Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 131gr | Sellier & Bellot SP bullet and 45 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Vihtavuori N555.
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% | 46,021 psi | 89% | 2671 fps | 98.2% |
| Accurate 4350 | <<locked>> | 88% | 45,063 psi | 88% | 2671 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 82% | 46,166 psi | 90% | 2621 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 46,412 psi | 90% | 2644 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 46,311 psi | 90% | 2733 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 43,772 psi | 85% | 2700 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,267 psi | 90% | 2746 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,553 psi | 79% | 2661 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 45,469 psi | 88% | 2805 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 43,976 psi | 85% | 2579 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 86% | 44,309 psi | 86% | 2664 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 46,412 psi | 90% | 2667 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,685 psi | 85% | 2680 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,245 psi | 70% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 44,570 psi | 87% | 2612 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,614 psi | 89% | 2612 fps | 97.1% |
| IMR 4831 | <<locked>> | 90% | 45,934 psi | 89% | 2674 fps | 99.4% |
| Lovex S065 | <<locked>> | 86% | 45,382 psi | 88% | 2608 fps | 98.3% |
| Lovex S070 | <<locked>> | 88% | 46,108 psi | 90% | 2641 fps | 97.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,886 psi | 79% | 2575 fps | 97% |
| Norma MRP | <<locked>> | 96% | 45,426 psi | 88% | 2766 fps | 97.1% |
| Norma URP | <<locked>> | 88% | 44,498 psi | 86% | 2661 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 46,267 psi | 90% | 2710 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,796 psi | 71% | 1755 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 46,543 psi | 90% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 44,904 psi | 87% | 2694 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 43,743 psi | 85% | 2707 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 82% | 43,801 psi | 85% | 2598 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 43,976 psi | 85% | 2579 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 45,382 psi | 88% | 2608 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 88% | 46,108 psi | 90% | 2641 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 45,078 psi | 88% | 2654 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 45,614 psi | 89% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,773 psi | 87% | 2559 fps | 97% |
| Somchem S355 | <<locked>> | 82% | 44,353 psi | 86% | 2602 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 46,151 psi | 90% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 45,426 psi | 88% | 2661 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 84% | 45,150 psi | 88% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 46,398 psi | 90% | 2661 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 98% | 44,730 psi | 87% | 2635 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 88% | 45,571 psi | 89% | 2664 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 96% | 45,455 psi | 88% | 2720 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 45,890 psi | 89% | 2638 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,599 psi | 87% | 2671 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,785 psi | 81% | 2789 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>> | 90% | 35,099 psi | 68% | 2457 fps | 95.1% |
| Accurate 4350 | <<locked>> | 80% | 34,243 psi | 67% | 2451 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 80% | 43,540 psi | 85% | 2572 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,743 psi | 85% | 2595 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,910 psi | 66% | 2461 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,014 psi | 74% | 2582 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,050 psi | 54% | 2326 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,897 psi | 70% | 2546 fps | 95.9% |
| Alliant Reloder-26 | 45.2 gr | 86% | 32,068 psi | 62% | 2493 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 41,234 psi | 80% | 2523 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 82% | 38,769 psi | 75% | 2549 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,314 psi | 61% | 2359 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 84% | 40,654 psi | 79% | 2618 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 53% | 1532 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 41,756 psi | 81% | 2556 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,118 psi | 78% | 2500 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,996 psi | 64% | 2405 fps | 96.4% |
| Lovex S065 | <<locked>> | 80% | 37,637 psi | 73% | 2454 fps | 96.4% |
| Lovex S070 | <<locked>> | 82% | 38,203 psi | 74% | 2484 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 36,071 psi | 70% | 2477 fps | 95.5% |
| Norma MRP | <<locked>> | 92% | 39,523 psi | 77% | 2641 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,374 psi | 67% | 2451 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 82% | 35,636 psi | 69% | 2487 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 53% | 1565 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,451 psi | 79% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,968 psi | 66% | 2467 fps | 96.3% |
| ReloadSwiss RS 70 | 41.6 gr | 80% | 33,272 psi | 65% | 2461 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 41,234 psi | 80% | 2549 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 41,234 psi | 80% | 2523 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,637 psi | 73% | 2454 fps | 96.4% |
| Shooters World SW4350 | <<locked>> | 82% | 38,203 psi | 74% | 2484 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,235 psi | 82% | 2602 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,946 psi | 83% | 2474 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,479 psi | 77% | 2454 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 41,495 psi | 81% | 2546 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,893 psi | 60% | 2405 fps | 98.7% |
| Somchem S385 | <<locked>> | 90% | 40,059 psi | 78% | 2556 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 39,769 psi | 77% | 2487 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,665 psi | 69% | 2451 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 41,843 psi | 81% | 2582 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 35,056 psi | 68% | 2448 fps | 96.6% |
| Vihtavuori N555 | 39.3 gr | 82% | 28,601 psi | 56% | 2346 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,099 psi | 68% | 2425 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 39,015 psi | 76% | 2556 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,368 psi | 51% | 2346 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 45 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 131gr | Sellier & Bellot SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,805 fps; across all powders the maximum-charge window runs from 1,716 fps to 2,805 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 45 of the 45 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 131.0 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, ReloadSwiss RS 70, Vihtavuori N555 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 131gr | Sellier & Bellot SP 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.