Load Specifications
Load data in caliber 7.7 x 58 mm Arisaka with .3115 | 255gr | Hornady Sub-X bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Somchem S365.
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 3100ᴾ | <<locked>> | 100% | 38,276 psi | 85% | 2037 fps | 97.6% |
| Accurate 4064 | <<locked>> | 82% | 40,335 psi | 90% | 1995 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 38,609 psi | 86% | 2047 fps | 99% |
| ADI AR 2208 | <<locked>> | 82% | 39,349 psi | 88% | 1975 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 39,030 psi | 87% | 1995 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,754 psi | 86% | 2057 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 38,421 psi | 85% | 2077 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,217 psi | 83% | 2067 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 33,011 psi | 73% | 1991 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,290 psi | 85% | 2146 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 38,464 psi | 86% | 1998 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 39,697 psi | 88% | 1982 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 82% | 39,450 psi | 88% | 2005 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 88% | 38,783 psi | 86% | 2047 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 40,292 psi | 90% | 2047 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 79% | 1276 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 39,668 psi | 88% | 2005 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 38,885 psi | 86% | 1969 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 39,755 psi | 88% | 2051 fps | 99.2% |
| Lovex S065 | <<locked>> | 88% | 40,625 psi | 90% | 2005 fps | 98.2% |
| Lovex S070 | <<locked>> | 88% | 38,493 psi | 86% | 1988 fps | 96.7% |
| Norma MRP | <<locked>> | 98% | 38,740 psi | 86% | 2113 fps | 96.4% |
| Norma URP | <<locked>> | 90% | 38,624 psi | 86% | 2044 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 82% | 40,567 psi | 90% | 2047 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 92% | 40,350 psi | 90% | 2080 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 80% | 1306 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,074 psi | 89% | 1995 fps | 97.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 38,305 psi | 85% | 2077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,174 psi | 85% | 2067 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,537 psi | 86% | 2080 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 84% | 38,682 psi | 86% | 1998 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 39,697 psi | 88% | 1982 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,625 psi | 90% | 2005 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 88% | 38,493 psi | 86% | 1988 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 39,842 psi | 89% | 2044 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 39,146 psi | 87% | 1903 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 40,016 psi | 89% | 1962 fps | 96.8% |
| Somchem S355 | <<locked>> | 84% | 39,494 psi | 88% | 1998 fps | 99.8% |
| Somchem S365 | <<locked>> | 94% | 39,465 psi | 88% | 2090 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 39,146 psi | 87% | 2037 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 86% | 40,263 psi | 90% | 1985 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 38,058 psi | 85% | 2001 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 90% | 39,813 psi | 89% | 2047 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,306 psi | 90% | 2123 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,538 psi | 90% | 2028 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 38,783 psi | 86% | 2047 fps | 96.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,127 psi | 74% | 2080 fps | 99.8% |
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 3100 | <<locked>> | 94% | 31,415 psi | 70% | 1919 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 37,956 psi | 84% | 1962 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 27,441 psi | 61% | 1841 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,130 psi | 83% | 1939 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,477 psi | 81% | 1955 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 28,572 psi | 64% | 1854 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,560 psi | 70% | 1949 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 24,685 psi | 55% | 1791 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 98% | 31,024 psi | 69% | 1946 fps | 95.1% |
| Alliant Reloder-26 | 41.2 gr | 90% | 29,298 psi | 65% | 1955 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 36,216 psi | 81% | 1962 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 37,188 psi | 83% | 1939 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 36,912 psi | 82% | 1965 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 33,982 psi | 76% | 1959 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,136 psi | 58% | 1778 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 59% | 1135 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 37,188 psi | 83% | 1962 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 36,477 psi | 81% | 1926 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 27,064 psi | 60% | 1814 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 32,024 psi | 71% | 1854 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 34,011 psi | 76% | 1909 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 36,318 psi | 81% | 2070 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 28,239 psi | 63% | 1844 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 37,942 psi | 84% | 2008 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 31,459 psi | 70% | 1916 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 60% | 1165 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 37,521 psi | 83% | 1952 fps | 96.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,605 psi | 75% | 1995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 27,383 psi | 61% | 1854 fps | 95.2% |
| ReloadSwiss RS 70 | 37.2 gr | 82% | 29,617 psi | 66% | 1896 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 33,953 psi | 76% | 1919 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 37,188 psi | 83% | 1939 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 32,024 psi | 71% | 1854 fps | 95.8% |
| Shooters World SW4350 | <<locked>> | 84% | 34,011 psi | 76% | 1909 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,853 psi | 78% | 1959 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,535 psi | 81% | 1864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 35,128 psi | 78% | 1886 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 35,056 psi | 78% | 1926 fps | 99.4% |
| Somchem S365 | 33.9 gr | 80% | 25,295 psi | 56% | 1811 fps | 98.1% |
| Somchem S385 | <<locked>> | 94% | 36,622 psi | 81% | 1998 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 33,112 psi | 74% | 1873 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 29,501 psi | 66% | 1844 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 28,805 psi | 64% | 1847 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 24,439 psi | 54% | 1804 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,399 psi | 65% | 1827 fps | 98.2% |
| Winchester 760 | <<locked>> | 84% | 34,243 psi | 76% | 1965 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 24,366 psi | 54% | 1847 fps | 96.1% |
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 47 powders for 7.7 x 58 mm Arisaka loaded with the .3115 | 255gr | Hornady Sub-X. Alliant Reloder-26 delivers the highest muzzle velocity at 2,146 fps; across all powders the maximum-charge window runs from 1,276 fps to 2,146 fps. Accurate 3100 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 255.0 gr projectile in 0.3115" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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 Reloder-26, ReloadSwiss RS 70, Somchem S365 rank at the top here: for 7.7 x 58 mm Arisaka with the .3115 | 255gr | Hornady Sub-X 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.