Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 140gr | Berger LRBT 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% | 46,485 psi | 90% | 2589 fps | 98.6% |
| Accurate 4350 | <<locked>> | 88% | 45,484 psi | 88% | 2585 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 43,874 psi | 85% | 2592 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 44,164 psi | 86% | 2615 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,209 psi | 90% | 2612 fps | 96.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,412 psi | 90% | 2661 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 98% | 43,845 psi | 85% | 2612 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,959 psi | 80% | 2582 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 45,919 psi | 89% | 2723 fps | 99.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,397 psi | 88% | 2641 fps | 96% |
| Bofors RP5 | <<locked>> | 98% | 46,412 psi | 90% | 2661 fps | 96.5% |
| Bofors RP7 | <<locked>> | 84% | 44,266 psi | 86% | 2493 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 86% | 44,701 psi | 87% | 2579 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 84% | 45,266 psi | 88% | 2546 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 43,918 psi | 85% | 2533 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,874 psi | 85% | 2595 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,085 psi | 70% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 44,860 psi | 87% | 2526 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,905 psi | 89% | 2526 fps | 97.6% |
| IMR 4831 | <<locked>> | 90% | 46,412 psi | 90% | 2589 fps | 99.6% |
| Lovex S065 | <<locked>> | 86% | 45,730 psi | 89% | 2523 fps | 98.7% |
| Lovex S070 | <<locked>> | 86% | 43,656 psi | 85% | 2507 fps | 97.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,379 psi | 80% | 2500 fps | 97.6% |
| Norma MRP | <<locked>> | 96% | 45,658 psi | 89% | 2680 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 45,121 psi | 88% | 2582 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 43,555 psi | 85% | 2569 fps | 98.1% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,018 psi | 84% | 2579 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 71% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 43,787 psi | 85% | 2612 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 45,295 psi | 88% | 2608 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 44,150 psi | 86% | 2625 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 82% | 44,353 psi | 86% | 2516 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 45,266 psi | 88% | 2598 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 84% | 44,266 psi | 86% | 2493 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 45,730 psi | 89% | 2523 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 86% | 43,656 psi | 85% | 2507 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 45,556 psi | 88% | 2569 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 45,861 psi | 89% | 2428 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,252 psi | 88% | 2477 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,875 psi | 87% | 2592 fps | 96.1% |
| Somchem S355 | <<locked>> | 82% | 44,788 psi | 87% | 2516 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 46,441 psi | 90% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 45,934 psi | 89% | 2579 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 84% | 45,498 psi | 88% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 43,947 psi | 85% | 2526 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 98% | 45,136 psi | 88% | 2552 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 88% | 46,064 psi | 89% | 2579 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 96% | 45,963 psi | 89% | 2635 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 46,035 psi | 89% | 2549 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 45,005 psi | 87% | 2585 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,901 psi | 81% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,672 psi | 89% | 2566 fps | 95.9% |
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% | 33,054 psi | 64% | 2326 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 34,664 psi | 67% | 2375 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,185 psi | 66% | 2385 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,406 psi | 75% | 2503 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,482 psi | 84% | 2559 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,279 psi | 84% | 2602 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,600 psi | 52% | 2205 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,968 psi | 66% | 2418 fps | 95.7% |
| Alliant Reloder-26 | 43.2 gr | 86% | 32,329 psi | 63% | 2421 fps | 96.1% |
| Bofors RP15 | <<locked>> | 98% | 42,685 psi | 83% | 2589 fps | 95.2% |
| Bofors RP5 | <<locked>> | 96% | 43,279 psi | 84% | 2602 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,160 psi | 76% | 2392 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 36,521 psi | 71% | 2415 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 42,308 psi | 82% | 2490 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,763 psi | 62% | 2290 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 82% | 38,276 psi | 74% | 2480 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 53% | 1467 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 39,479 psi | 77% | 2425 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,437 psi | 79% | 2421 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 33,359 psi | 65% | 2329 fps | 97% |
| Lovex S065 | <<locked>> | 80% | 38,174 psi | 74% | 2379 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 36,332 psi | 71% | 2359 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 34,026 psi | 66% | 2349 fps | 95.4% |
| Norma MRP | 43.9 gr | 90% | 37,362 psi | 73% | 2507 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 34,722 psi | 67% | 2375 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 80% | 33,620 psi | 65% | 2356 fps | 95% |
| Ramshot Magnum | <<locked>> | 98% | 40,059 psi | 78% | 2520 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 53% | 1499 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,814 psi | 79% | 2556 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,360 psi | 67% | 2392 fps | 97% |
| ReloadSwiss RS 70 | 39.8 gr | 80% | 33,620 psi | 65% | 2388 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 41,611 psi | 81% | 2467 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 42,163 psi | 82% | 2539 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 39,160 psi | 76% | 2392 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,174 psi | 74% | 2379 fps | 97.1% |
| Shooters World SW4350 | <<locked>> | 80% | 36,332 psi | 71% | 2359 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,525 psi | 83% | 2513 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,076 psi | 84% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,333 psi | 73% | 2326 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 41,756 psi | 81% | 2533 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 42,105 psi | 82% | 2467 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,227 psi | 61% | 2333 fps | 99.2% |
| Somchem S385 | <<locked>> | 90% | 40,321 psi | 78% | 2474 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 40,147 psi | 78% | 2405 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,085 psi | 70% | 2372 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 96% | 42,090 psi | 82% | 2500 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 35,520 psi | 69% | 2372 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 29,008 psi | 56% | 2277 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,230 psi | 68% | 2346 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 36,782 psi | 71% | 2421 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,918 psi | 48% | 2221 fps | 95.1% |
| Winchester Supreme 780 | <<locked>> | 94% | 42,525 psi | 83% | 2510 fps | 95% |
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 LRBT Target. Alliant Reloder-26 delivers the highest muzzle velocity at 2,723 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,723 fps. Alliant Reloder-25 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 70–90 %, 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-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 | 140gr | Berger LRBT 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.