Load Specifications
Load data in caliber 8 x 60 RS with .323 | 139gr | Geco ZERO bullet and 40 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp and Lovex D073.6.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 43,656 psi | 89% | 2822 fps | 99.6% |
| Accurate 2460 | <<locked>> | 88% | 41,858 psi | 85% | 2805 fps | 97.2% |
| Accurate 2495ᴾ | <<locked>> | 100% | 43,947 psi | 89% | 2894 fps | 99.8% |
| Accurate 2520 | <<locked>> | 92% | 42,047 psi | 85% | 2848 fps | 96.9% |
| Accurate 4064ᴾ | <<locked>> | 100% | 40,828 psi | 83% | 2854 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 84% | 43,816 psi | 89% | 2743 fps | 98.8% |
| Accurate LT-32 | <<locked>> | 84% | 44,251 psi | 90% | 2749 fps | 97.3% |
| ADI AR 2207 | <<locked>> | 82% | 43,497 psi | 88% | 2789 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 44,541 psi | 90% | 2884 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 94% | 43,076 psi | 87% | 2897 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 44,135 psi | 90% | 2848 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 42,119 psi | 85% | 2723 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 43,207 psi | 88% | 2782 fps | 95.8% |
| Hodgdon BL-C2 | <<locked>> | 94% | 43,105 psi | 87% | 2884 fps | 95.8% |
| Hodgdon H322 | <<locked>> | 88% | 43,134 psi | 87% | 2858 fps | 98.6% |
| Hodgdon H335 | <<locked>> | 88% | 44,179 psi | 90% | 2877 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,518 psi | 66% | 1811 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 43,758 psi | 89% | 2933 fps | 99.3% |
| IMR 4198 | <<locked>> | 86% | 43,207 psi | 88% | 2785 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 42,076 psi | 85% | 2815 fps | 96.6% |
| Lovex D073.6 | <<locked>> | 96% | 43,076 psi | 87% | 2881 fps | 97.1% |
| Norma 200 | <<locked>> | 84% | 44,063 psi | 89% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 96% | 44,541 psi | 90% | 2881 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,300 psi | 66% | 1850 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 42,960 psi | 87% | 2825 fps | 96.6% |
| Rottweil R 901 | <<locked>> | 92% | 42,641 psi | 86% | 2812 fps | 97.4% |
| Shooters World AR Plus | <<locked>> | 82% | 42,076 psi | 85% | 2815 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 96% | 43,076 psi | 87% | 2881 fps | 97.1% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 42,076 psi | 85% | 2825 fps | 97.4% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 42,308 psi | 86% | 2805 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 42,003 psi | 85% | 2740 fps | 97.4% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 43,410 psi | 88% | 2779 fps | 98.6% |
| Somchem S335 | <<locked>> | 94% | 43,540 psi | 88% | 2792 fps | 98.5% |
| Vihtavuori N120 | <<locked>> | 82% | 43,598 psi | 88% | 2746 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 42,134 psi | 85% | 2749 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 94% | 44,280 psi | 90% | 2799 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 98% | 42,264 psi | 86% | 2848 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 96% | 42,206 psi | 86% | 2812 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 98% | 43,352 psi | 88% | 2848 fps | 97.6% |
| Winchester 748 | <<locked>> | 94% | 44,295 psi | 90% | 2913 fps | 96.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 29,559 psi | 60% | 2503 fps | 96.5% |
| Accurate 2460 | <<locked>> | 84% | 36,463 psi | 74% | 2690 fps | 95.7% |
| Accurate 2495 | <<locked>> | 86% | 26,847 psi | 54% | 2500 fps | 95.8% |
| Accurate 2520 | <<locked>> | 88% | 36,477 psi | 74% | 2730 fps | 95.2% |
| Accurate 4064 | <<locked>> | 94% | 33,388 psi | 68% | 2687 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 38,740 psi | 79% | 2638 fps | 97.8% |
| Accurate LT-32 | <<locked>> | 80% | 39,102 psi | 79% | 2644 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 80% | 41,017 psi | 83% | 2743 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 36,158 psi | 73% | 2707 fps | 96.9% |
| Alliant AR-Comp | 41 gr | 80% | 27,064 psi | 55% | 2513 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 34,171 psi | 69% | 2635 fps | 98.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,883 psi | 75% | 2618 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 40,712 psi | 83% | 2730 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 92% | 40,205 psi | 82% | 2825 fps | 95% |
| Hodgdon H322 | <<locked>> | 80% | 33,054 psi | 67% | 2628 fps | 95.8% |
| Hodgdon H335 | <<locked>> | 82% | 35,824 psi | 73% | 2697 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,830 psi | 48% | 1617 fps | 100% |
| IMR 3031 | 43 gr | 84% | 29,443 psi | 60% | 2589 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 35,926 psi | 73% | 2635 fps | 99.6% |
| Lovex D073.4 | <<locked>> | 80% | 39,189 psi | 79% | 2756 fps | 95.7% |
| Lovex D073.6 | 50.3 gr | 92% | 37,362 psi | 76% | 2762 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 38,595 psi | 78% | 2720 fps | 99.8% |
| Norma 202 | <<locked>> | 88% | 34,272 psi | 70% | 2661 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,772 psi | 48% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 37,536 psi | 76% | 2710 fps | 95% |
| Rottweil R 901 | <<locked>> | 86% | 35,549 psi | 72% | 2654 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 39,189 psi | 79% | 2756 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 92% | 37,362 psi | 76% | 2762 fps | 95.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 36,550 psi | 74% | 2703 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,824 psi | 71% | 2644 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 34,737 psi | 70% | 2582 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 31,662 psi | 64% | 2526 fps | 95.3% |
| Somchem S335 | <<locked>> | 84% | 31,778 psi | 64% | 2530 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 41,191 psi | 84% | 2703 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 32,808 psi | 67% | 2546 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 80% | 28,456 psi | 58% | 2444 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 84% | 26,789 psi | 54% | 2477 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 90% | 34,606 psi | 70% | 2648 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 92% | 35,433 psi | 72% | 2677 fps | 95.4% |
| Winchester 748 | <<locked>> | 92% | 41,437 psi | 84% | 2851 fps | 95.6% |
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 40 powders for 8 x 60 RS loaded with the .323 | 139gr | Geco ZERO. IMR 3031 delivers the highest muzzle velocity at 2,933 fps; across all powders the maximum-charge window runs from 1,811 fps to 2,933 fps. Accurate 2495 gives the best case fill at 100 %, and 40 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 66–90 %, 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 2495, Accurate 4064, Hodgdon TrailBoss 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. IMR 3031, Alliant AR-Comp, Lovex D073.6 rank at the top here: for 8 x 60 RS with the .323 | 139gr | Geco ZERO 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.