Load Specifications
Load data in caliber 6.5 x 63 Messner Mag. with .263 | 139gr | Prvi Partizan FMJ BT bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 80 and Vihtavuori N570.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 54,244 psi | 85% | 2907 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,811 psi | 87% | 3068 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 56,695 psi | 89% | 3071 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 55,463 psi | 87% | 2995 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 57,595 psi | 90% | 3071 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 55,825 psi | 87% | 3038 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 3081 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,317 psi | 85% | 3064 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,622 psi | 87% | 2992 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,622 psi | 87% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,840 psi | 88% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,013 psi | 86% | 2982 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,041 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,898 psi | 88% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,927 psi | 88% | 3041 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,376 psi | 88% | 3058 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3140 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,578 psi | 86% | 2969 fps | 97.9% |
| Bofors RP15 | <<locked>> | 92% | 57,101 psi | 89% | 3051 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,738 psi | 87% | 3058 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 54,041 psi | 85% | 3002 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,450 psi | 90% | 3064 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,942 psi | 89% | 3002 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,593 psi | 87% | 2982 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,985 psi | 88% | 2900 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,839 psi | 86% | 3127 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 1890 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,476 psi | 85% | 2913 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,940 psi | 86% | 2917 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,217 psi | 90% | 2976 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 55,898 psi | 88% | 3051 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,574 psi | 78% | 2976 fps | 99.4% |
| Lovex S070 | <<locked>> | 82% | 56,681 psi | 89% | 2946 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,782 psi | 87% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,463 psi | 87% | 2972 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,502 psi | 79% | 3002 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,143 psi | 85% | 3022 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,594 psi | 89% | 2959 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,913 psi | 89% | 3074 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,448 psi | 87% | 2969 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,216 psi | 87% | 2999 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 1932 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,159 psi | 90% | 3035 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,419 psi | 87% | 3117 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,694 psi | 86% | 3077 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 86% | 56,275 psi | 88% | 2966 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 54,911 psi | 86% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,681 psi | 89% | 2946 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,058 psi | 89% | 2894 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,505 psi | 85% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,537 psi | 90% | 2956 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 54,186 psi | 85% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,172 psi | 86% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,071 psi | 86% | 2930 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,667 psi | 90% | 3005 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 82% | 57,363 psi | 90% | 2956 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,172 psi | 85% | 2940 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,537 psi | 90% | 3084 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 54,404 psi | 85% | 3012 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 55,550 psi | 87% | 3081 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 56,608 psi | 89% | 3143 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,392 psi | 90% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,448 psi | 87% | 3061 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,969 psi | 86% | 2943 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,466 psi | 65% | 2687 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 45,194 psi | 71% | 2871 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 80% | 42,859 psi | 67% | 2815 fps | 96.7% |
| ADI AR 2209 | <<locked>> | 80% | 45,498 psi | 71% | 2818 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 40,741 psi | 64% | 2756 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 34,780 psi | 55% | 2612 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 45,121 psi | 71% | 2930 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 27,804 psi | 44% | 2451 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,847 psi | 72% | 2818 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,847 psi | 72% | 2818 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,257 psi | 82% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,440 psi | 71% | 2812 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,423 psi | 65% | 2762 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,103 psi | 63% | 2703 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,737 psi | 54% | 2641 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,049 psi | 71% | 2871 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,919 psi | 72% | 2927 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,194 psi | 71% | 2789 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 38,624 psi | 61% | 2697 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 34,519 psi | 54% | 2628 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 41,423 psi | 65% | 2762 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 32,909 psi | 52% | 2562 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 43,381 psi | 68% | 2756 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,569 psi | 67% | 2740 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,095 psi | 77% | 2802 fps | 100% |
| Hodgdon Retumbo | 57.2 gr | 80% | 33,895 psi | 53% | 2674 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,297 psi | 44% | 1690 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,155 psi | 80% | 2861 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,517 psi | 81% | 2864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,570 psi | 70% | 2749 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,392 psi | 62% | 2736 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,389 psi | 55% | 2671 fps | 95.8% |
| Lovex S070 | <<locked>> | 80% | 53,272 psi | 83% | 2890 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,752 psi | 56% | 2562 fps | 99% |
| Norma 204 | <<locked>> | 80% | 51,808 psi | 81% | 2913 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 29,008 psi | 45% | 2510 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 43,729 psi | 69% | 2831 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 53,084 psi | 83% | 2907 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,436 psi | 62% | 2749 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,808 psi | 81% | 2913 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,230 psi | 55% | 2621 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 1726 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,229 psi | 83% | 2976 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,982 psi | 52% | 2644 fps | 97.9% |
| ReloadSwiss RS 80 | 66.3 gr | 86% | 37,434 psi | 59% | 2730 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 46,412 psi | 73% | 2792 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 44,860 psi | 70% | 2799 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 53,272 psi | 83% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,534 psi | 84% | 2841 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,512 psi | 70% | 2792 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 47,268 psi | 74% | 2782 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 50,720 psi | 79% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,397 psi | 71% | 2776 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 39,639 psi | 62% | 2651 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 92% | 50,517 psi | 79% | 2887 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 53,650 psi | 84% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,744 psi | 70% | 2785 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,497 psi | 68% | 2825 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 80% | 36,100 psi | 57% | 2641 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 88% | 41,684 psi | 65% | 2818 fps | 96% |
| Vihtavuori N570 | 68.3 gr | 92% | 45,730 psi | 72% | 2940 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,679 psi | 84% | 2844 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,724 psi | 59% | 2759 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,785 psi | 65% | 2707 fps | 98.5% |
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 64 powders for 6.5 x 63 Messner Mag. loaded with the .263 | 139gr | Prvi Partizan FMJ BT. Vihtavuori N570 delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,890 fps to 3,143 fps. ADI AR 2218 gives the best case fill at 100 %, and 64 of the 64 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, 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. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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. Hodgdon Retumbo, ReloadSwiss RS 80, Vihtavuori N570 rank at the top here: for 6.5 x 63 Messner Mag. 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.