Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 140gr | Barnes X S bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD and Norma MRP.
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>> | 94% | 44,947 psi | 87% | 2543 fps | 98.4% |
| Accurate 4350 | <<locked>> | 84% | 43,947 psi | 85% | 2539 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 86% | 44,454 psi | 86% | 2585 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 82% | 44,643 psi | 87% | 2605 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,280 psi | 86% | 2605 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 44,860 psi | 87% | 2612 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,454 psi | 86% | 2635 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 92% | 43,772 psi | 85% | 2664 fps | 99.4% |
| Bofors RP15 | <<locked>> | 98% | 46,267 psi | 90% | 2641 fps | 96.3% |
| Bofors RP5 | <<locked>> | 94% | 44,280 psi | 86% | 2605 fps | 95.9% |
| Bofors RP7 | <<locked>> | 82% | 44,991 psi | 87% | 2490 fps | 97% |
| Hodgdon H414 | <<locked>> | 84% | 45,469 psi | 88% | 2575 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 82% | 45,455 psi | 88% | 2533 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 44,788 psi | 87% | 2530 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,482 psi | 84% | 2657 fps | 96% |
| Hodgdon Superformance | <<locked>> | 84% | 44,353 psi | 86% | 2589 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,666 psi | 71% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 45,382 psi | 88% | 2520 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 45,890 psi | 89% | 2510 fps | 97.6% |
| IMR 4831 | <<locked>> | 86% | 44,527 psi | 86% | 2536 fps | 99.5% |
| Lovex S065 | <<locked>> | 82% | 44,106 psi | 86% | 2477 fps | 98.4% |
| Lovex S070 | <<locked>> | 84% | 44,744 psi | 87% | 2507 fps | 97.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,919 psi | 89% | 2559 fps | 98.5% |
| Norma MRP | <<locked>> | 92% | 43,700 psi | 85% | 2625 fps | 97.2% |
| Norma URP | <<locked>> | 86% | 45,672 psi | 89% | 2572 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 44,396 psi | 86% | 2566 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 98% | 43,947 psi | 85% | 2582 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,405 psi | 73% | 1683 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 46,166 psi | 90% | 2605 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 44,599 psi | 87% | 2615 fps | 99.2% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,279 psi | 84% | 2651 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 92% | 46,093 psi | 90% | 2595 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 82% | 44,991 psi | 87% | 2490 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 82% | 44,106 psi | 86% | 2477 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 84% | 44,744 psi | 87% | 2507 fps | 97.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 45,745 psi | 89% | 2467 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 45,658 psi | 89% | 2589 fps | 96.3% |
| Somchem S365 | <<locked>> | 88% | 44,643 psi | 87% | 2585 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 44,106 psi | 86% | 2530 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 82% | 46,253 psi | 90% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 44,469 psi | 86% | 2516 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 96% | 45,934 psi | 89% | 2552 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 84% | 44,092 psi | 86% | 2526 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 92% | 44,773 psi | 87% | 2595 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 46,572 psi | 90% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 45,469 psi | 88% | 2575 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,021 psi | 89% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,325 psi | 90% | 2562 fps | 96.1% |
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>> | 84% | 33,054 psi | 64% | 2303 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 38,957 psi | 76% | 2441 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,275 psi | 72% | 2438 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,814 psi | 81% | 2552 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,742 psi | 81% | 2552 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,282 psi | 55% | 2234 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,228 psi | 65% | 2379 fps | 95.4% |
| Alliant Reloder-26 | 41.4 gr | 82% | 31,807 psi | 62% | 2385 fps | 95.8% |
| Bofors RP15 | <<locked>> | 96% | 43,671 psi | 85% | 2592 fps | 95.5% |
| Bofors RP5 | <<locked>> | 92% | 41,742 psi | 81% | 2552 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,511 psi | 83% | 2441 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 80% | 40,248 psi | 78% | 2474 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 42,888 psi | 83% | 2484 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,925 psi | 68% | 2339 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,133 psi | 80% | 2605 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 39,044 psi | 76% | 2480 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 54% | 1470 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 40,234 psi | 78% | 2421 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,352 psi | 84% | 2461 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 37,130 psi | 72% | 2392 fps | 98.2% |
| Lovex S065 | <<locked>> | 80% | 41,655 psi | 81% | 2428 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 39,958 psi | 78% | 2411 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 34,360 psi | 67% | 2333 fps | 95.5% |
| Norma MRP | 43.1 gr | 88% | 38,450 psi | 75% | 2513 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,261 psi | 74% | 2428 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 80% | 36,927 psi | 72% | 2415 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 41,133 psi | 80% | 2526 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 55% | 1506 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,145 psi | 74% | 2451 fps | 98.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,825 psi | 72% | 2451 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,174 psi | 74% | 2533 fps | 95% |
| Rottweil R 905 | <<locked>> | 90% | 43,091 psi | 84% | 2539 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,511 psi | 83% | 2441 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,655 psi | 81% | 2428 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 80% | 39,958 psi | 78% | 2411 fps | 96.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,785 psi | 79% | 2375 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,757 psi | 83% | 2536 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 34,867 psi | 68% | 2395 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 39,117 psi | 76% | 2431 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 43,671 psi | 85% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,523 psi | 77% | 2425 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 40,625 psi | 79% | 2454 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 39,131 psi | 76% | 2431 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,908 psi | 60% | 2303 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,334 psi | 74% | 2392 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,248 psi | 78% | 2474 fps | 96.4% |
| Winchester StaBALL HD | 38.8 gr | 80% | 25,309 psi | 49% | 2211 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,308 psi | 84% | 2510 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 48 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 140gr | Barnes X S. Winchester StaBALL HD delivers the highest muzzle velocity at 2,766 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,766 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 48 of the 48 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 140.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Hodgdon Retumbo, 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, Winchester StaBALL HD, Norma MRP rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 140gr | 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.