Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 139gr | Norma FMJ Elektron bullet and 52 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% | 44,396 psi | 86% | 2569 fps | 98.3% |
| Accurate 4350 | <<locked>> | 88% | 46,311 psi | 90% | 2615 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 44,585 psi | 87% | 2595 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 44,628 psi | 87% | 2621 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 44,933 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,367 psi | 86% | 2638 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 98% | 44,730 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,640 psi | 81% | 2612 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 43,845 psi | 85% | 2697 fps | 99.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,180 psi | 90% | 2667 fps | 96.3% |
| Bofors RP5 | <<locked>> | 96% | 44,367 psi | 86% | 2638 fps | 96% |
| Bofors RP7 | <<locked>> | 84% | 45,020 psi | 87% | 2523 fps | 97% |
| Hodgdon H414 | <<locked>> | 86% | 45,701 psi | 89% | 2612 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 84% | 46,021 psi | 89% | 2575 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 44,730 psi | 87% | 2562 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 44,686 psi | 87% | 2628 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 70% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 45,556 psi | 88% | 2552 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 46,383 psi | 90% | 2549 fps | 97.7% |
| IMR 4831 | <<locked>> | 88% | 44,367 psi | 86% | 2566 fps | 99.5% |
| Lovex S065 | <<locked>> | 86% | 46,514 psi | 90% | 2552 fps | 98.9% |
| Lovex S070 | <<locked>> | 86% | 44,396 psi | 86% | 2533 fps | 97.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,293 psi | 82% | 2530 fps | 97.9% |
| Norma MRP | <<locked>> | 96% | 46,441 psi | 90% | 2707 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 45,876 psi | 89% | 2608 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 88% | 44,556 psi | 87% | 2598 fps | 98.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,932 psi | 85% | 2612 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,898 psi | 72% | 1696 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 44,570 psi | 87% | 2638 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 46,021 psi | 89% | 2635 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 45,034 psi | 87% | 2654 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 82% | 44,918 psi | 87% | 2539 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 46,253 psi | 90% | 2628 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 84% | 45,020 psi | 87% | 2523 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 86% | 46,514 psi | 90% | 2552 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 86% | 44,396 psi | 86% | 2533 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 46,079 psi | 89% | 2592 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 46,499 psi | 90% | 2451 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,934 psi | 89% | 2503 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,818 psi | 89% | 2621 fps | 96.4% |
| Somchem S355 | <<locked>> | 82% | 45,353 psi | 88% | 2539 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 44,643 psi | 87% | 2615 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 43,787 psi | 85% | 2552 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 84% | 46,311 psi | 90% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 44,701 psi | 87% | 2552 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 98% | 45,948 psi | 89% | 2582 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 86% | 44,019 psi | 85% | 2556 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 94% | 43,845 psi | 85% | 2612 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 43,874 psi | 85% | 2526 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 45,701 psi | 89% | 2612 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,844 psi | 83% | 2736 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,427 psi | 90% | 2595 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% | 33,721 psi | 65% | 2356 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 35,288 psi | 69% | 2402 fps | 97.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 41,989 psi | 82% | 2543 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,693 psi | 67% | 2408 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,117 psi | 76% | 2530 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,481 psi | 81% | 2579 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,411 psi | 49% | 2178 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,445 psi | 63% | 2388 fps | 95% |
| Alliant Reloder-26 | 43.1 gr | 84% | 30,676 psi | 60% | 2388 fps | 95.2% |
| Bofors RP15 | <<locked>> | 98% | 43,468 psi | 84% | 2618 fps | 95.5% |
| Bofors RP5 | <<locked>> | 94% | 41,481 psi | 81% | 2579 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,668 psi | 77% | 2418 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 37,260 psi | 72% | 2444 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 43,076 psi | 84% | 2520 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,314 psi | 63% | 2316 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 82% | 38,841 psi | 75% | 2507 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 53% | 1480 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 40,176 psi | 78% | 2451 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,205 psi | 80% | 2451 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 34,127 psi | 66% | 2359 fps | 97.3% |
| Lovex S065 | <<locked>> | 80% | 38,682 psi | 75% | 2402 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 36,854 psi | 72% | 2382 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 34,925 psi | 68% | 2382 fps | 95.8% |
| Norma MRP | 44.9 gr | 90% | 38,130 psi | 74% | 2539 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,288 psi | 69% | 2398 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 80% | 34,287 psi | 67% | 2385 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 40,886 psi | 79% | 2549 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,514 psi | 53% | 1512 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,597 psi | 81% | 2582 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,867 psi | 68% | 2415 fps | 97.2% |
| ReloadSwiss RS 70 | 40.7 gr | 80% | 34,229 psi | 66% | 2418 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 80% | 42,235 psi | 82% | 2490 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 43,149 psi | 84% | 2572 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 39,668 psi | 77% | 2418 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,682 psi | 75% | 2402 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 80% | 36,854 psi | 72% | 2382 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,337 psi | 84% | 2543 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,700 psi | 85% | 2408 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,811 psi | 73% | 2349 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,743 psi | 83% | 2566 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 42,699 psi | 83% | 2490 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 31,763 psi | 62% | 2356 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 38,551 psi | 75% | 2451 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 40,669 psi | 79% | 2428 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,622 psi | 71% | 2398 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 40,335 psi | 78% | 2480 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 36,027 psi | 70% | 2398 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 27,688 psi | 54% | 2254 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,839 psi | 70% | 2372 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,521 psi | 73% | 2448 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,338 psi | 49% | 2251 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,294 psi | 84% | 2539 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 52 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 139gr | Norma FMJ Elektron. Winchester StaBALL HD delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,657 fps to 2,736 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 52 of the 52 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 70–90 %, 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 FMJ Elektron 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.