Load Specifications
Load data in caliber 7.7 x 58 mm Arisaka with .311 | 150gr | Norma Semi Soft Point bullet and 42 powders. The key underlying parameters are shown in the table above.
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>> | 82% | 38,653 psi | 86% | 2585 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 40,147 psi | 89% | 2680 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 39,581 psi | 88% | 2674 fps | 98.6% |
| Accurate 4064 | <<locked>> | 92% | 40,161 psi | 89% | 2707 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 40,205 psi | 89% | 2674 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 39,987 psi | 89% | 2644 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 84% | 38,101 psi | 85% | 2657 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 39,624 psi | 88% | 2690 fps | 96.8% |
| Bofors RP3 | <<locked>> | 92% | 39,117 psi | 87% | 2694 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 39,972 psi | 89% | 2598 fps | 97.6% |
| Hodgdon BL-C2 | <<locked>> | 86% | 40,393 psi | 90% | 2710 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 86% | 40,422 psi | 90% | 2690 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 38,566 psi | 86% | 2697 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,852 psi | 75% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 39,233 psi | 87% | 2644 fps | 96% |
| IMR 3031 | <<locked>> | 86% | 38,986 psi | 87% | 2703 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 39,987 psi | 89% | 2644 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 86% | 38,203 psi | 85% | 2657 fps | 98.3% |
| Lovex S062 | <<locked>> | 90% | 39,900 psi | 89% | 2661 fps | 97.2% |
| Norma 201 | <<locked>> | 86% | 39,450 psi | 88% | 2635 fps | 97.1% |
| Norma 202 | <<locked>> | 86% | 39,305 psi | 87% | 2654 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,924 psi | 75% | 1772 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 39,871 psi | 89% | 2776 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 82% | 38,377 psi | 85% | 2595 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 88% | 39,697 psi | 88% | 2631 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 94% | 39,030 psi | 87% | 2684 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 38,203 psi | 85% | 2657 fps | 98.3% |
| Shooters World Precision | <<locked>> | 90% | 39,900 psi | 89% | 2661 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 39,146 psi | 87% | 2562 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 40,683 psi | 90% | 2605 fps | 99.7% |
| Somchem S321 | <<locked>> | 82% | 40,147 psi | 89% | 2671 fps | 97.5% |
| Somchem S335 | <<locked>> | 84% | 38,392 psi | 85% | 2566 fps | 99.3% |
| Somchem S355 | <<locked>> | 94% | 40,408 psi | 90% | 2694 fps | 96.5% |
| Vihtavuori N133 | <<locked>> | 84% | 38,957 psi | 87% | 2566 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 38,116 psi | 85% | 2628 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 39,726 psi | 88% | 2638 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 94% | 38,638 psi | 86% | 2631 fps | 97.4% |
| Vihtavuori N530 | <<locked>> | 84% | 39,943 psi | 89% | 2641 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 88% | 38,130 psi | 85% | 2625 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 40,364 psi | 90% | 2654 fps | 96% |
| Winchester 748 | <<locked>> | 84% | 38,421 psi | 85% | 2674 fps | 97.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 40,495 psi | 90% | 2700 fps | 96.6% |
Start Load - Barrel Length: 25.9"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 36,260 psi | 81% | 2539 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 28,718 psi | 64% | 2428 fps | 98.9% |
| Accurate 2520 | <<locked>> | 80% | 34,534 psi | 77% | 2566 fps | 97.5% |
| Accurate 4064 | <<locked>> | 80% | 27,224 psi | 61% | 2398 fps | 96% |
| ADI AR 2206H | <<locked>> | 84% | 37,782 psi | 84% | 2621 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 35,244 psi | 78% | 2539 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 33,518 psi | 75% | 2562 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 34,882 psi | 78% | 2585 fps | 95.3% |
| Bofors RP3 | <<locked>> | 88% | 34,084 psi | 76% | 2582 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 37,623 psi | 84% | 2549 fps | 97% |
| Hodgdon BL-C2 | <<locked>> | 80% | 32,735 psi | 73% | 2539 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 82% | 35,650 psi | 79% | 2582 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 36,274 psi | 81% | 2644 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,106 psi | 56% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 36,840 psi | 82% | 2592 fps | 95.3% |
| IMR 3031 | <<locked>> | 80% | 31,879 psi | 71% | 2543 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 35,244 psi | 78% | 2539 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 80% | 31,009 psi | 69% | 2490 fps | 96.2% |
| Lovex S062 | <<locked>> | 84% | 33,257 psi | 74% | 2510 fps | 95.1% |
| Norma 201 | <<locked>> | 82% | 34,809 psi | 77% | 2530 fps | 95.6% |
| Norma 202 | <<locked>> | 80% | 32,430 psi | 72% | 2497 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,063 psi | 56% | 1585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 32,851 psi | 73% | 2595 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 36,289 psi | 81% | 2546 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 84% | 35,201 psi | 78% | 2533 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 92% | 36,579 psi | 81% | 2631 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,009 psi | 69% | 2490 fps | 96.2% |
| Shooters World Precision | <<locked>> | 84% | 33,257 psi | 74% | 2510 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 34,606 psi | 77% | 2464 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,036 psi | 62% | 2323 fps | 96.9% |
| Somchem S321 | <<locked>> | 80% | 37,478 psi | 83% | 2615 fps | 96.8% |
| Somchem S335 | <<locked>> | 80% | 33,924 psi | 75% | 2467 fps | 98.5% |
| Somchem S355 | <<locked>> | 92% | 37,956 psi | 84% | 2641 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 34,490 psi | 77% | 2474 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 80% | 29,530 psi | 66% | 2438 fps | 99% |
| Vihtavuori N140 | <<locked>> | 80% | 30,574 psi | 68% | 2431 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 88% | 31,865 psi | 71% | 2477 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 34,911 psi | 78% | 2530 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 29,501 psi | 66% | 2418 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 37,840 psi | 84% | 2598 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 33,692 psi | 75% | 2566 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 86% | 37,826 psi | 84% | 2644 fps | 95.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 42 powders for 7.7 x 58 mm Arisaka loaded with the .311 | 150gr | Norma Semi Soft Point. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,776 fps; across all powders the maximum-charge window runs from 1,732 fps to 2,776 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.311" calls for a 1:17.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.