Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 128gr | MRR Green Long Range 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, ReloadSwiss RS 70 and ReloadSwiss RS 62.
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 3100ᴾ | <<locked>> | 100% | 45,382 psi | 88% | 2677 fps | 97.6% |
| Accurate 4064 | <<locked>> | 82% | 45,701 psi | 89% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 44,672 psi | 87% | 2684 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 82% | 43,801 psi | 85% | 2592 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,845 psi | 85% | 2615 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 46,543 psi | 90% | 2749 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,497 psi | 84% | 2713 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,975 psi | 83% | 2703 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 45,049 psi | 87% | 2812 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 43,729 psi | 85% | 2621 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 44,338 psi | 86% | 2628 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 88% | 44,353 psi | 86% | 2680 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 46,151 psi | 90% | 2684 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 70% | 1713 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 46,064 psi | 89% | 2625 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,861 psi | 89% | 2628 fps | 96.5% |
| IMR 4831 | <<locked>> | 92% | 45,716 psi | 89% | 2687 fps | 99% |
| Lovex S062 | <<locked>> | 82% | 46,151 psi | 90% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 45,498 psi | 88% | 2625 fps | 97.9% |
| Lovex S070 | <<locked>> | 90% | 46,282 psi | 90% | 2661 fps | 97% |
| Norma 203B | <<locked>> | 82% | 46,224 psi | 90% | 2667 fps | 99.7% |
| Norma MRP | <<locked>> | 98% | 45,049 psi | 87% | 2769 fps | 96.4% |
| Norma URP | <<locked>> | 90% | 44,454 psi | 86% | 2677 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 82% | 46,180 psi | 90% | 2687 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 92% | 46,238 psi | 90% | 2723 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 71% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,556 psi | 87% | 2608 fps | 97% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 46,311 psi | 90% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 44,628 psi | 87% | 2707 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,859 psi | 85% | 2720 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 84% | 43,918 psi | 85% | 2618 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 45,498 psi | 88% | 2625 fps | 97.9% |
| Shooters World Precision | <<locked>> | 82% | 46,151 psi | 90% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 46,282 psi | 90% | 2661 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 45,063 psi | 88% | 2671 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 45,992 psi | 89% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,121 psi | 88% | 2575 fps | 96.5% |
| Somchem S355 | <<locked>> | 84% | 44,541 psi | 87% | 2621 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 45,774 psi | 89% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 45,150 psi | 88% | 2667 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 86% | 45,208 psi | 88% | 2602 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 46,253 psi | 90% | 2674 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 46,470 psi | 90% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 45,730 psi | 89% | 2680 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 98% | 44,744 psi | 87% | 2730 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 45,876 psi | 89% | 2651 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 44,353 psi | 86% | 2680 fps | 96.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,696 psi | 75% | 2730 fps | 99.9% |
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>> | 94% | 36,985 psi | 72% | 2513 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 42,641 psi | 83% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,836 psi | 62% | 2408 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 41,205 psi | 80% | 2539 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,901 psi | 79% | 2559 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,937 psi | 62% | 2418 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,621 psi | 69% | 2543 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,847 psi | 54% | 2333 fps | 95% |
| Alliant Reloder-26 | 45.3 gr | 90% | 34,055 psi | 66% | 2559 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 41,060 psi | 80% | 2572 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 41,684 psi | 81% | 2575 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 41,423 psi | 80% | 2621 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,240 psi | 57% | 2320 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 52% | 1526 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,308 psi | 84% | 2575 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,422 psi | 79% | 2520 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 32,851 psi | 64% | 2418 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 43,120 psi | 84% | 2572 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,491 psi | 69% | 2418 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 40,756 psi | 79% | 2552 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 43,497 psi | 84% | 2615 fps | 99.4% |
| Norma MRP | <<locked>> | 96% | 42,032 psi | 82% | 2710 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 32,126 psi | 62% | 2411 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,134 psi | 84% | 2631 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 37,971 psi | 74% | 2556 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,253 psi | 53% | 1568 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,945 psi | 81% | 2559 fps | 96.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,884 psi | 74% | 2605 fps | 100% |
| ReloadSwiss RS 62 | 40.2 gr | 82% | 33,605 psi | 65% | 2474 fps | 95.5% |
| ReloadSwiss RS 70 | 41.9 gr | 84% | 35,795 psi | 70% | 2539 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 38,682 psi | 75% | 2520 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,491 psi | 69% | 2418 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 43,120 psi | 84% | 2572 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 40,756 psi | 79% | 2552 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,552 psi | 77% | 2566 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,538 psi | 79% | 2451 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,409 psi | 82% | 2523 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 39,059 psi | 76% | 2516 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 28,805 psi | 56% | 2365 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 42,409 psi | 82% | 2618 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 37,434 psi | 73% | 2457 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,460 psi | 65% | 2415 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 43,729 psi | 85% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,938 psi | 64% | 2411 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 86% | 30,153 psi | 59% | 2408 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,909 psi | 64% | 2385 fps | 97.7% |
| Winchester 760 | <<locked>> | 86% | 41,698 psi | 81% | 2628 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,862 psi | 54% | 2405 fps | 95.5% |
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 | 128gr | MRR Green Long Range. Alliant Reloder-26 delivers the highest muzzle velocity at 2,812 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,812 fps. Accurate 3100 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 70–90 %, leaving at least 10 % headroom. The 128.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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, ReloadSwiss RS 70, ReloadSwiss RS 62 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 128gr | MRR Green Long Range 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.