Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .257 | 115gr | Federal Trophy Bonded bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-17.
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 2495 | <<locked>> | 84% | 45,977 psi | 89% | 2726 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 46,195 psi | 90% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 44,976 psi | 87% | 2815 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 44,991 psi | 87% | 2736 fps | 98.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 45,527 psi | 88% | 2874 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 44,628 psi | 87% | 2759 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 84% | 44,933 psi | 87% | 2769 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,266 psi | 86% | 2828 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,469 psi | 86% | 2858 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,159 psi | 74% | 2717 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,424 psi | 82% | 2871 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 46,151 psi | 90% | 2789 fps | 98.1% |
| Bofors RP3 | <<locked>> | 86% | 44,657 psi | 87% | 2769 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 45,527 psi | 88% | 2772 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 46,499 psi | 90% | 2818 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 45,905 psi | 89% | 2822 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 69% | 1788 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 45,339 psi | 88% | 2749 fps | 99.1% |
| IMR 4064 | <<locked>> | 84% | 44,396 psi | 86% | 2717 fps | 98.3% |
| IMR 4831 | <<locked>> | 96% | 45,905 psi | 89% | 2818 fps | 98.1% |
| IMR 4895 | <<locked>> | 84% | 46,079 psi | 89% | 2802 fps | 99% |
| Lovex D073.6 | <<locked>> | 82% | 46,079 psi | 89% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 44,324 psi | 86% | 2723 fps | 99.5% |
| Lovex S065 | <<locked>> | 92% | 46,557 psi | 90% | 2762 fps | 96.8% |
| Norma 201 | <<locked>> | 82% | 45,788 psi | 89% | 2736 fps | 99.6% |
| Norma 202 | <<locked>> | 82% | 46,079 psi | 89% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 84% | 44,251 psi | 86% | 2756 fps | 98.7% |
| Norma URP | <<locked>> | 94% | 44,657 psi | 87% | 2808 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 84% | 43,990 psi | 85% | 2772 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,926 psi | 70% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,905 psi | 89% | 2753 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,396 psi | 86% | 2822 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,193 psi | 86% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,831 psi | 87% | 2838 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,788 psi | 87% | 2851 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 84% | 46,151 psi | 90% | 2736 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 88% | 44,541 psi | 87% | 2759 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 46,557 psi | 90% | 2762 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 46,079 psi | 89% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 44,324 psi | 86% | 2723 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 46,035 psi | 89% | 2818 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 45,107 psi | 88% | 2749 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,469 psi | 86% | 2644 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 45,353 psi | 88% | 2762 fps | 99.2% |
| Somchem S365 | <<locked>> | 98% | 45,701 psi | 89% | 2871 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 84% | 45,614 psi | 89% | 2713 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 46,485 psi | 90% | 2726 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 46,137 psi | 90% | 2746 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 44,005 psi | 85% | 2759 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 84% | 44,962 psi | 87% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 46,398 psi | 90% | 2818 fps | 97.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,510 psi | 81% | 2799 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,164 psi | 86% | 2740 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,156 psi | 66% | 2697 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 82% | 44,860 psi | 87% | 2759 fps | 99.2% |
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 2495 | <<locked>> | 80% | 40,321 psi | 78% | 2625 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,145 psi | 74% | 2615 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 36,680 psi | 71% | 2644 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,260 psi | 72% | 2572 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,813 psi | 77% | 2753 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,854 psi | 72% | 2598 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,624 psi | 77% | 2661 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,738 psi | 71% | 2654 fps | 95.5% |
| Alliant Reloder-17 | 38.5 gr | 80% | 31,850 psi | 62% | 2552 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,705 psi | 62% | 2546 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 39,465 psi | 77% | 2799 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,062 psi | 84% | 2730 fps | 97.5% |
| Bofors RP3 | <<locked>> | 80% | 36,463 psi | 71% | 2598 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 80% | 37,333 psi | 73% | 2598 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 31,778 psi | 62% | 2497 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,103 psi | 78% | 2707 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 51% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,525 psi | 83% | 2694 fps | 98.7% |
| IMR 4064 | <<locked>> | 80% | 39,088 psi | 76% | 2608 fps | 97.1% |
| IMR 4831 | <<locked>> | 88% | 35,375 psi | 69% | 2598 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 40,567 psi | 79% | 2694 fps | 98% |
| Lovex D073.6 | <<locked>> | 80% | 42,888 psi | 83% | 2710 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 39,088 psi | 76% | 2618 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 41,147 psi | 80% | 2657 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,989 psi | 83% | 2684 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 43,265 psi | 84% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,986 psi | 76% | 2648 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 36,811 psi | 71% | 2641 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 38,508 psi | 75% | 2661 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 52% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,120 psi | 84% | 2697 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,524 psi | 81% | 2762 fps | 97.6% |
| ReloadSwiss RS 60 | 38.5 gr | 80% | 33,881 psi | 66% | 2621 fps | 98.7% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 39,088 psi | 76% | 2720 fps | 95.9% |
| ReloadSwiss RS 70 | 45 gr | 92% | 42,090 psi | 82% | 2792 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 40,959 psi | 80% | 2635 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 34,301 psi | 67% | 2539 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,147 psi | 80% | 2657 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,888 psi | 83% | 2710 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 39,088 psi | 76% | 2618 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,244 psi | 68% | 2589 fps | 96.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,366 psi | 82% | 2697 fps | 98.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,825 psi | 72% | 2503 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 35,186 psi | 68% | 2549 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 28,950 psi | 56% | 2474 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 40,292 psi | 78% | 2621 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,944 psi | 80% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,417 psi | 65% | 2487 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 86% | 36,056 psi | 70% | 2589 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 39,479 psi | 77% | 2615 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 37,869 psi | 74% | 2644 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 94% | 34,055 psi | 66% | 2628 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,792 psi | 62% | 2457 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,908 psi | 62% | 2625 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,829 psi | 81% | 2700 fps | 98.7% |
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 55 powders for 6.5 x 58 mm Mauser Port. loaded with the .257 | 115gr | Federal Trophy Bonded. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,874 fps; across all powders the maximum-charge window runs from 1,788 fps to 2,874 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 55 of the 55 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.264" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, 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. ReloadSwiss RS 60, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .257 | 115gr | Federal Trophy Bonded 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.