Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 125gr | Nosler Partition bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Somchem S365.
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>> | 98% | 44,193 psi | 86% | 2697 fps | 97.3% |
| Accurate 4350 | <<locked>> | 90% | 46,543 psi | 90% | 2759 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 82% | 44,976 psi | 87% | 2657 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 45,049 psi | 87% | 2680 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 44,846 psi | 87% | 2762 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 45,208 psi | 88% | 2789 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,556 psi | 87% | 2776 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,102 psi | 76% | 2674 fps | 96.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 43,584 psi | 85% | 2825 fps | 98.6% |
| Bofors RP3 | <<locked>> | 82% | 45,194 psi | 88% | 2690 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 45,339 psi | 88% | 2657 fps | 96% |
| Hodgdon H380 | <<locked>> | 82% | 45,701 psi | 89% | 2694 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 88% | 45,759 psi | 89% | 2746 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 44,730 psi | 87% | 2700 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 45,339 psi | 88% | 2769 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 70% | 1752 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 45,803 psi | 89% | 2690 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,135 psi | 86% | 2638 fps | 96.1% |
| IMR 4831 | <<locked>> | 90% | 44,338 psi | 86% | 2703 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 44,077 psi | 86% | 2641 fps | 97.6% |
| Lovex S070 | <<locked>> | 88% | 44,686 psi | 87% | 2671 fps | 96.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,233 psi | 76% | 2598 fps | 96% |
| Norma MRP | <<locked>> | 96% | 43,714 psi | 85% | 2789 fps | 96.1% |
| Norma URP | <<locked>> | 90% | 45,948 psi | 89% | 2749 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 44,657 psi | 87% | 2736 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,709 psi | 71% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 46,006 psi | 89% | 2680 fps | 97.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 44,715 psi | 87% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 46,238 psi | 90% | 2779 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 45,165 psi | 88% | 2789 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 84% | 45,353 psi | 88% | 2687 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 45,339 psi | 88% | 2657 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 86% | 44,077 psi | 86% | 2641 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 88% | 44,686 psi | 87% | 2671 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 43,352 psi | 84% | 2680 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 44,164 psi | 86% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 46,456 psi | 90% | 2641 fps | 96.9% |
| Somchem S355 | <<locked>> | 84% | 45,658 psi | 89% | 2684 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 44,338 psi | 86% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 46,499 psi | 90% | 2667 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 44,860 psi | 87% | 2694 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 88% | 44,063 psi | 86% | 2694 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 98% | 46,354 psi | 90% | 2795 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 44,425 psi | 86% | 2667 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 46,035 psi | 89% | 2753 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,147 psi | 78% | 2805 fps | 100% |
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>> | 94% | 38,421 psi | 75% | 2582 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 32,996 psi | 64% | 2474 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 42,148 psi | 82% | 2602 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,192 psi | 82% | 2625 fps | 99.6% |
| Alliant Reloder-16 | 38.2 gr | 80% | 32,721 psi | 64% | 2480 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,767 psi | 71% | 2608 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,776 psi | 56% | 2395 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,680 psi | 71% | 2615 fps | 95.5% |
| Alliant Reloder-26 | 47.5 gr | 90% | 35,404 psi | 69% | 2635 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 42,250 psi | 82% | 2635 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,801 psi | 83% | 2608 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 42,786 psi | 83% | 2638 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 40,030 psi | 78% | 2631 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,284 psi | 59% | 2385 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 86% | 42,206 psi | 82% | 2703 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 52% | 1562 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 42,946 psi | 83% | 2635 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,669 psi | 81% | 2589 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 31,865 psi | 62% | 2431 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 36,579 psi | 71% | 2484 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 39,537 psi | 77% | 2566 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 36,840 psi | 72% | 2546 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 40,669 psi | 79% | 2720 fps | 95% |
| Norma URP | <<locked>> | 80% | 32,967 psi | 64% | 2467 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 86% | 39,218 psi | 76% | 2625 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 53% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,888 psi | 83% | 2618 fps | 96.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,117 psi | 76% | 2671 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,474 psi | 63% | 2484 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 34,563 psi | 67% | 2546 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 39,653 psi | 77% | 2579 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 42,801 psi | 83% | 2608 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,579 psi | 71% | 2484 fps | 95.4% |
| Shooters World SW4350 | <<locked>> | 84% | 39,537 psi | 77% | 2566 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,611 psi | 79% | 2628 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,568 psi | 81% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,727 psi | 79% | 2533 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 40,292 psi | 78% | 2582 fps | 99.2% |
| Somchem S365 | 39 gr | 80% | 29,588 psi | 57% | 2421 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 38,319 psi | 74% | 2513 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,490 psi | 67% | 2477 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 33,895 psi | 66% | 2474 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 86% | 31,328 psi | 61% | 2474 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,808 psi | 66% | 2444 fps | 98% |
| Winchester 760 | <<locked>> | 84% | 40,030 psi | 78% | 2631 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,877 psi | 56% | 2477 fps | 96.3% |
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 46 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 125gr | Nosler Partition. Alliant Reloder-26 delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,825 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 46 of the 46 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 125.0 gr projectile in 0.264" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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, Alliant Reloder-16, Somchem S365 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 125gr | Nosler Partition 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.