Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 115gr | Barnes TAC-TX BT bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, Somchem S365 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 2495 | <<locked>> | 84% | 46,209 psi | 90% | 2746 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 46,427 psi | 90% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 45,861 psi | 89% | 2851 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 86% | 45,571 psi | 89% | 2766 fps | 98.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,192 psi | 84% | 2848 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 45,136 psi | 88% | 2785 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 84% | 45,469 psi | 88% | 2802 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,904 psi | 87% | 2858 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 90% | 45,339 psi | 88% | 2894 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,566 psi | 75% | 2746 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,207 psi | 84% | 2907 fps | 97.4% |
| Bofors RP3 | <<locked>> | 86% | 44,976 psi | 87% | 2792 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 86% | 46,180 psi | 90% | 2805 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 44,440 psi | 86% | 2799 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,671 psi | 85% | 2795 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 69% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 46,035 psi | 89% | 2779 fps | 99.4% |
| IMR 4064 | <<locked>> | 84% | 45,063 psi | 88% | 2749 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 43,816 psi | 85% | 2795 fps | 97.9% |
| IMR 4895 | <<locked>> | 82% | 43,845 psi | 85% | 2779 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 82% | 46,543 psi | 90% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 44,817 psi | 87% | 2749 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 44,266 psi | 86% | 2740 fps | 96.5% |
| Norma 201 | <<locked>> | 82% | 45,977 psi | 89% | 2762 fps | 99.7% |
| Norma 203B | <<locked>> | 84% | 44,788 psi | 87% | 2789 fps | 99% |
| Norma URP | <<locked>> | 94% | 45,643 psi | 89% | 2844 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 84% | 45,078 psi | 88% | 2812 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 94% | 44,773 psi | 87% | 2835 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 70% | 1847 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 46,470 psi | 90% | 2782 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 45,469 psi | 88% | 2858 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 45,121 psi | 88% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 45,905 psi | 89% | 2874 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 45,614 psi | 89% | 2890 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 82% | 43,845 psi | 85% | 2713 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 45,194 psi | 88% | 2789 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,266 psi | 86% | 2740 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 46,543 psi | 90% | 2792 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 44,817 psi | 87% | 2749 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,685 psi | 85% | 2792 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 45,919 psi | 89% | 2785 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 45,107 psi | 88% | 2674 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 45,745 psi | 89% | 2789 fps | 99.4% |
| Somchem S365 | <<locked>> | 96% | 43,642 psi | 85% | 2851 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 84% | 46,456 psi | 90% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 44,295 psi | 86% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,990 psi | 85% | 2726 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 44,962 psi | 87% | 2795 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 45,426 psi | 88% | 2743 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,976 psi | 85% | 2792 fps | 97.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,177 psi | 82% | 2825 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,976 psi | 87% | 2772 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,418 psi | 67% | 2733 fps | 97.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 45,339 psi | 88% | 2789 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 2495 | <<locked>> | 80% | 40,248 psi | 78% | 2641 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,116 psi | 74% | 2631 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,159 psi | 72% | 2674 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 37,623 psi | 73% | 2602 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,292 psi | 78% | 2782 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,159 psi | 72% | 2621 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,885 psi | 77% | 2687 fps | 97.5% |
| Alliant Reloder-16 | 39.9 gr | 86% | 34,867 psi | 68% | 2628 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,068 psi | 62% | 2579 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,865 psi | 62% | 2572 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,492 psi | 73% | 2772 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 36,825 psi | 72% | 2625 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 80% | 37,724 psi | 73% | 2628 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,039 psi | 62% | 2523 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,712 psi | 79% | 2736 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 51% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,989 psi | 83% | 2723 fps | 99% |
| IMR 4064 | <<locked>> | 80% | 39,479 psi | 77% | 2638 fps | 97.5% |
| IMR 4831 | <<locked>> | 88% | 35,926 psi | 70% | 2625 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,886 psi | 79% | 2717 fps | 98.3% |
| Lovex D073.6 | <<locked>> | 80% | 43,381 psi | 84% | 2736 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 39,320 psi | 76% | 2641 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 41,379 psi | 80% | 2680 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 43,207 psi | 84% | 2707 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 39,276 psi | 76% | 2674 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 35,085 psi | 68% | 2618 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,957 psi | 76% | 2687 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,843 psi | 81% | 2776 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,498 psi | 51% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,772 psi | 85% | 2730 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,264 psi | 82% | 2795 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,185 psi | 66% | 2651 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,057 psi | 72% | 2690 fps | 95.5% |
| ReloadSwiss RS 70 | 45.7 gr | 90% | 39,769 psi | 77% | 2759 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 41,220 psi | 80% | 2661 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,389 psi | 67% | 2562 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,379 psi | 80% | 2680 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,381 psi | 84% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,320 psi | 76% | 2641 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,665 psi | 69% | 2615 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,960 psi | 83% | 2730 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,275 psi | 72% | 2530 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,360 psi | 69% | 2572 fps | 97.2% |
| Somchem S365 | 38.9 gr | 82% | 27,282 psi | 53% | 2441 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 40,756 psi | 79% | 2648 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,307 psi | 80% | 2651 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,605 psi | 65% | 2507 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 36,622 psi | 71% | 2621 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,929 psi | 78% | 2641 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,013 psi | 70% | 2618 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 34,374 psi | 67% | 2651 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,805 psi | 58% | 2421 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,269 psi | 59% | 2595 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,351 psi | 82% | 2730 fps | 98.9% |
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 54 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 115gr | Barnes TAC-TX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,808 fps to 2,907 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 67–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.264" calls for a 1:9.0 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. Alliant Reloder-16, Somchem S365, ReloadSwiss RS 70 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 115gr | Barnes TAC-TX BT 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.