Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 144gr | Sierra MatchKing bullet and 46 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% | 58,218 psi | 90% | 2904 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 2956 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 82% | 57,377 psi | 88% | 3018 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 57,856 psi | 89% | 3012 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,638 psi | 89% | 3002 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 58,566 psi | 90% | 3140 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 57,696 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 58,421 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 58,392 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,753 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,841 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,391 psi | 87% | 3041 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,811 psi | 87% | 3038 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,638 psi | 89% | 2972 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 57,827 psi | 89% | 2995 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,740 psi | 89% | 3015 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 58,392 psi | 90% | 3005 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,984 psi | 85% | 2956 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,347 psi | 87% | 2943 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,245 psi | 85% | 2923 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,827 psi | 89% | 3084 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 59% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,260 psi | 87% | 2917 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 56,695 psi | 87% | 2999 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,697 psi | 90% | 2933 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,579 psi | 87% | 3012 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,637 psi | 87% | 2884 fps | 100% |
| Norma 217 | <<locked>> | 96% | 58,160 psi | 90% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,218 psi | 90% | 3025 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,550 psi | 87% | 2949 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 60% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 58,624 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,609 psi | 89% | 3041 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 58,494 psi | 90% | 2972 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 2963 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,131 psi | 89% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,479 psi | 90% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,682 psi | 90% | 2930 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 58,334 psi | 90% | 2972 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 58,392 psi | 90% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 58,044 psi | 89% | 3028 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,738 psi | 86% | 2966 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 57,914 psi | 89% | 3045 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 55,579 psi | 86% | 3048 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 58,349 psi | 90% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 58,508 psi | 90% | 2940 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% | 50,923 psi | 78% | 2795 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,613 psi | 67% | 2753 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 53,461 psi | 82% | 2953 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 50,372 psi | 78% | 2887 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 37,927 psi | 58% | 2631 fps | 97.7% |
| ADI AR 2218 | 78.6 gr | 88% | 43,366 psi | 67% | 2838 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 35,288 psi | 54% | 2605 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,737 psi | 84% | 2920 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,111 psi | 79% | 2884 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,806 psi | 77% | 2799 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,005 psi | 68% | 2759 fps | 100% |
| Alliant Reloder-33 | 76.4 gr | 84% | 41,887 psi | 64% | 2756 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 90% | 45,426 psi | 70% | 2825 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,471 psi | 73% | 2789 fps | 97.3% |
| Bofors RP15 | <<locked>> | 80% | 47,732 psi | 73% | 2822 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 41,176 psi | 63% | 2707 fps | 98.5% |
| Bofors RP5 | <<locked>> | 80% | 51,111 psi | 79% | 2884 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,394 psi | 64% | 2710 fps | 99% |
| Hodgdon H4831 | <<locked>> | 80% | 52,678 psi | 81% | 2881 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,648 psi | 79% | 2864 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,424 psi | 67% | 2831 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 44% | 1709 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,736 psi | 81% | 2858 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 49,313 psi | 76% | 2874 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,474 psi | 79% | 2812 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,779 psi | 50% | 2513 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 43,918 psi | 68% | 2671 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,475 psi | 52% | 2549 fps | 97.8% |
| Ramshot Grand | <<locked>> | 80% | 50,227 psi | 77% | 2894 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 45,353 psi | 70% | 2762 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,457 psi | 45% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,105 psi | 66% | 2805 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,639 psi | 61% | 2697 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 54,694 psi | 84% | 2913 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,701 psi | 70% | 2772 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,346 psi | 84% | 2913 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,824 psi | 84% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,327 psi | 74% | 2766 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,616 psi | 73% | 2779 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 54,868 psi | 84% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 54,056 psi | 83% | 2959 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 45,469 psi | 70% | 2779 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 80% | 40,611 psi | 63% | 2710 fps | 96.4% |
| Vihtavuori N570 | 73.5 gr | 84% | 44,759 psi | 69% | 2835 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,517 psi | 78% | 2884 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,894 psi | 78% | 2822 fps | 100% |
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 46 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 144gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,140 fps. Accurate 8700 gives the best case fill at 100 %, and 46 of the 46 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 144.0 gr projectile in 0.264" calls for a 1:9.0 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 | 144gr | Sierra MatchKing 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.