42,946 psi | 78% | 2799 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 38,754 psi | 70% | 2749 fps | 97% |
| Norma URP | <<locked>> | 90% | 38,740 psi | 70% | 2792 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 37,927 psi | 69% | 2753 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 96% | 45,759 psi | 83% | 2943 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,194 psi | 82% | 2835 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,643 psi | 81% | 2861 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 49% | 1706 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,625 psi | 74% | 2858 fps | 96.8% |
| ReloadSwiss RS 60 | 57.4 gr | 80% | 33,620 psi | 61% | 2717 fps | 98% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,973 psi | 74% | 2867 fps | 95.9% |
| ReloadSwiss RS 70 | 68.5 gr | 94% | 43,976 psi | 80% | 2936 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 47,007 psi | 85% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,930 psi | 74% | 2740 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 34,447 psi | 63% | 2644 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,395 psi | 79% | 2805 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,569 psi | 77% | 2815 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 39,001 psi | 71% | 2720 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,896 psi | 63% | 2680 fps | 95.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,656 psi | 79% | 2808 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,771 psi | 76% | 2792 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,077 psi | 80% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,651 psi | 67% | 2602 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 43,801 psi | 79% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,149 psi | 78% | 2808 fps | 97.9% |
| Somchem S355 | <<locked>> | 80% | 35,259 psi | 64% | 2651 fps | 96.4% |
| Somchem S365 | <<locked>> | 84% | 29,182 psi | 53% | 2575 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 44,135 psi | 80% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,045 psi | 73% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,596 psi | 74% | 2730 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 33,417 psi | 61% | 2585 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 88% | 38,043 psi | 69% | 2736 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 45,339 psi | 82% | 2835 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 39,044 psi | 71% | 2713 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 39,885 psi | 72% | 2795 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 35,868 psi | 65% | 2779 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,852 psi | 61% | 2605 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 44,701 psi | 81% | 2881 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,176 psi | 75% | 2795 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 95 powders for 8 x 75 RS loaded with the .323 | 160gr | Geco STAR. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,077 fps. Accurate 3100 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 (380 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.323" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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. ReloadSwiss RS 60, Alliant Reloder-17, ReloadSwiss RS 70 rank at the top here: for 8 x 75 RS with the .323 | 160gr | Geco STAR they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, ADI AR 2209 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.