Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .263 | 120gr | Rhino Penetrator bullet and 46 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 3100ᴾ | <<locked>> | 100% | 44,048 psi | 86% | 2736 fps | 96.7% |
| Accurate 4064 | <<locked>> | 82% | 44,396 psi | 86% | 2690 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 43,453 psi | 84% | 2749 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 84% | 45,687 psi | 89% | 2713 fps | 98.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 46,557 psi | 90% | 2861 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 45,585 psi | 89% | 2736 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 45,890 psi | 89% | 2753 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 45,194 psi | 88% | 2812 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 45,455 psi | 88% | 2838 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,930 psi | 81% | 2769 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,888 psi | 85% | 2871 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 45,701 psi | 89% | 2746 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 46,325 psi | 90% | 2749 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 90% | 46,311 psi | 90% | 2802 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 44,976 psi | 87% | 2753 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 69% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 44,947 psi | 87% | 2694 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 44,527 psi | 86% | 2753 fps | 98.5% |
| Lovex S062 | <<locked>> | 82% | 44,991 psi | 87% | 2697 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 44,425 psi | 86% | 2690 fps | 97.1% |
| Lovex S070 | <<locked>> | 90% | 45,339 psi | 88% | 2726 fps | 96.2% |
| Norma 203B | <<locked>> | 82% | 45,208 psi | 88% | 2736 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 46,180 psi | 90% | 2799 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 82% | 45,208 psi | 88% | 2756 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 44,947 psi | 87% | 2785 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 70% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,816 psi | 85% | 2680 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 45,237 psi | 88% | 2844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 46,383 psi | 90% | 2828 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 45,905 psi | 89% | 2844 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 86% | 45,919 psi | 89% | 2743 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,425 psi | 86% | 2690 fps | 97.1% |
| Shooters World Precision | <<locked>> | 82% | 44,991 psi | 87% | 2697 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 45,339 psi | 88% | 2726 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 44,150 psi | 86% | 2743 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 44,918 psi | 87% | 2612 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 46,267 psi | 90% | 2743 fps | 99.6% |
| Somchem S365 | <<locked>> | 94% | 44,382 psi | 86% | 2805 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 44,396 psi | 86% | 2677 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 45,136 psi | 88% | 2743 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 45,469 psi | 88% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 44,628 psi | 87% | 2746 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,398 psi | 90% | 2844 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 44,918 psi | 87% | 2720 fps | 99.7% |
| Winchester 760 | <<locked>> | 90% | 46,311 psi | 90% | 2802 fps | 96.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,594 psi | 73% | 2779 fps | 99.4% |
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>> | 96% | 38,464 psi | 75% | 2625 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 41,785 psi | 81% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,083 psi | 64% | 2520 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 40,263 psi | 78% | 2605 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,250 psi | 84% | 2795 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,147 psi | 78% | 2631 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,946 psi | 83% | 2694 fps | 98.6% |
| Alliant Reloder-16 | 38.4 gr | 82% | 33,040 psi | 64% | 2526 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,737 psi | 67% | 2598 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,734 psi | 60% | 2493 fps | 95.8% |
| Alliant Reloder-26 | 47.6 gr | 92% | 35,491 psi | 69% | 2671 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 39,842 psi | 77% | 2631 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 40,785 psi | 79% | 2641 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 43,294 psi | 84% | 2743 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,660 psi | 56% | 2375 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 52% | 1588 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,308 psi | 82% | 2641 fps | 98.6% |
| IMR 4831 | <<locked>> | 84% | 34,301 psi | 67% | 2533 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 42,380 psi | 82% | 2644 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 39,508 psi | 77% | 2589 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 42,438 psi | 82% | 2667 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 42,337 psi | 82% | 2680 fps | 98.9% |
| Norma URP | <<locked>> | 84% | 35,563 psi | 69% | 2575 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 41,989 psi | 82% | 2694 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 39,392 psi | 77% | 2667 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 52% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,046 psi | 80% | 2621 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,927 psi | 72% | 2667 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,172 psi | 68% | 2592 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,405 psi | 73% | 2654 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 37,594 psi | 73% | 2579 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,508 psi | 77% | 2589 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 42,380 psi | 82% | 2644 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,438 psi | 82% | 2667 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,609 psi | 75% | 2628 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,697 psi | 77% | 2520 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,348 psi | 74% | 2585 fps | 98.5% |
| Somchem S365 | 38.3 gr | 80% | 27,949 psi | 54% | 2411 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 36,434 psi | 71% | 2516 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 34,766 psi | 68% | 2523 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 42,859 psi | 83% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,142 psi | 66% | 2520 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 33,373 psi | 65% | 2569 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,126 psi | 62% | 2441 fps | 96.8% |
| Winchester 760 | <<locked>> | 88% | 43,294 psi | 84% | 2743 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,950 psi | 56% | 2510 fps | 95.2% |
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 46 powders for 6.5 x 58 mm Mauser Port. loaded with the .263 | 120gr | Rhino Penetrator. Alliant Reloder-26 delivers the highest muzzle velocity at 2,871 fps; across all powders the maximum-charge window runs from 1,775 fps to 2,871 fps. Accurate 3100 gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.263" calls for a 1:9.5 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, Alliant Reloder-16, Somchem S365 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .263 | 120gr | Rhino Penetrator 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.