Load Specifications
Load data in caliber 7.7 x 58 mm Arisaka with .312 | 215gr | Woodleigh HS bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-17.
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 2495 | <<locked>> | 82% | 38,261 psi | 85% | 2149 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 38,566 psi | 86% | 2185 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 38,986 psi | 87% | 2264 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 40,611 psi | 90% | 2198 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 38,276 psi | 85% | 2264 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 39,827 psi | 89% | 2218 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 84% | 40,509 psi | 90% | 2231 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 39,668 psi | 88% | 2274 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 90% | 39,262 psi | 87% | 2297 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,547 psi | 75% | 2185 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 36,564 psi | 81% | 2300 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 39,479 psi | 88% | 2224 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 40,640 psi | 90% | 2228 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 38,566 psi | 86% | 2221 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 38,232 psi | 85% | 2224 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,925 psi | 78% | 1407 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 40,292 psi | 90% | 2185 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 40,147 psi | 89% | 2267 fps | 98.1% |
| IMR 4895 | <<locked>> | 82% | 38,899 psi | 87% | 2211 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 40,030 psi | 89% | 2188 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 39,247 psi | 87% | 2178 fps | 96.2% |
| Norma 203B | <<locked>> | 84% | 39,798 psi | 89% | 2221 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 39,421 psi | 88% | 2260 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 84% | 39,117 psi | 87% | 2231 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,317 psi | 79% | 1440 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 39,392 psi | 88% | 2270 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 39,334 psi | 87% | 2303 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 38,870 psi | 86% | 2280 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 39,668 psi | 88% | 2290 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 82% | 39,581 psi | 88% | 2159 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 39,349 psi | 88% | 2215 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,247 psi | 87% | 2178 fps | 96.2% |
| Shooters World Precision | <<locked>> | 84% | 40,030 psi | 89% | 2188 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 38,145 psi | 85% | 2221 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 40,350 psi | 90% | 2126 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 40,466 psi | 90% | 2221 fps | 99.3% |
| Somchem S365 | <<locked>> | 98% | 39,784 psi | 88% | 2306 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 38,609 psi | 86% | 2142 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 39,436 psi | 88% | 2152 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 38,551 psi | 86% | 2165 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 38,986 psi | 87% | 2218 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 40,321 psi | 90% | 2188 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 40,611 psi | 90% | 2267 fps | 97.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,578 psi | 79% | 2247 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 39,320 psi | 87% | 2201 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 29,776 psi | 66% | 2162 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 82% | 40,045 psi | 89% | 2218 fps | 99.2% |
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 2495 | <<locked>> | 80% | 35,795 psi | 80% | 2110 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 33,881 psi | 75% | 2103 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 31,734 psi | 71% | 2126 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 33,808 psi | 75% | 2070 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 35,723 psi | 79% | 2211 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,040 psi | 73% | 2090 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,694 psi | 79% | 2142 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 32,996 psi | 73% | 2133 fps | 95.8% |
| Alliant Reloder-17 | 37.6 gr | 80% | 28,471 psi | 63% | 2054 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,181 psi | 63% | 2054 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 34,345 psi | 76% | 2251 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 32,416 psi | 72% | 2093 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 80% | 33,518 psi | 75% | 2093 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 26,803 psi | 60% | 1965 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,926 psi | 80% | 2182 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 58% | 1257 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,447 psi | 79% | 2096 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 31,067 psi | 69% | 2090 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 36,477 psi | 81% | 2165 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 35,259 psi | 78% | 2103 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 36,854 psi | 82% | 2136 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 35,070 psi | 78% | 2133 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 32,605 psi | 73% | 2126 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 34,330 psi | 76% | 2139 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,208 psi | 58% | 1286 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,898 psi | 82% | 2224 fps | 97.9% |
| ReloadSwiss RS 60 | 37.6 gr | 80% | 30,298 psi | 67% | 2113 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 31,966 psi | 71% | 2139 fps | 95% |
| ReloadSwiss RS 70 | 44 gr | 92% | 37,289 psi | 83% | 2244 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,144 psi | 83% | 2116 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 30,501 psi | 68% | 2044 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 36,854 psi | 82% | 2136 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 35,259 psi | 78% | 2103 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,662 psi | 70% | 2090 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,388 psi | 74% | 2011 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 31,546 psi | 70% | 2054 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 24,308 psi | 54% | 1952 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 36,100 psi | 80% | 2103 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,970 psi | 82% | 2113 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,907 psi | 67% | 2001 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 32,256 psi | 72% | 2087 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 35,578 psi | 79% | 2106 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 33,417 psi | 74% | 2133 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 29,414 psi | 65% | 2113 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,645 psi | 64% | 1982 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,065 psi | 62% | 2110 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,318 psi | 83% | 2172 fps | 98.8% |
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 72 powders for 7.7 x 58 mm Arisaka loaded with the .312 | 215gr | Woodleigh HS. Somchem S365 delivers the highest muzzle velocity at 2,306 fps; across all powders the maximum-charge window runs from 1,407 fps to 2,306 fps. Accurate 3100 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 215.0 gr projectile in 0.312" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 7.7 x 58 mm Arisaka with the .312 | 215gr | Woodleigh HS 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.