Load Specifications
Load data in caliber 9 x 39 with .366 | 255gr | Geco SOFTPOINT bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Lovex S053, Vihtavuori N120 and SNPE Vectan BA6 1/2.
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: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 82% | 36,347 psi | 88% | 1526 fps | 99% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 37,115 psi | 90% | 1673 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,369 psi | 66% | 1004 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 36,796 psi | 89% | 1585 fps | 96% |
| Lovex S053 | <<locked>> | 92% | 36,970 psi | 89% | 1598 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,876 psi | 65% | 1027 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 36,941 psi | 89% | 1624 fps | 95.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 36,608 psi | 89% | 1526 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 37,347 psi | 90% | 1568 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 35,360 psi | 86% | 1624 fps | 98.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 80% | 34,563 psi | 84% | 1499 fps | 98.6% |
| ADI AR 2207 | <<locked>> | 92% | 29,501 psi | 71% | 1552 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,044 psi | 48% | 892 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 34,490 psi | 83% | 1552 fps | 95.3% |
| Lovex S053 | 17.3 gr | 80% | 26,339 psi | 64% | 1430 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,435 psi | 47% | 912 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 34,606 psi | 84% | 1591 fps | 95.2% |
| SNPE Vectan BA6 1/2 | 15.8 gr | 80% | 25,193 psi | 61% | 1362 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 31,082 psi | 75% | 1486 fps | 100% |
| Vihtavuori N120 | 19.8 gr | 88% | 26,498 psi | 64% | 1473 fps | 95.1% |
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 10 powders for 9 x 39 loaded with the .366 | 255gr | Geco SOFTPOINT. ADI AR 2207 delivers the highest muzzle velocity at 1,673 fps; across all powders the maximum-charge window runs from 1,004 fps to 1,673 fps. ADI AR 2207 gives the best case fill at 100 %, and 10 of the 10 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (285 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. ADI AR 2207, 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. Lovex S053, Vihtavuori N120, SNPE Vectan BA6 1/2 rank at the top here: for 9 x 39 with the .366 | 255gr | Geco SOFTPOINT they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.