Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 120gr | Impala RNFP KO bullet and 35 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Somchem S365.
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% | 45,281 psi | 88% | 2736 fps | 96.9% |
| Accurate 4350 | <<locked>> | 88% | 44,527 psi | 86% | 2746 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 82% | 45,484 psi | 88% | 2690 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 45,890 psi | 89% | 2720 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 45,237 psi | 88% | 2792 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 45,440 psi | 88% | 2818 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,078 psi | 88% | 2812 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 44,106 psi | 86% | 2858 fps | 98.1% |
| Bofors RP3 | <<locked>> | 82% | 46,195 psi | 90% | 2733 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 88% | 46,238 psi | 90% | 2782 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 45,208 psi | 88% | 2736 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,260 psi | 70% | 1775 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 45,194 psi | 88% | 2743 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 44,976 psi | 87% | 2677 fps | 97.2% |
| Lovex S070 | <<locked>> | 88% | 45,585 psi | 89% | 2710 fps | 96.2% |
| Norma URP | <<locked>> | 90% | 46,485 psi | 90% | 2782 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 45,005 psi | 87% | 2769 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 72% | 1818 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 45,107 psi | 88% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 43,758 psi | 85% | 2756 fps | 97.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 45,556 psi | 88% | 2822 fps | 98% |
| Rottweil R 903 | <<locked>> | 84% | 46,369 psi | 90% | 2730 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 44,976 psi | 87% | 2677 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 88% | 45,585 psi | 89% | 2710 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 44,121 psi | 86% | 2723 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 45,049 psi | 87% | 2595 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 44,106 psi | 86% | 2677 fps | 99.4% |
| Somchem S365 | <<locked>> | 92% | 44,962 psi | 87% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 44,483 psi | 86% | 2654 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 88% | 45,426 psi | 88% | 2726 fps | 98.4% |
| Vihtavuori N550 | <<locked>> | 88% | 44,846 psi | 87% | 2733 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 96% | 44,367 psi | 86% | 2789 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 44,831 psi | 87% | 2700 fps | 99.7% |
| Winchester 760 | <<locked>> | 88% | 46,238 psi | 90% | 2782 fps | 96.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,843 psi | 79% | 2841 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% | 39,668 psi | 77% | 2628 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 34,592 psi | 67% | 2530 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 42,743 psi | 83% | 2638 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,076 psi | 84% | 2667 fps | 99.5% |
| Alliant Reloder-16 | 37.3 gr | 80% | 33,895 psi | 66% | 2526 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,521 psi | 73% | 2648 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,023 psi | 58% | 2444 fps | 95.3% |
| Alliant Reloder-26 | 46.3 gr | 90% | 36,521 psi | 71% | 2677 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 43,598 psi | 85% | 2684 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 86% | 43,410 psi | 84% | 2723 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,473 psi | 61% | 2431 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 53% | 1588 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 33,185 psi | 64% | 2480 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 37,840 psi | 73% | 2526 fps | 95.1% |
| Lovex S070 | <<locked>> | 86% | 43,163 psi | 84% | 2661 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 34,098 psi | 66% | 2516 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 86% | 40,001 psi | 78% | 2661 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 54% | 1624 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,711 psi | 77% | 2710 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,042 psi | 70% | 2592 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 37,782 psi | 73% | 2644 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 41,017 psi | 80% | 2625 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,840 psi | 73% | 2526 fps | 95.1% |
| Shooters World SW4350 | <<locked>> | 86% | 43,163 psi | 84% | 2661 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,437 psi | 80% | 2667 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,467 psi | 82% | 2549 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,423 psi | 80% | 2625 fps | 99% |
| Somchem S365 | 38 gr | 80% | 30,922 psi | 60% | 2474 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 39,421 psi | 77% | 2559 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 35,505 psi | 69% | 2520 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 35,172 psi | 68% | 2523 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 86% | 32,663 psi | 63% | 2526 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,925 psi | 68% | 2490 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 43,410 psi | 84% | 2723 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,211 psi | 59% | 2530 fps | 96% |
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 35 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 120gr | Impala RNFP KO. Alliant Reloder-26 delivers the highest muzzle velocity at 2,858 fps; across all powders the maximum-charge window runs from 1,775 fps to 2,858 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 35 of the 35 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 120.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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, Alliant Reloder-16, Somchem S365 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 120gr | Impala RNFP KO 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.