Load Specifications
Load data in caliber 6.5 x 57 with .263 | 139gr | Prvi Partizan FMJ BT bullet and 68 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 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 3100 | <<locked>> | 98% | 50,894 psi | 90% | 2694 fps | 99.5% |
| Accurate 4350 | <<locked>> | 88% | 49,821 psi | 88% | 2694 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 48,631 psi | 86% | 2769 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 82% | 49,559 psi | 88% | 2621 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 50,865 psi | 90% | 2733 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 50,763 psi | 90% | 2726 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 50,386 psi | 89% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 50,676 psi | 90% | 2746 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 47,863 psi | 85% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 50,140 psi | 89% | 2720 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 50,850 psi | 90% | 2776 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 98% | 48,225 psi | 85% | 2717 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,686 psi | 79% | 2697 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,126 psi | 90% | 2841 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,734 psi | 88% | 2756 fps | 97.6% |
| Bofors RP3 | <<locked>> | 82% | 50,836 psi | 90% | 2657 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 50,850 psi | 90% | 2776 fps | 98% |
| Bofors RP7 | <<locked>> | 86% | 50,560 psi | 89% | 2644 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 82% | 50,995 psi | 90% | 2667 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 86% | 48,530 psi | 86% | 2684 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 84% | 48,501 psi | 86% | 2644 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 50,966 psi | 90% | 2677 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,598 psi | 77% | 2723 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 86% | 47,906 psi | 85% | 2710 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 65% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 51,169 psi | 90% | 2674 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 48,791 psi | 86% | 2618 fps | 98.5% |
| IMR 4831 | <<locked>> | 90% | 50,372 psi | 89% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,575 psi | 89% | 2664 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 98% | 49,501 psi | 88% | 2749 fps | 96.2% |
| Lovex S065 | <<locked>> | 86% | 48,994 psi | 87% | 2618 fps | 99.4% |
| Lovex S070 | <<locked>> | 88% | 50,125 psi | 89% | 2657 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,484 psi | 80% | 2608 fps | 98.8% |
| Norma 204 | <<locked>> | 88% | 48,225 psi | 85% | 2664 fps | 97% |
| Norma MRP | <<locked>> | 96% | 50,082 psi | 89% | 2795 fps | 98.9% |
| Norma URP | <<locked>> | 88% | 48,834 psi | 86% | 2677 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 49,545 psi | 88% | 2762 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 90% | 50,879 psi | 90% | 2730 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,485 psi | 84% | 2703 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,202 psi | 66% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 51,068 psi | 90% | 2657 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 50,894 psi | 90% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 49,472 psi | 87% | 2710 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 48,022 psi | 85% | 2730 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,511 psi | 77% | 2717 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 84% | 51,068 psi | 90% | 2657 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,037 psi | 87% | 2648 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 94% | 49,516 psi | 88% | 2707 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 86% | 50,560 psi | 89% | 2644 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 48,994 psi | 87% | 2618 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 88% | 50,125 psi | 89% | 2657 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 49,066 psi | 87% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 49,037 psi | 87% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 48,515 psi | 86% | 2572 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,081 psi | 87% | 2703 fps | 97.6% |
| Somchem S355 | <<locked>> | 84% | 51,010 psi | 90% | 2651 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 47,805 psi | 85% | 2680 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 49,908 psi | 88% | 2684 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 84% | 48,994 psi | 87% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 50,734 psi | 90% | 2674 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 49,110 psi | 87% | 2657 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 88% | 49,719 psi | 88% | 2674 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 96% | 50,604 psi | 89% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 50,502 psi | 89% | 2782 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 50,067 psi | 89% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 48,820 psi | 86% | 2690 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,383 psi | 82% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 49,632 psi | 88% | 2674 fps | 97.4% |
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>> | 84% | 31,937 psi | 56% | 2326 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 37,797 psi | 67% | 2474 fps | 98.6% |
| Accurate High Country | <<locked>> | 92% | 45,179 psi | 80% | 2707 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 46,543 psi | 82% | 2569 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,669 psi | 74% | 2562 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,930 psi | 74% | 2566 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,326 psi | 84% | 2598 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,912 psi | 65% | 2484 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,713 psi | 74% | 2598 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,495 psi | 73% | 2559 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,611 psi | 74% | 2605 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,977 psi | 48% | 2247 fps | 96.5% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,474 psi | 57% | 2415 fps | 95.7% |
| Alliant Reloder-26 | 44.7 gr | 82% | 30,922 psi | 55% | 2415 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 41,046 psi | 73% | 2592 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 47,688 psi | 84% | 2608 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,611 psi | 74% | 2605 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,901 psi | 74% | 2487 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,877 psi | 85% | 2618 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 39,784 psi | 70% | 2516 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 42,786 psi | 76% | 2539 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,403 psi | 61% | 2382 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,944 psi | 72% | 2661 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 38,537 psi | 68% | 2523 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 48% | 1509 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 37,478 psi | 66% | 2415 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,091 psi | 76% | 2513 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 36,448 psi | 64% | 2428 fps | 98.3% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,514 psi | 84% | 2612 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 46,108 psi | 82% | 2687 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 40,683 psi | 72% | 2467 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 39,073 psi | 69% | 2451 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 33,025 psi | 58% | 2356 fps | 95.5% |
| Norma 204 | <<locked>> | 84% | 42,134 psi | 74% | 2549 fps | 95.4% |
| Norma MRP | 45.5 gr | 86% | 35,752 psi | 63% | 2503 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 37,637 psi | 67% | 2467 fps | 98.4% |
| Ramshot Grand | <<locked>> | 96% | 46,021 psi | 81% | 2697 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 36,332 psi | 64% | 2451 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 38,305 psi | 68% | 2523 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 49% | 1542 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,008 psi | 85% | 2605 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,295 psi | 78% | 2651 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,623 psi | 67% | 2493 fps | 98.3% |
| ReloadSwiss RS 70 | 43.2 gr | 80% | 36,506 psi | 65% | 2497 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,811 psi | 67% | 2585 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 44,860 psi | 79% | 2559 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,050 psi | 81% | 2595 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 40,379 psi | 71% | 2539 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,901 psi | 74% | 2487 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,683 psi | 72% | 2467 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 80% | 39,073 psi | 69% | 2451 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,759 psi | 81% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,977 psi | 81% | 2464 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,842 psi | 70% | 2415 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,001 psi | 71% | 2533 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 44,962 psi | 79% | 2552 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,084 psi | 60% | 2428 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,464 psi | 68% | 2470 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 43,091 psi | 76% | 2490 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,957 psi | 69% | 2467 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 92% | 40,422 psi | 71% | 2503 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 38,450 psi | 68% | 2467 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 29,762 psi | 53% | 2323 fps | 96.7% |
| Vihtavuori N560 | <<locked>> | 94% | 47,355 psi | 84% | 2726 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,029 psi | 67% | 2438 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,784 psi | 70% | 2516 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,483 psi | 45% | 2280 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,393 psi | 71% | 2507 fps | 95% |
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 68 powders for 6.5 x 57 loaded with the .263 | 139gr | Prvi Partizan FMJ BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,841 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,841 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 68 of the 68 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (390 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.263" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Bofors RP15, Hodgdon Retumbo 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, ReloadSwiss RS 70 rank at the top here: for 6.5 x 57 with the .263 | 139gr | Prvi Partizan FMJ 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.