Load Specifications
Load data in caliber 6.5 x 64 (Reb) with .263 | 139gr | Prvi Partizan SP BT bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP and Vihtavuori N560.
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% | 54,288 psi | 87% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,999 psi | 90% | 2838 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,724 psi | 89% | 2946 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 92% | 52,852 psi | 85% | 2887 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 90% | 53,069 psi | 85% | 2835 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 54,375 psi | 87% | 2894 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,631 psi | 78% | 2789 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,395 psi | 70% | 2749 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 53,359 psi | 86% | 2835 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 86% | 53,069 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,114 psi | 87% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,231 psi | 90% | 2881 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,360 psi | 87% | 2890 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,419 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,592 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,840 psi | 90% | 2953 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,202 psi | 90% | 2854 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 53,258 psi | 85% | 2871 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,575 psi | 81% | 2858 fps | 98.3% |
| Bofors RP5 | <<locked>> | 94% | 54,360 psi | 87% | 2890 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 54,621 psi | 88% | 2782 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,519 psi | 86% | 2877 fps | 99% |
| Hodgdon H414 | <<locked>> | 84% | 53,940 psi | 86% | 2835 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 82% | 53,055 psi | 85% | 2792 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 54,201 psi | 87% | 2831 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,330 psi | 86% | 2815 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 53,330 psi | 86% | 2762 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,650 psi | 86% | 2989 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 53,969 psi | 87% | 2867 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 60% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,318 psi | 90% | 2822 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,231 psi | 90% | 2805 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 56,101 psi | 90% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,506 psi | 89% | 2818 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 55,840 psi | 90% | 2930 fps | 98.7% |
| Lovex S065 | <<locked>> | 84% | 53,490 psi | 86% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,926 psi | 88% | 2799 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,506 psi | 89% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 86% | 53,447 psi | 86% | 2818 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 38,841 psi | 62% | 2671 fps | 97.4% |
| Norma MRP | <<locked>> | 92% | 53,853 psi | 86% | 2907 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 54,288 psi | 87% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,434 psi | 90% | 2949 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 52,982 psi | 85% | 2818 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,810 psi | 88% | 2884 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 61% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,738 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 53,969 psi | 87% | 2884 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2986 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,979 psi | 79% | 2867 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 55,956 psi | 90% | 2782 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,259 psi | 87% | 2805 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 55,463 psi | 89% | 2867 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 54,621 psi | 88% | 2782 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 53,490 psi | 86% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,926 psi | 88% | 2799 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,869 psi | 90% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,115 psi | 90% | 2759 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,027 psi | 88% | 2861 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 55,680 psi | 89% | 2776 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,796 psi | 89% | 2799 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 54,694 psi | 88% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,246 psi | 90% | 2844 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 53,301 psi | 85% | 2700 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,188 psi | 90% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,448 psi | 89% | 2818 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,317 psi | 89% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,230 psi | 87% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 53,751 psi | 86% | 2900 fps | 98% |
| Vihtavuori N565 | <<locked>> | 98% | 53,534 psi | 86% | 2881 fps | 98.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2877 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,564 psi | 89% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 53,940 psi | 86% | 2835 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 52,692 psi | 84% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,912 psi | 90% | 2835 fps | 99.3% |
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>> | 80% | 34,055 psi | 55% | 2421 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 45,658 psi | 73% | 2674 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 42,395 psi | 68% | 2700 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 88% | 46,006 psi | 74% | 2762 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 37,971 psi | 61% | 2543 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 41,408 psi | 66% | 2648 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 42,525 psi | 68% | 2667 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 92% | 33,576 psi | 54% | 2510 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,435 psi | 62% | 2546 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,569 psi | 70% | 2674 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,314 psi | 81% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,087 psi | 61% | 2539 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,230 psi | 58% | 2536 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,561 psi | 52% | 2448 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,442 psi | 46% | 2349 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,621 psi | 57% | 2582 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,750 psi | 85% | 2795 fps | 95.2% |
| Bofors RP15 | <<locked>> | 86% | 38,493 psi | 62% | 2589 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 38,696 psi | 62% | 2625 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 36,230 psi | 58% | 2536 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 48,312 psi | 77% | 2674 fps | 99% |
| Hodgdon H1000 | <<locked>> | 92% | 40,828 psi | 65% | 2635 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 47,152 psi | 76% | 2720 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,777 psi | 80% | 2733 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 44,382 psi | 71% | 2657 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,439 psi | 70% | 2638 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,176 psi | 66% | 2566 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 35,911 psi | 58% | 2605 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 46,702 psi | 75% | 2743 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 44% | 1578 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,729 psi | 70% | 2605 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,632 psi | 80% | 2700 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 43,482 psi | 70% | 2618 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,163 psi | 69% | 2598 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 42,612 psi | 68% | 2687 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 47,152 psi | 76% | 2648 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,658 psi | 73% | 2644 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 29,356 psi | 47% | 2300 fps | 95% |
| Norma 204 | <<locked>> | 80% | 43,627 psi | 70% | 2641 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 34,142 psi | 55% | 2552 fps | 95.4% |
| Norma MRP | 50 gr | 80% | 35,447 psi | 57% | 2546 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 44,817 psi | 72% | 2661 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 39,624 psi | 64% | 2631 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,453 psi | 70% | 2651 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 35,201 psi | 56% | 2510 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 45% | 1617 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,527 psi | 73% | 2694 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,671 psi | 70% | 2707 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,866 psi | 53% | 2520 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,455 psi | 73% | 2795 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 52,692 psi | 84% | 2736 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,061 psi | 67% | 2582 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 37,304 psi | 60% | 2523 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 48,312 psi | 77% | 2674 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,152 psi | 76% | 2648 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,658 psi | 73% | 2644 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,649 psi | 84% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,253 psi | 74% | 2598 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,999 psi | 59% | 2520 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 52,243 psi | 84% | 2726 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,873 psi | 69% | 2572 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 41,655 psi | 67% | 2615 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,942 psi | 61% | 2513 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 50,241 psi | 81% | 2657 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,180 psi | 74% | 2654 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,143 psi | 56% | 2441 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,469 psi | 73% | 2654 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,535 psi | 59% | 2523 fps | 99.4% |
| Vihtavuori N560 | 53.7 gr | 86% | 43,801 psi | 70% | 2717 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 43,685 psi | 70% | 2703 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 98% | 46,804 psi | 75% | 2808 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,092 psi | 72% | 2615 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,384 psi | 76% | 2723 fps | 99.2% |
| Winchester StaBALL HD | 49.4 gr | 80% | 28,906 psi | 46% | 2457 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,086 psi | 59% | 2493 fps | 95.3% |
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 75 powders for 6.5 x 64 (Reb) loaded with the .263 | 139gr | Prvi Partizan SP BT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,989 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.263" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Norma MRP, Vihtavuori N560 rank at the top here: for 6.5 x 64 (Reb) with the .263 | 139gr | Prvi Partizan SP 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.