Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 140gr | Berger BT Target bullet and 52 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>> | 98% | 45,919 psi | 89% | 2579 fps | 98.5% |
| Accurate 4350 | <<locked>> | 88% | 45,237 psi | 88% | 2582 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 82% | 46,354 psi | 90% | 2526 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 94% | 46,456 psi | 90% | 2612 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 90% | 46,441 psi | 90% | 2635 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 84% | 43,642 psi | 85% | 2602 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,021 psi | 89% | 2605 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,934 psi | 89% | 2651 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,485 psi | 90% | 2654 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,538 psi | 79% | 2572 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 45,759 psi | 89% | 2717 fps | 99.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,208 psi | 88% | 2638 fps | 95.9% |
| Bofors RP5 | <<locked>> | 98% | 45,934 psi | 89% | 2651 fps | 96.3% |
| Bofors RP7 | <<locked>> | 84% | 44,048 psi | 86% | 2487 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 86% | 44,454 psi | 86% | 2572 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 84% | 45,063 psi | 88% | 2539 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 43,714 psi | 85% | 2530 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,714 psi | 85% | 2592 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 71% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 44,657 psi | 87% | 2523 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,701 psi | 89% | 2520 fps | 97.5% |
| IMR 4831 | <<locked>> | 90% | 46,195 psi | 90% | 2582 fps | 99.6% |
| Lovex S065 | <<locked>> | 86% | 45,527 psi | 88% | 2520 fps | 98.7% |
| Lovex S070 | <<locked>> | 88% | 46,166 psi | 90% | 2549 fps | 97.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,843 psi | 79% | 2490 fps | 97.5% |
| Norma MRP | <<locked>> | 96% | 45,513 psi | 88% | 2674 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 44,556 psi | 87% | 2569 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 90% | 46,470 psi | 90% | 2618 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,941 psi | 72% | 1680 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 46,412 psi | 90% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 44,773 psi | 87% | 2598 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 43,976 psi | 85% | 2618 fps | 99% |
| Rottweil R 903 | <<locked>> | 82% | 44,092 psi | 86% | 2510 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 44,744 psi | 87% | 2585 fps | 96% |
| Rottweil R 907 | <<locked>> | 84% | 44,048 psi | 86% | 2487 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 45,527 psi | 88% | 2520 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 88% | 46,166 psi | 90% | 2549 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 45,034 psi | 87% | 2559 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 45,658 psi | 89% | 2421 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,078 psi | 88% | 2470 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,324 psi | 86% | 2579 fps | 95.9% |
| Somchem S355 | <<locked>> | 82% | 44,541 psi | 87% | 2510 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 46,238 psi | 90% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 45,788 psi | 89% | 2572 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 84% | 45,252 psi | 88% | 2490 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 46,586 psi | 90% | 2569 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 98% | 44,657 psi | 87% | 2543 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 88% | 45,861 psi | 89% | 2575 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 96% | 45,426 psi | 88% | 2625 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 45,890 psi | 89% | 2543 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,759 psi | 87% | 2579 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,756 psi | 81% | 2697 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% | 2372 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 34,461 psi | 67% | 2369 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 80% | 43,569 psi | 85% | 2477 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 43,656 psi | 85% | 2559 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,982 psi | 66% | 2379 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,189 psi | 74% | 2497 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,294 psi | 84% | 2556 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,120 psi | 84% | 2595 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,440 psi | 51% | 2198 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,605 psi | 65% | 2408 fps | 95.5% |
| Alliant Reloder-26 | 43 gr | 86% | 32,155 psi | 62% | 2415 fps | 95.9% |
| Bofors RP15 | <<locked>> | 98% | 42,235 psi | 82% | 2579 fps | 95% |
| Bofors RP5 | <<locked>> | 96% | 43,120 psi | 84% | 2595 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 38,943 psi | 76% | 2388 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 36,303 psi | 71% | 2408 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 42,090 psi | 82% | 2484 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,575 psi | 61% | 2283 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 84% | 40,814 psi | 79% | 2533 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 52% | 1460 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 39,262 psi | 76% | 2418 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,219 psi | 78% | 2415 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 33,156 psi | 64% | 2323 fps | 97% |
| Lovex S065 | <<locked>> | 80% | 37,942 psi | 74% | 2372 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 36,143 psi | 70% | 2352 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 33,866 psi | 66% | 2346 fps | 95.3% |
| Norma MRP | 44.6 gr | 92% | 39,581 psi | 77% | 2556 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,519 psi | 67% | 2369 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 82% | 35,549 psi | 69% | 2402 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 54% | 1499 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,596 psi | 79% | 2549 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,142 psi | 66% | 2385 fps | 96.9% |
| ReloadSwiss RS 70 | 39.6 gr | 80% | 33,475 psi | 65% | 2385 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 41,336 psi | 80% | 2461 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 92% | 41,974 psi | 82% | 2533 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 38,943 psi | 76% | 2388 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,942 psi | 74% | 2372 fps | 97% |
| Shooters World SW4350 | <<locked>> | 80% | 36,143 psi | 70% | 2352 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,293 psi | 82% | 2510 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,163 psi | 84% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,144 psi | 72% | 2320 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 41,568 psi | 81% | 2526 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 41,887 psi | 81% | 2461 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,009 psi | 60% | 2326 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 40,147 psi | 78% | 2470 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 39,900 psi | 77% | 2398 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,868 psi | 70% | 2365 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 41,930 psi | 81% | 2493 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 35,317 psi | 69% | 2369 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 28,790 psi | 56% | 2270 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,085 psi | 68% | 2343 fps | 99.1% |
| Winchester 760 | <<locked>> | 80% | 36,579 psi | 71% | 2415 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,484 psi | 51% | 2280 fps | 96.4% |
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 52 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 140gr | Berger BT Target. Alliant Reloder-26 delivers the highest muzzle velocity at 2,717 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,717 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 52 of the 52 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 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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 | 140gr | Berger BT Target 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.