Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 142gr | Sierra MatchKing bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP 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>> | 96% | 43,801 psi | 85% | 2530 fps | 98.3% |
| Accurate 4350 | <<locked>> | 88% | 46,108 psi | 90% | 2579 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 44,556 psi | 87% | 2562 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 44,396 psi | 86% | 2585 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 44,715 psi | 87% | 2605 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,859 psi | 85% | 2598 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 98% | 44,454 psi | 86% | 2605 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,495 psi | 81% | 2579 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 43,424 psi | 84% | 2657 fps | 99.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,006 psi | 89% | 2638 fps | 96.4% |
| Bofors RP5 | <<locked>> | 96% | 43,859 psi | 85% | 2598 fps | 96% |
| Bofors RP7 | <<locked>> | 84% | 44,730 psi | 87% | 2487 fps | 97% |
| Hodgdon H414 | <<locked>> | 86% | 45,266 psi | 88% | 2572 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 84% | 45,774 psi | 89% | 2539 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 44,498 psi | 86% | 2526 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 44,440 psi | 86% | 2592 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 70% | 1627 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 45,368 psi | 88% | 2520 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 46,369 psi | 90% | 2516 fps | 97.8% |
| IMR 4831 | <<locked>> | 88% | 43,874 psi | 85% | 2526 fps | 99.5% |
| Lovex S065 | <<locked>> | 86% | 46,238 psi | 90% | 2516 fps | 98.9% |
| Lovex S070 | <<locked>> | 86% | 44,164 psi | 86% | 2500 fps | 97.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,989 psi | 82% | 2493 fps | 97.9% |
| Norma 204 | <<locked>> | 88% | 44,962 psi | 87% | 2549 fps | 95.8% |
| Norma MRP | <<locked>> | 96% | 46,296 psi | 90% | 2674 fps | 98% |
| Norma URP | <<locked>> | 88% | 45,701 psi | 89% | 2572 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 88% | 44,121 psi | 86% | 2562 fps | 98.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,613 psi | 85% | 2575 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 71% | 1667 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 44,338 psi | 86% | 2602 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 45,934 psi | 89% | 2602 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 44,715 psi | 87% | 2618 fps | 99.3% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,277 psi | 78% | 2585 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 82% | 44,889 psi | 87% | 2507 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 45,876 psi | 89% | 2592 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 84% | 44,730 psi | 87% | 2487 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 86% | 46,238 psi | 90% | 2516 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 86% | 44,164 psi | 86% | 2500 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 46,108 psi | 90% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 46,325 psi | 90% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,745 psi | 89% | 2470 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,455 psi | 88% | 2585 fps | 96.4% |
| Somchem S355 | <<locked>> | 82% | 45,281 psi | 88% | 2507 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 44,150 psi | 86% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 46,543 psi | 90% | 2572 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 84% | 45,992 psi | 89% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 44,498 psi | 86% | 2520 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 98% | 45,745 psi | 89% | 2549 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 86% | 43,569 psi | 85% | 2520 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 94% | 43,424 psi | 84% | 2575 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 46,586 psi | 90% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 45,571 psi | 89% | 2579 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,496 psi | 83% | 2697 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,267 psi | 90% | 2562 fps | 96.3% |
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>> | 88% | 33,547 psi | 65% | 2323 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 35,157 psi | 68% | 2369 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 41,611 psi | 81% | 2503 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,592 psi | 67% | 2379 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,885 psi | 76% | 2497 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,220 psi | 80% | 2546 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,338 psi | 49% | 2152 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,198 psi | 63% | 2359 fps | 95.1% |
| Alliant Reloder-26 | 42.2 gr | 84% | 30,603 psi | 59% | 2359 fps | 95.4% |
| Bofors RP15 | <<locked>> | 98% | 43,250 psi | 84% | 2585 fps | 95.6% |
| Bofors RP5 | <<locked>> | 94% | 41,220 psi | 80% | 2546 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,581 psi | 77% | 2385 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 36,985 psi | 72% | 2408 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 80% | 40,219 psi | 78% | 2434 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,169 psi | 62% | 2283 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 82% | 38,754 psi | 75% | 2477 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 53% | 1457 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 37,550 psi | 73% | 2369 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,857 psi | 79% | 2415 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 33,808 psi | 66% | 2326 fps | 97.4% |
| Lovex S065 | <<locked>> | 80% | 38,595 psi | 75% | 2372 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 36,753 psi | 71% | 2352 fps | 95.6% |
| Lovex S071 | <<locked>> | 94% | 34,534 psi | 67% | 2346 fps | 95.8% |
| Norma 204 | <<locked>> | 86% | 42,264 psi | 82% | 2500 fps | 95% |
| Norma MRP | 43.9 gr | 90% | 37,869 psi | 74% | 2503 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,172 psi | 68% | 2365 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 34,040 psi | 66% | 2352 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 40,582 psi | 79% | 2516 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 53% | 1490 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,321 psi | 80% | 2549 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,853 psi | 68% | 2385 fps | 97.3% |
| ReloadSwiss RS 70 | 39.8 gr | 80% | 34,040 psi | 66% | 2385 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,608 psi | 73% | 2523 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 42,105 psi | 82% | 2457 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 42,728 psi | 83% | 2533 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 39,581 psi | 77% | 2385 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,595 psi | 75% | 2372 fps | 97.3% |
| Shooters World SW4350 | <<locked>> | 80% | 36,753 psi | 71% | 2352 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,033 psi | 84% | 2507 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,511 psi | 85% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,478 psi | 73% | 2313 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,322 psi | 82% | 2530 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 42,569 psi | 83% | 2461 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 31,662 psi | 61% | 2326 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 38,406 psi | 75% | 2418 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 40,611 psi | 79% | 2395 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,550 psi | 71% | 2365 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 94% | 40,045 psi | 78% | 2444 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 35,969 psi | 70% | 2369 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 27,369 psi | 53% | 2218 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,650 psi | 69% | 2339 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 37,260 psi | 72% | 2415 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,237 psi | 49% | 2224 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,076 psi | 84% | 2507 fps | 95.4% |
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 54 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 142gr | Sierra MatchKing. Winchester StaBALL HD delivers the highest muzzle velocity at 2,697 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,697 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 54 of the 54 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 142.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Bofors RP15, 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, Norma MRP, ReloadSwiss RS 70 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 142gr | Sierra MatchKing 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.