Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .263 | 156gr | Prvi Partizan SP RN bullet and 59 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Alliant Reloder-26 and Ramshot Grand.
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>> | 94% | 46,543 psi | 90% | 2467 fps | 99.5% |
| Accurate 4350 | <<locked>> | 84% | 45,165 psi | 88% | 2451 fps | 99.9% |
| Accurate High Country | <<locked>> | 90% | 43,976 psi | 85% | 2526 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 90% | 46,021 psi | 89% | 2490 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,883 psi | 72% | 2392 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 46,108 psi | 90% | 2487 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 46,325 psi | 90% | 2507 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 46,354 psi | 90% | 2516 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,571 psi | 89% | 2480 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 46,035 psi | 89% | 2533 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 43,990 psi | 85% | 2484 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,398 psi | 90% | 2569 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 46,006 psi | 89% | 2592 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 45,382 psi | 88% | 2523 fps | 97.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,105 psi | 82% | 2493 fps | 96% |
| Bofors RP5 | <<locked>> | 94% | 46,035 psi | 89% | 2533 fps | 97.8% |
| Bofors RP7 | <<locked>> | 82% | 45,890 psi | 89% | 2408 fps | 98.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,948 psi | 89% | 2513 fps | 97% |
| Hodgdon H414 | <<locked>> | 82% | 43,903 psi | 85% | 2441 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 46,354 psi | 90% | 2441 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,382 psi | 88% | 2608 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 84% | 46,108 psi | 90% | 2520 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 71% | 1572 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 44,019 psi | 85% | 2395 fps | 98.1% |
| IMR 4831 | <<locked>> | 86% | 45,977 psi | 89% | 2451 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,905 psi | 89% | 2431 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,643 psi | 87% | 2507 fps | 96% |
| Lovex S065 | <<locked>> | 82% | 44,802 psi | 87% | 2388 fps | 99.4% |
| Lovex S070 | <<locked>> | 84% | 45,542 psi | 88% | 2421 fps | 98.9% |
| Lovex S071 | <<locked>> | 98% | 44,324 psi | 86% | 2431 fps | 99.2% |
| Norma 204 | <<locked>> | 84% | 43,758 psi | 85% | 2428 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 45,455 psi | 88% | 2552 fps | 98.9% |
| Norma URP | <<locked>> | 84% | 44,324 psi | 86% | 2441 fps | 99.9% |
| Ramshot Grand | <<locked>> | 94% | 44,541 psi | 87% | 2516 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 86% | 46,195 psi | 90% | 2490 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 98% | 45,876 psi | 89% | 2523 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,434 psi | 73% | 1608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 44,846 psi | 87% | 2470 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 46,354 psi | 90% | 2539 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,063 psi | 88% | 2602 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 44,802 psi | 87% | 2418 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 90% | 44,831 psi | 87% | 2467 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 82% | 45,890 psi | 89% | 2408 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 44,802 psi | 87% | 2388 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 84% | 45,542 psi | 88% | 2421 fps | 98.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 43,787 psi | 85% | 2339 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,425 psi | 86% | 2464 fps | 97.4% |
| Somchem S365 | <<locked>> | 86% | 43,613 psi | 85% | 2448 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 45,484 psi | 88% | 2451 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 84% | 46,122 psi | 90% | 2438 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 94% | 44,933 psi | 87% | 2434 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 84% | 45,469 psi | 88% | 2444 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 92% | 46,079 psi | 89% | 2503 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 45,861 psi | 89% | 2543 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 44,802 psi | 87% | 2520 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 44,991 psi | 87% | 2405 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 44,193 psi | 86% | 2448 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 45,165 psi | 88% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,918 psi | 87% | 2441 fps | 97.3% |
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>> | 82% | 30,980 psi | 60% | 2165 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 39,465 psi | 77% | 2352 fps | 99.5% |
| Accurate High Country | <<locked>> | 88% | 41,031 psi | 80% | 2470 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 84% | 38,043 psi | 74% | 2336 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 34,548 psi | 67% | 2336 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,145 psi | 74% | 2336 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,203 psi | 74% | 2359 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,236 psi | 84% | 2467 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,811 psi | 73% | 2333 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,782 psi | 73% | 2375 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,007 psi | 54% | 2146 fps | 98.1% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,791 psi | 58% | 2208 fps | 95.7% |
| Alliant Reloder-26 | 41 gr | 80% | 29,907 psi | 58% | 2251 fps | 96.7% |
| Bofors RP15 | <<locked>> | 90% | 37,565 psi | 73% | 2369 fps | 95.2% |
| Bofors RP30 | <<locked>> | 98% | 39,581 psi | 77% | 2448 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 37,782 psi | 73% | 2375 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 43,207 psi | 84% | 2359 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 40,263 psi | 78% | 2405 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 41,321 psi | 80% | 2395 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,708 psi | 69% | 2260 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,449 psi | 73% | 2434 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 39,972 psi | 78% | 2405 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 53% | 1401 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 38,827 psi | 75% | 2300 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 37,710 psi | 73% | 2306 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,250 psi | 84% | 2385 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 42,003 psi | 82% | 2454 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 41,989 psi | 82% | 2339 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 40,437 psi | 79% | 2329 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 30,342 psi | 59% | 2152 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 38,116 psi | 74% | 2320 fps | 95.2% |
| Norma MRP | <<locked>> | 84% | 34,563 psi | 67% | 2333 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,160 psi | 76% | 2346 fps | 99.3% |
| Ramshot Grand | 45.4 gr | 92% | 41,539 psi | 81% | 2461 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,753 psi | 73% | 2336 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 92% | 36,825 psi | 72% | 2349 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,949 psi | 54% | 1434 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,088 psi | 76% | 2369 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,840 psi | 73% | 2379 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,185 psi | 66% | 2356 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 86% | 42,148 psi | 82% | 2372 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 36,912 psi | 72% | 2316 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 43,207 psi | 84% | 2359 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,989 psi | 82% | 2339 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 40,437 psi | 79% | 2329 fps | 97.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,278 psi | 80% | 2293 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,564 psi | 71% | 2313 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,636 psi | 69% | 2310 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,230 psi | 68% | 2254 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 80% | 40,509 psi | 79% | 2343 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 36,869 psi | 72% | 2287 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 39,827 psi | 77% | 2343 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,125 psi | 60% | 2215 fps | 98.1% |
| Vihtavuori N560 | <<locked>> | 90% | 42,873 psi | 83% | 2487 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 41,843 psi | 81% | 2464 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,436 psi | 77% | 2313 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,321 psi | 80% | 2395 fps | 98% |
| Winchester StaBALL HD | 39.4 gr | 80% | 24,772 psi | 48% | 2133 fps | 97.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,073 psi | 76% | 2336 fps | 95.7% |
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 59 powders for 6.5 x 58 mm Mauser Port. loaded with the .263 | 156gr | Prvi Partizan SP RN. Winchester StaBALL HD delivers the highest muzzle velocity at 2,635 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,635 fps. ADI AR 2225 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 156.0 gr projectile in 0.263" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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. Winchester StaBALL HD, Alliant Reloder-26, Ramshot Grand rank at the top here: for 6.5 x 58 mm Mauser Port. with the .263 | 156gr | Prvi Partizan SP RN 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.