Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 129gr | Hornady InterLock bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 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% | 45,353 psi | 88% | 2677 fps | 97.9% |
| Accurate 4350 | <<locked>> | 88% | 44,469 psi | 86% | 2680 fps | 99% |
| ADI AR 2208 | <<locked>> | 82% | 45,745 psi | 89% | 2631 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 45,905 psi | 89% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 45,788 psi | 89% | 2740 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 46,224 psi | 90% | 2766 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,658 psi | 89% | 2756 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,059 psi | 78% | 2664 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 44,817 psi | 87% | 2808 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 46,108 psi | 90% | 2664 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 46,180 psi | 90% | 2638 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 82% | 46,572 psi | 90% | 2671 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 43,743 psi | 85% | 2671 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 45,788 psi | 89% | 2677 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 46,398 psi | 90% | 2753 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,201 psi | 70% | 1726 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 44,092 psi | 86% | 2621 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,904 psi | 87% | 2615 fps | 96.7% |
| IMR 4831 | <<locked>> | 90% | 45,397 psi | 88% | 2680 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 44,875 psi | 87% | 2618 fps | 98.1% |
| Lovex S070 | <<locked>> | 88% | 45,585 psi | 89% | 2651 fps | 97.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,292 psi | 78% | 2585 fps | 96.7% |
| Norma MRP | <<locked>> | 96% | 44,556 psi | 87% | 2766 fps | 96.7% |
| Norma URP | <<locked>> | 88% | 43,947 psi | 85% | 2671 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 90% | 45,687 psi | 89% | 2717 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,753 psi | 71% | 1768 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 45,687 psi | 89% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 43,976 psi | 85% | 2694 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 46,166 psi | 90% | 2772 fps | 99% |
| Rottweil R 903 | <<locked>> | 84% | 46,267 psi | 90% | 2661 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 46,180 psi | 90% | 2638 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 44,875 psi | 87% | 2618 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 88% | 45,585 psi | 89% | 2651 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 44,556 psi | 87% | 2664 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 45,194 psi | 88% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,309 psi | 86% | 2566 fps | 96.7% |
| Somchem S355 | <<locked>> | 84% | 46,499 psi | 90% | 2657 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 45,484 psi | 88% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 44,860 psi | 87% | 2667 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 84% | 44,657 psi | 87% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 45,876 psi | 89% | 2671 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 45,005 psi | 87% | 2671 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 96% | 44,759 psi | 87% | 2726 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 45,368 psi | 88% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,019 psi | 85% | 2677 fps | 96.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,930 psi | 79% | 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>> | 92% | 36,811 psi | 71% | 2510 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 33,779 psi | 66% | 2457 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 80% | 42,830 psi | 83% | 2575 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,960 psi | 83% | 2598 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,547 psi | 65% | 2467 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,579 psi | 73% | 2592 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,528 psi | 53% | 2326 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,244 psi | 68% | 2546 fps | 95.3% |
| Alliant Reloder-26 | 46.2 gr | 88% | 33,779 psi | 66% | 2556 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 43,091 psi | 84% | 2612 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 40,785 psi | 79% | 2530 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 43,584 psi | 85% | 2615 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 40,944 psi | 80% | 2615 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,922 psi | 60% | 2369 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 86% | 43,163 psi | 84% | 2687 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 52% | 1542 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 41,336 psi | 80% | 2566 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,726 psi | 77% | 2510 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 32,576 psi | 63% | 2411 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 37,217 psi | 72% | 2461 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 40,321 psi | 78% | 2546 fps | 95.8% |
| Lovex S071 | <<locked>> | 96% | 35,302 psi | 69% | 2477 fps | 95% |
| Norma MRP | 47.9 gr | 94% | 41,669 psi | 81% | 2707 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,939 psi | 66% | 2457 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 84% | 37,536 psi | 73% | 2549 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,311 psi | 53% | 1575 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,929 psi | 78% | 2651 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,257 psi | 65% | 2464 fps | 95.7% |
| ReloadSwiss RS 70 | 42.7 gr | 82% | 35,317 psi | 69% | 2533 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 40,727 psi | 79% | 2559 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 40,785 psi | 79% | 2530 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,217 psi | 72% | 2461 fps | 96% |
| Shooters World SW4350 | <<locked>> | 84% | 40,321 psi | 78% | 2546 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,713 psi | 81% | 2612 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,540 psi | 83% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,827 psi | 75% | 2457 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 41,046 psi | 80% | 2556 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,458 psi | 59% | 2411 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 42,003 psi | 82% | 2612 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 39,305 psi | 76% | 2497 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,230 psi | 68% | 2457 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 34,606 psi | 67% | 2454 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 29,994 psi | 58% | 2402 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,679 psi | 67% | 2434 fps | 98.6% |
| Winchester 760 | <<locked>> | 84% | 40,944 psi | 80% | 2615 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,717 psi | 54% | 2411 fps | 96.1% |
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 | 129gr | Hornady InterLock. Alliant Reloder-26 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,808 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 129.0 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. Norma MRP, Alliant Reloder-26, ReloadSwiss RS 70 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 129gr | Hornady InterLock 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.