Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 120gr | Barnes X S bullet and 36 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N555 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>> | 98% | 46,166 psi | 90% | 2759 fps | 97.2% |
| Accurate 4350 | <<locked>> | 88% | 45,252 psi | 88% | 2762 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 82% | 45,876 psi | 89% | 2703 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 46,572 psi | 90% | 2736 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 46,079 psi | 89% | 2815 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 86% | 46,253 psi | 90% | 2838 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,803 psi | 89% | 2831 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,567 psi | 79% | 2733 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 45,150 psi | 88% | 2884 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 45,803 psi | 89% | 2753 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,463 psi | 71% | 1785 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,339 psi | 88% | 2687 fps | 95.9% |
| IMR 4831 | <<locked>> | 90% | 45,745 psi | 89% | 2759 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 45,484 psi | 88% | 2694 fps | 97.4% |
| Lovex S070 | <<locked>> | 88% | 46,441 psi | 90% | 2730 fps | 96.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,307 psi | 80% | 2664 fps | 96% |
| Norma URP | <<locked>> | 88% | 44,498 psi | 86% | 2753 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 45,832 psi | 89% | 2785 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 72% | 1827 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 45,977 psi | 89% | 2841 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 44,599 psi | 87% | 2779 fps | 98.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 46,267 psi | 90% | 2841 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 82% | 44,440 psi | 86% | 2697 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 45,484 psi | 88% | 2694 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 88% | 46,441 psi | 90% | 2730 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 44,759 psi | 87% | 2740 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 45,730 psi | 89% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,947 psi | 87% | 2638 fps | 95.9% |
| Somchem S355 | <<locked>> | 82% | 44,556 psi | 87% | 2690 fps | 99.5% |
| Somchem S365 | <<locked>> | 92% | 45,542 psi | 88% | 2812 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 45,150 psi | 88% | 2671 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 46,021 psi | 89% | 2743 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 88% | 45,730 psi | 89% | 2753 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 96% | 45,194 psi | 88% | 2808 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 45,513 psi | 88% | 2717 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,481 psi | 81% | 2864 fps | 99.9% |
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>> | 92% | 38,159 psi | 74% | 2598 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 34,998 psi | 68% | 2543 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 43,337 psi | 84% | 2654 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,729 psi | 85% | 2684 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,185 psi | 66% | 2539 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,101 psi | 74% | 2667 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,458 psi | 59% | 2461 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 38,247 psi | 74% | 2674 fps | 95.3% |
| Alliant Reloder-26 | 47 gr | 90% | 37,159 psi | 72% | 2700 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,010 psi | 62% | 2451 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 53% | 1594 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,656 psi | 83% | 2635 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 33,808 psi | 66% | 2497 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 38,406 psi | 75% | 2546 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 41,118 psi | 80% | 2621 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 38,972 psi | 76% | 2615 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 34,664 psi | 67% | 2533 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 86% | 40,495 psi | 79% | 2677 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,659 psi | 54% | 1631 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,321 psi | 78% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,360 psi | 67% | 2552 fps | 95.1% |
| ReloadSwiss RS 70 | 43.4 gr | 84% | 38,232 psi | 74% | 2661 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 41,698 psi | 81% | 2644 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,406 psi | 75% | 2546 fps | 95.4% |
| Shooters World SW4350 | <<locked>> | 84% | 41,118 psi | 80% | 2621 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,032 psi | 82% | 2684 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,859 psi | 83% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 42,482 psi | 83% | 2589 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 42,061 psi | 82% | 2641 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 31,459 psi | 61% | 2493 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 40,016 psi | 78% | 2575 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 35,911 psi | 70% | 2533 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 35,723 psi | 69% | 2539 fps | 95.7% |
| Vihtavuori N555 | 40 gr | 84% | 31,357 psi | 61% | 2493 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,360 psi | 69% | 2503 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,993 psi | 56% | 2490 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 36 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 120gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,785 fps to 2,884 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 36 of the 36 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 120.0 gr projectile in 0.264" calls for a 1:10.0 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, Vihtavuori N555, ReloadSwiss RS 70 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 120gr | Barnes X S 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.