Load Specifications
Load data in caliber 7.62 x 39 (M43) Russian with .31 | 123gr | Prvi Partizan FMJ bullet and 18 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Lovex S053 and IMR 4227.
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: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 96% | 45,353 psi | 88% | 2343 fps | 95.7% |
| Accurate No. 11 FS | <<locked>> | 84% | 45,237 psi | 88% | 2349 fps | 99.3% |
| ADI AR 2205 | <<locked>> | 86% | 44,237 psi | 86% | 2264 fps | 99.9% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 41,495 psi | 81% | 2392 fps | 98.8% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 44,730 psi | 87% | 2388 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,079 psi | 55% | 1467 fps | 100% |
| IMR 4227 | <<locked>> | 94% | 45,339 psi | 88% | 2356 fps | 98.3% |
| Lovex D060 | <<locked>> | 86% | 44,164 psi | 86% | 2352 fps | 96.5% |
| Lovex D063 | <<locked>> | 84% | 46,108 psi | 90% | 2369 fps | 97% |
| Lovex S053 | <<locked>> | 96% | 45,614 psi | 89% | 2369 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,499 psi | 53% | 1499 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 46,427 psi | 90% | 2415 fps | 98.4% |
| Shooters World Blackout | <<locked>> | 84% | 46,108 psi | 90% | 2369 fps | 97% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 44,164 psi | 86% | 2352 fps | 96.5% |
| Shooters World SOCOM | <<locked>> | 86% | 44,251 psi | 86% | 2326 fps | 97.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 44,063 psi | 86% | 2234 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 45,353 psi | 88% | 2313 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 41,887 psi | 81% | 2362 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 94% | 42,772 psi | 83% | 2303 fps | 95% |
| Accurate No. 11 FS | <<locked>> | 80% | 39,334 psi | 76% | 2257 fps | 98.4% |
| ADI AR 2205 | <<locked>> | 80% | 37,173 psi | 72% | 2152 fps | 99.2% |
| ADI AR 2207 | <<locked>> | 88% | 28,761 psi | 56% | 2139 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 96% | 39,349 psi | 76% | 2300 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,610 psi | 40% | 1312 fps | 100% |
| IMR 4227 | 21 gr | 84% | 33,634 psi | 65% | 2152 fps | 95.3% |
| Lovex D060 | <<locked>> | 82% | 39,378 psi | 76% | 2267 fps | 95.2% |
| Lovex D063 | <<locked>> | 80% | 40,596 psi | 79% | 2280 fps | 95.7% |
| Lovex S053 | 19.6 gr | 80% | 28,805 psi | 56% | 2064 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,957 psi | 39% | 1339 fps | 100% |
| ReloadSwiss RS 36 | 22.8 gr | 86% | 33,910 psi | 66% | 2198 fps | 95.3% |
| Shooters World Blackout | <<locked>> | 80% | 40,596 psi | 79% | 2280 fps | 95.7% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 39,378 psi | 76% | 2267 fps | 95.2% |
| Shooters World SOCOM | <<locked>> | 80% | 36,347 psi | 71% | 2192 fps | 95.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,340 psi | 53% | 1962 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 33,953 psi | 66% | 2142 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 26,063 psi | 51% | 2044 fps | 95.2% |
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 18 powders for 7.62 x 39 (M43) Russian loaded with the .31 | 123gr | Prvi Partizan FMJ. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,415 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,415 fps. ADI AR 2207 gives the best case fill at 100 %, and 18 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 53–90 %, 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. ADI AR 2207, Alliant Reloder-7, 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. ReloadSwiss RS 36, Lovex S053, IMR 4227 rank at the top here: for 7.62 x 39 (M43) Russian 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.