Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 139gr | Norma HP bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and ReloadSwiss RS 70.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 44,280 psi | 86% | 2566 fps | 98.3% |
| Accurate 4350 | <<locked>> | 88% | 46,470 psi | 90% | 2618 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 44,744 psi | 87% | 2621 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 44,730 psi | 87% | 2638 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,266 psi | 86% | 2635 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 44,556 psi | 87% | 2638 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,495 psi | 81% | 2608 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 43,714 psi | 85% | 2694 fps | 99.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,340 psi | 90% | 2674 fps | 96.3% |
| Bofors RP5 | <<locked>> | 96% | 44,266 psi | 86% | 2635 fps | 95.9% |
| Bofors RP7 | <<locked>> | 84% | 44,875 psi | 87% | 2520 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 86% | 45,571 psi | 89% | 2608 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 84% | 45,847 psi | 89% | 2572 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 44,556 psi | 87% | 2556 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 44,846 psi | 87% | 2628 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,376 psi | 71% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 45,368 psi | 88% | 2549 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 46,499 psi | 90% | 2549 fps | 97.7% |
| IMR 4831 | <<locked>> | 88% | 44,222 psi | 86% | 2562 fps | 99.4% |
| Lovex S065 | <<locked>> | 86% | 46,369 psi | 90% | 2549 fps | 98.8% |
| Lovex S070 | <<locked>> | 86% | 44,498 psi | 86% | 2536 fps | 97.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,134 psi | 82% | 2526 fps | 97.8% |
| Norma MRP | <<locked>> | 94% | 43,540 psi | 85% | 2654 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 45,701 psi | 89% | 2602 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 88% | 44,367 psi | 86% | 2595 fps | 98.2% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,801 psi | 85% | 2608 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,985 psi | 72% | 1696 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 44,396 psi | 86% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 46,137 psi | 90% | 2635 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 44,860 psi | 87% | 2651 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 82% | 45,063 psi | 88% | 2543 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 46,064 psi | 89% | 2625 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 84% | 44,875 psi | 87% | 2520 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 46,369 psi | 90% | 2549 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 86% | 44,498 psi | 86% | 2536 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 46,195 psi | 90% | 2592 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,774 psi | 89% | 2500 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,629 psi | 89% | 2618 fps | 96.3% |
| Somchem S355 | <<locked>> | 82% | 45,194 psi | 88% | 2536 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 44,498 psi | 86% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 43,642 psi | 85% | 2549 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 84% | 46,151 psi | 90% | 2520 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 44,556 psi | 87% | 2549 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 98% | 45,788 psi | 89% | 2579 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 86% | 43,888 psi | 85% | 2552 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 94% | 43,671 psi | 85% | 2608 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 43,772 psi | 85% | 2523 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 45,571 psi | 89% | 2608 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,699 psi | 83% | 2733 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,325 psi | 90% | 2592 fps | 96.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 33,837 psi | 66% | 2356 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 35,099 psi | 68% | 2395 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,563 psi | 67% | 2405 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,986 psi | 76% | 2526 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,379 psi | 80% | 2579 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,890 psi | 52% | 2228 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,534 psi | 67% | 2444 fps | 96% |
| Alliant Reloder-26 | 43.1 gr | 84% | 30,763 psi | 60% | 2388 fps | 95.3% |
| Bofors RP15 | <<locked>> | 98% | 43,308 psi | 84% | 2615 fps | 95.5% |
| Bofors RP5 | <<locked>> | 94% | 41,379 psi | 80% | 2579 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 39,508 psi | 77% | 2415 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 37,144 psi | 72% | 2441 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 42,917 psi | 83% | 2516 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,155 psi | 62% | 2310 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 82% | 38,711 psi | 75% | 2503 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 53% | 1480 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 40,059 psi | 78% | 2448 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,046 psi | 80% | 2448 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 34,011 psi | 66% | 2356 fps | 97.3% |
| Lovex S065 | <<locked>> | 80% | 38,537 psi | 75% | 2398 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 36,738 psi | 71% | 2379 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 34,795 psi | 68% | 2379 fps | 95.7% |
| Norma MRP | 44.8 gr | 90% | 38,014 psi | 74% | 2536 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,128 psi | 68% | 2395 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 34,156 psi | 66% | 2382 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 98% | 40,756 psi | 79% | 2546 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 54% | 1512 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,423 psi | 80% | 2582 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,940 psi | 68% | 2415 fps | 97.2% |
| ReloadSwiss RS 70 | 40.6 gr | 80% | 34,084 psi | 66% | 2415 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 80% | 42,061 psi | 82% | 2487 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 42,975 psi | 83% | 2566 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 39,508 psi | 77% | 2415 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,537 psi | 75% | 2398 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 80% | 36,738 psi | 71% | 2379 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,192 psi | 84% | 2539 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,695 psi | 73% | 2346 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,554 psi | 83% | 2562 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 42,569 psi | 83% | 2490 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 31,618 psi | 61% | 2352 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 38,377 psi | 75% | 2448 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 40,538 psi | 79% | 2421 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,463 psi | 71% | 2395 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 40,219 psi | 78% | 2477 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 36,129 psi | 70% | 2398 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 27,557 psi | 54% | 2247 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,708 psi | 69% | 2369 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,391 psi | 73% | 2444 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,411 psi | 49% | 2254 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,163 psi | 84% | 2536 fps | 95.3% |
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 50 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 139gr | Norma HP. Winchester StaBALL HD delivers the highest muzzle velocity at 2,733 fps; across all powders the maximum-charge window runs from 1,657 fps to 2,733 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 50 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.264" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Bofors RP15, 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. Alliant Reloder-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 139gr | Norma HP 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.