Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 139gr | Norma FMJ Elektron bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-33.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 57,348 psi | 88% | 2940 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,330 psi | 82% | 2976 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 82% | 56,391 psi | 87% | 3045 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 58,015 psi | 89% | 3022 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,942 psi | 88% | 3041 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 56,710 psi | 87% | 3031 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,319 psi | 88% | 3159 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 56,652 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,653 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,479 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,912 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,782 psi | 87% | 3018 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,274 psi | 85% | 3061 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,796 psi | 86% | 3061 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,956 psi | 88% | 3002 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 57,145 psi | 88% | 3028 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,666 psi | 87% | 3041 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,479 psi | 88% | 3035 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 58,117 psi | 89% | 3048 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,535 psi | 85% | 2969 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,204 psi | 90% | 3012 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,594 psi | 87% | 3110 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1942 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,550 psi | 85% | 2946 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 84% | 55,753 psi | 86% | 3025 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,812 psi | 89% | 2959 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,579 psi | 86% | 3038 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,811 psi | 86% | 2917 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,101 psi | 88% | 3058 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,870 psi | 89% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,159 psi | 88% | 3051 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,666 psi | 86% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 60% | 1988 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,450 psi | 88% | 3094 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,536 psi | 87% | 3068 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 58,160 psi | 90% | 2992 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,450 psi | 88% | 3005 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,143 psi | 85% | 2986 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,087 psi | 88% | 2999 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,696 psi | 89% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,783 psi | 89% | 2959 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,479 psi | 88% | 2995 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 57,566 psi | 89% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,087 psi | 88% | 3054 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,682 psi | 90% | 3054 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,913 psi | 88% | 3071 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 58,436 psi | 90% | 3140 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,392 psi | 88% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,609 psi | 89% | 2972 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 50,198 psi | 77% | 2828 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 46,035 psi | 71% | 2841 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 52,576 psi | 81% | 2976 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 54,273 psi | 84% | 2963 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,617 psi | 76% | 2913 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 37,144 psi | 57% | 2648 fps | 97% |
| ADI AR 2218 | 81.2 gr | 90% | 45,847 psi | 71% | 2930 fps | 96.3% |
| ADI AR 2225 | <<locked>> | 80% | 34,505 psi | 53% | 2618 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,027 psi | 83% | 2949 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,357 psi | 78% | 2913 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,110 psi | 76% | 2831 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,279 psi | 67% | 2785 fps | 100% |
| Alliant Reloder-33 | 79 gr | 86% | 44,237 psi | 68% | 2844 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,672 psi | 69% | 2844 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,934 psi | 72% | 2818 fps | 96.9% |
| Bofors RP15 | <<locked>> | 80% | 46,847 psi | 72% | 2844 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 40,480 psi | 62% | 2730 fps | 98% |
| Bofors RP5 | <<locked>> | 80% | 50,357 psi | 78% | 2913 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,495 psi | 62% | 2726 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,750 psi | 80% | 2907 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,952 psi | 78% | 2890 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,395 psi | 65% | 2851 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 44% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,112 psi | 80% | 2887 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 48,544 psi | 75% | 2897 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,201 psi | 83% | 2897 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,548 psi | 53% | 2598 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 43,366 psi | 67% | 2700 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,634 psi | 50% | 2559 fps | 97.1% |
| Norma MRP | <<locked>> | 80% | 53,882 psi | 83% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,327 psi | 76% | 2917 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,512 psi | 69% | 2782 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,515 psi | 45% | 1781 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,148 psi | 65% | 2825 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,798 psi | 60% | 2713 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 54,476 psi | 84% | 2933 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,983 psi | 83% | 2946 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,993 psi | 74% | 2854 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,635 psi | 83% | 2943 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,070 psi | 83% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,659 psi | 73% | 2792 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 50,154 psi | 77% | 2867 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 53,925 psi | 83% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,214 psi | 82% | 2989 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,730 psi | 69% | 2802 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 39,827 psi | 61% | 2730 fps | 95.7% |
| Vihtavuori N570 | 76 gr | 86% | 47,181 psi | 73% | 2927 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,458 psi | 76% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,169 psi | 77% | 2851 fps | 99.9% |
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 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 139gr | Norma FMJ Elektron. ADI AR 2218 delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,159 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.264" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 139gr | Norma FMJ Elektron 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.