Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 140gr | Sierra GameKing bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Winchester StaBALL HD.
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>> | 96% | 44,614 psi | 87% | 2562 fps | 98.4% |
| Accurate 4350 | <<locked>> | 86% | 43,613 psi | 85% | 2559 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 45,121 psi | 88% | 2598 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,034 psi | 87% | 2595 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 88% | 45,063 psi | 88% | 2621 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 84% | 45,092 psi | 88% | 2638 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,483 psi | 86% | 2589 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,570 psi | 87% | 2635 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 45,194 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,090 psi | 82% | 2615 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 44,034 psi | 86% | 2694 fps | 99.5% |
| Bofors RP5 | <<locked>> | 96% | 44,570 psi | 87% | 2635 fps | 96.2% |
| Bofors RP7 | <<locked>> | 84% | 45,136 psi | 88% | 2516 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 86% | 45,861 psi | 89% | 2608 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 84% | 46,151 psi | 90% | 2572 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 44,904 psi | 87% | 2556 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 45,136 psi | 88% | 2628 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,245 psi | 70% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 45,963 psi | 89% | 2556 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 44,135 psi | 86% | 2500 fps | 97.3% |
| IMR 4831 | <<locked>> | 88% | 44,512 psi | 86% | 2562 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 43,990 psi | 85% | 2500 fps | 98.5% |
| Lovex S070 | <<locked>> | 86% | 44,817 psi | 87% | 2536 fps | 97.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,467 psi | 82% | 2526 fps | 98% |
| Norma 204 | <<locked>> | 88% | 45,847 psi | 89% | 2592 fps | 96.1% |
| Norma MRP | <<locked>> | 94% | 43,859 psi | 85% | 2654 fps | 97.4% |
| Norma URP | <<locked>> | 88% | 46,064 psi | 89% | 2602 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 88% | 44,991 psi | 87% | 2598 fps | 98.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,396 psi | 86% | 2615 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 72% | 1690 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 44,759 psi | 87% | 2631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 46,514 psi | 90% | 2635 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 45,179 psi | 88% | 2651 fps | 99.3% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,886 psi | 79% | 2621 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 82% | 45,397 psi | 88% | 2539 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 46,412 psi | 90% | 2625 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 84% | 45,136 psi | 88% | 2516 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 43,990 psi | 85% | 2500 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 86% | 44,817 psi | 87% | 2536 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 46,528 psi | 90% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 46,050 psi | 89% | 2500 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,977 psi | 89% | 2618 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 45,803 psi | 89% | 2539 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 44,846 psi | 87% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 44,251 psi | 86% | 2556 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 84% | 46,470 psi | 90% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 44,860 psi | 87% | 2549 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 98% | 46,427 psi | 90% | 2585 fps | 97% |
| Vihtavuori N550 | <<locked>> | 86% | 44,164 psi | 86% | 2552 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 94% | 44,367 psi | 86% | 2612 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 44,338 psi | 86% | 2526 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 46,224 psi | 90% | 2615 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,308 psi | 84% | 2736 fps | 100% |
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>> | 88% | 34,142 psi | 66% | 2359 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 35,665 psi | 69% | 2402 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 90% | 42,192 psi | 82% | 2539 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,395 psi | 82% | 2543 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,056 psi | 68% | 2411 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,320 psi | 76% | 2526 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,945 psi | 81% | 2536 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,945 psi | 81% | 2582 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,527 psi | 50% | 2178 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,793 psi | 64% | 2395 fps | 95.4% |
| Alliant Reloder-26 | 43.2 gr | 84% | 31,053 psi | 60% | 2392 fps | 95.6% |
| Bofors RP5 | <<locked>> | 94% | 41,945 psi | 81% | 2582 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 40,045 psi | 78% | 2421 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 37,710 psi | 73% | 2444 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 40,654 psi | 79% | 2464 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,430 psi | 63% | 2313 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 82% | 39,218 psi | 76% | 2510 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 53% | 1473 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 37,985 psi | 74% | 2398 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,321 psi | 80% | 2448 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 34,301 psi | 67% | 2359 fps | 97.5% |
| Lovex S065 | <<locked>> | 80% | 38,783 psi | 75% | 2398 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 37,246 psi | 72% | 2385 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 32,924 psi | 64% | 2329 fps | 95.1% |
| Norma 204 | <<locked>> | 86% | 42,830 psi | 83% | 2536 fps | 95.2% |
| Norma MRP | 44.9 gr | 90% | 38,290 psi | 74% | 2536 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 35,694 psi | 69% | 2402 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 80% | 34,403 psi | 67% | 2382 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 41,350 psi | 80% | 2552 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,485 psi | 53% | 1509 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,771 psi | 81% | 2579 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,273 psi | 69% | 2418 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,563 psi | 67% | 2421 fps | 96.6% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,971 psi | 74% | 2552 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 42,685 psi | 83% | 2490 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 90% | 40,640 psi | 79% | 2516 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 40,045 psi | 78% | 2421 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,783 psi | 75% | 2398 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 80% | 37,246 psi | 72% | 2385 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,482 psi | 84% | 2539 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,189 psi | 74% | 2349 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,192 psi | 84% | 2569 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 42,859 psi | 83% | 2487 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 32,126 psi | 62% | 2359 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 38,957 psi | 76% | 2454 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 41,089 psi | 80% | 2425 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,028 psi | 72% | 2398 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 40,785 psi | 79% | 2480 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 36,405 psi | 71% | 2398 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 27,847 psi | 54% | 2251 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,187 psi | 70% | 2372 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 37,710 psi | 73% | 2444 fps | 95.7% |
| Winchester StaBALL HD | 41.5 gr | 84% | 25,614 psi | 50% | 2257 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 53 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 140gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,736 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 53 of the 53 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 140.0 gr projectile in 0.264" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Hodgdon TrailBoss, Lovex S071 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, Norma MRP, Winchester StaBALL HD rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 140gr | Sierra GameKing 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.