Load Specifications
Load data in caliber 7.7 x 58 mm Arisaka with .31 | 123gr | Prvi Partizan FMJ bullet and 30 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 Accurate 4064.
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: 25.9"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 39,668 psi | 88% | 2864 fps | 99.3% |
| Accurate 2460 | <<locked>> | 86% | 40,437 psi | 90% | 2900 fps | 97.2% |
| Accurate 2495 | <<locked>> | 96% | 39,885 psi | 89% | 2940 fps | 99.6% |
| Accurate 2520 | <<locked>> | 90% | 40,451 psi | 90% | 2943 fps | 96.8% |
| Accurate 4064 | <<locked>> | 98% | 39,726 psi | 88% | 2956 fps | 97.9% |
| ADI AR 2219 | <<locked>> | 82% | 39,711 psi | 88% | 2913 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 90% | 38,696 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 40,190 psi | 89% | 2894 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 40,321 psi | 90% | 2808 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 84% | 38,667 psi | 86% | 2890 fps | 98% |
| Hodgdon H335 | <<locked>> | 84% | 39,334 psi | 87% | 2904 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,692 psi | 73% | 1896 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 39,508 psi | 88% | 2976 fps | 98.9% |
| IMR 4198 | <<locked>> | 82% | 38,943 psi | 87% | 2825 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 40,335 psi | 90% | 2897 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 92% | 38,435 psi | 85% | 2910 fps | 96.3% |
| Norma 202 | <<locked>> | 92% | 40,263 psi | 90% | 2923 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,590 psi | 72% | 1939 fps | 100% |
| Rottweil R 901 | <<locked>> | 88% | 39,392 psi | 88% | 2864 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 38,435 psi | 85% | 2910 fps | 96.3% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 40,292 psi | 90% | 2917 fps | 97.3% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 40,524 psi | 90% | 2894 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 40,480 psi | 90% | 2831 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 39,218 psi | 87% | 2822 fps | 98.1% |
| Somchem S335 | <<locked>> | 90% | 39,436 psi | 88% | 2831 fps | 98% |
| Vihtavuori N130 | <<locked>> | 86% | 40,640 psi | 90% | 2841 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 90% | 40,030 psi | 89% | 2841 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 94% | 38,159 psi | 85% | 2894 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 94% | 40,422 psi | 90% | 2900 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 94% | 39,088 psi | 87% | 2887 fps | 97% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.9"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 30,734 psi | 68% | 2651 fps | 97.3% |
| Accurate 2460 | <<locked>> | 82% | 35,128 psi | 78% | 2779 fps | 95.6% |
| Accurate 2495 | <<locked>> | 82% | 24,772 psi | 55% | 2549 fps | 95.2% |
| Accurate 2520 | <<locked>> | 86% | 35,288 psi | 78% | 2825 fps | 95.2% |
| Accurate 4064 | 45.7 gr | 92% | 32,648 psi | 73% | 2789 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 37,202 psi | 83% | 2854 fps | 97.6% |
| Alliant AR-Comp | 39.3 gr | 80% | 28,108 psi | 63% | 2664 fps | 98.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 35,201 psi | 78% | 2782 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 37,782 psi | 84% | 2756 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 80% | 33,968 psi | 76% | 2772 fps | 96.6% |
| Hodgdon H335 | <<locked>> | 80% | 34,272 psi | 76% | 2782 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,149 psi | 54% | 1699 fps | 100% |
| IMR 3031 | 40.2 gr | 82% | 28,572 psi | 64% | 2680 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 36,709 psi | 82% | 2776 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 37,594 psi | 84% | 2835 fps | 95% |
| Lovex D073.6 | <<locked>> | 90% | 35,969 psi | 80% | 2854 fps | 95.4% |
| Norma 202 | <<locked>> | 86% | 33,185 psi | 74% | 2756 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,192 psi | 54% | 1742 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 34,751 psi | 77% | 2753 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 35,969 psi | 80% | 2854 fps | 95.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 37,608 psi | 84% | 2854 fps | 96.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 35,737 psi | 79% | 2785 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 33,533 psi | 75% | 2671 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 30,763 psi | 68% | 2618 fps | 95.4% |
| Somchem S335 | <<locked>> | 82% | 30,777 psi | 68% | 2621 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 33,765 psi | 75% | 2687 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 80% | 29,356 psi | 65% | 2582 fps | 96.6% |
| Vihtavuori N135 | <<locked>> | 82% | 26,179 psi | 58% | 2572 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 88% | 33,446 psi | 74% | 2740 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 90% | 34,330 psi | 76% | 2772 fps | 95.4% |
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 30 powders for 7.7 x 58 mm Arisaka loaded with the .31 | 123gr | Prvi Partizan FMJ. IMR 3031 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,896 fps to 2,976 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 30 of the 30 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 123.0 gr projectile in 0.31" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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, Accurate 4064 rank at the top here: for 7.7 x 58 mm Arisaka with the .31 | 123gr | Prvi Partizan FMJ 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.