Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 125gr | Hasler ARIETE 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, 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 3100ᴾ | <<locked>> | 100% | 43,729 psi | 85% | 2674 fps | 96.9% |
| Accurate 4064 | <<locked>> | 82% | 44,454 psi | 86% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 46,340 psi | 90% | 2740 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 84% | 45,484 psi | 88% | 2648 fps | 99.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 46,354 psi | 90% | 2795 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 45,440 psi | 88% | 2671 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 45,701 psi | 89% | 2684 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 45,092 psi | 88% | 2749 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 88% | 45,426 psi | 88% | 2776 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,568 psi | 81% | 2700 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,511 psi | 85% | 2805 fps | 98.3% |
| Bofors RP3 | <<locked>> | 84% | 45,310 psi | 88% | 2677 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 46,340 psi | 90% | 2690 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 90% | 45,934 psi | 89% | 2736 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 44,570 psi | 87% | 2684 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 69% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 44,962 psi | 87% | 2631 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 46,180 psi | 90% | 2677 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,831 psi | 87% | 2631 fps | 95.9% |
| IMR 4831 | <<locked>> | 92% | 44,150 psi | 86% | 2684 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 44,701 psi | 87% | 2628 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 44,454 psi | 86% | 2631 fps | 97.3% |
| Lovex S070 | <<locked>> | 90% | 44,846 psi | 87% | 2657 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 45,078 psi | 88% | 2674 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 46,108 psi | 90% | 2736 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 82% | 45,005 psi | 87% | 2690 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 92% | 44,773 psi | 87% | 2723 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 71% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 46,499 psi | 90% | 2671 fps | 97.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 45,136 psi | 88% | 2779 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 46,195 psi | 90% | 2762 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 45,556 psi | 88% | 2779 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 86% | 45,542 psi | 88% | 2674 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,454 psi | 86% | 2631 fps | 97.3% |
| Shooters World Precision | <<locked>> | 82% | 44,701 psi | 87% | 2628 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 44,846 psi | 87% | 2657 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 43,888 psi | 85% | 2677 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 44,918 psi | 87% | 2552 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,063 psi | 86% | 2579 fps | 95.9% |
| Somchem S355 | <<locked>> | 86% | 46,137 psi | 90% | 2677 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 44,063 psi | 86% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 46,514 psi | 90% | 2618 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 44,048 psi | 86% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 45,020 psi | 87% | 2680 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 45,368 psi | 88% | 2621 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 44,266 psi | 86% | 2684 fps | 98.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,963 psi | 89% | 2779 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 44,802 psi | 87% | 2657 fps | 99.8% |
| Winchester 760 | <<locked>> | 90% | 45,934 psi | 89% | 2736 fps | 96.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,434 psi | 73% | 2720 fps | 99.5% |
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>> | 96% | 38,305 psi | 74% | 2566 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,408 psi | 80% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,909 psi | 64% | 2461 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 40,205 psi | 78% | 2546 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,207 psi | 84% | 2733 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,798 psi | 77% | 2566 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,960 psi | 83% | 2635 fps | 98.8% |
| Alliant Reloder-16 | 37.1 gr | 82% | 33,069 psi | 64% | 2474 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,635 psi | 67% | 2543 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,790 psi | 56% | 2382 fps | 95.1% |
| Alliant Reloder-26 | 45.9 gr | 92% | 35,230 psi | 68% | 2612 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 39,871 psi | 77% | 2575 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 40,596 psi | 79% | 2579 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 88% | 42,873 psi | 83% | 2677 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,442 psi | 55% | 2320 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 52% | 1539 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,235 psi | 82% | 2579 fps | 98.7% |
| IMR 4350 | <<locked>> | 90% | 43,453 psi | 84% | 2628 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,959 psi | 81% | 2575 fps | 95.1% |
| IMR 4831 | <<locked>> | 84% | 34,214 psi | 66% | 2477 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 42,047 psi | 82% | 2579 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 36,985 psi | 72% | 2477 fps | 95.2% |
| Lovex S070 | <<locked>> | 88% | 42,192 psi | 82% | 2605 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 42,322 psi | 82% | 2621 fps | 99% |
| Norma URP | <<locked>> | 82% | 33,243 psi | 65% | 2464 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 41,989 psi | 82% | 2635 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 39,291 psi | 76% | 2612 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 53% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,654 psi | 79% | 2556 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,869 psi | 72% | 2608 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,969 psi | 68% | 2533 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,086 psi | 72% | 2592 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,275 psi | 72% | 2516 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,985 psi | 72% | 2477 fps | 95.2% |
| Shooters World Precision | <<locked>> | 80% | 42,047 psi | 82% | 2579 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 42,192 psi | 82% | 2605 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,421 psi | 75% | 2569 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,537 psi | 77% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,089 psi | 80% | 2523 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 38,014 psi | 74% | 2520 fps | 98.6% |
| Somchem S365 | 37 gr | 80% | 27,949 psi | 54% | 2362 fps | 96.7% |
| Vihtavuori N135 | <<locked>> | 80% | 43,584 psi | 85% | 2572 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,187 psi | 70% | 2457 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 34,621 psi | 67% | 2467 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 42,656 psi | 83% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,040 psi | 66% | 2464 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 31,053 psi | 60% | 2457 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,126 psi | 62% | 2388 fps | 97.1% |
| Winchester 760 | <<locked>> | 88% | 43,163 psi | 84% | 2684 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,790 psi | 56% | 2454 fps | 95.5% |
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 | 125gr | Hasler ARIETE. Alliant Reloder-26 delivers the highest muzzle velocity at 2,805 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,805 fps. Accurate 3100 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 69–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.264" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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 | Hasler ARIETE 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.