Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 150gr | Sierra MatchKing bullet and 41 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-50.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 55,274 psi | 85% | 2812 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,245 psi | 85% | 2923 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 82% | 58,218 psi | 90% | 2979 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 82% | 54,882 psi | 84% | 2913 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 58,639 psi | 90% | 2963 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,114 psi | 85% | 3031 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 94% | 58,639 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,535 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,667 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 58,726 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,508 psi | 89% | 3009 fps | 99.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 57,812 psi | 89% | 3009 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 58,421 psi | 90% | 2933 fps | 99.4% |
| Bofors RP15 | <<locked>> | 86% | 58,784 psi | 90% | 2956 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 58,668 psi | 90% | 2976 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,535 psi | 85% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,883 psi | 86% | 2920 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,956 psi | 88% | 2900 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,057 psi | 86% | 2887 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 86% | 54,781 psi | 84% | 2982 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,116 psi | 59% | 1870 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,956 psi | 88% | 2874 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 57,479 psi | 88% | 2956 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,593 psi | 86% | 2835 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,479 psi | 88% | 2972 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 57,551 psi | 89% | 2844 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,390 psi | 85% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 55,027 psi | 85% | 2920 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 57,522 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,320 psi | 61% | 1916 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,463 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,668 psi | 90% | 3009 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,855 psi | 88% | 2930 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,726 psi | 90% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 55,825 psi | 86% | 2835 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,317 psi | 85% | 2874 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 86% | 56,594 psi | 87% | 2930 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 58,784 psi | 90% | 3009 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 56,463 psi | 87% | 3012 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,448 psi | 85% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,317 psi | 85% | 2841 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% | 51,663 psi | 80% | 2756 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 44,295 psi | 68% | 2726 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 80% | 54,433 psi | 84% | 2917 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 51,155 psi | 79% | 2851 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 38,595 psi | 59% | 2602 fps | 98.2% |
| ADI AR 2218 | 75.7 gr | 86% | 41,060 psi | 63% | 2740 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 35,955 psi | 55% | 2575 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,880 psi | 80% | 2844 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,734 psi | 78% | 2762 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,759 psi | 69% | 2723 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 42,757 psi | 66% | 2733 fps | 95.9% |
| Alliant Reloder-50 | 78.6 gr | 88% | 43,033 psi | 66% | 2730 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,167 psi | 74% | 2756 fps | 97.8% |
| Bofors RP15 | <<locked>> | 80% | 48,414 psi | 75% | 2785 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 41,887 psi | 64% | 2677 fps | 98.9% |
| Bofors RP5 | <<locked>> | 80% | 51,880 psi | 80% | 2844 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,959 psi | 65% | 2674 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 80% | 53,229 psi | 82% | 2838 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,388 psi | 81% | 2825 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,280 psi | 68% | 2799 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 44% | 1673 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,359 psi | 82% | 2815 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 50,111 psi | 77% | 2838 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 52,243 psi | 80% | 2779 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 33,547 psi | 52% | 2493 fps | 96.1% |
| Lovex S071 | <<locked>> | 80% | 44,657 psi | 69% | 2635 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,127 psi | 53% | 2523 fps | 98.4% |
| Ramshot Grand | <<locked>> | 80% | 51,169 psi | 79% | 2858 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 46,238 psi | 71% | 2730 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,588 psi | 46% | 1713 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,932 psi | 68% | 2772 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 40,393 psi | 62% | 2671 fps | 97.3% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 43,395 psi | 67% | 2684 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 55,085 psi | 85% | 2871 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 49,008 psi | 75% | 2726 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 45,194 psi | 70% | 2687 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 80% | 46,253 psi | 71% | 2749 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 41,263 psi | 64% | 2684 fps | 97% |
| Vihtavuori N570 | 70.7 gr | 82% | 42,467 psi | 65% | 2740 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,547 psi | 79% | 2848 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,648 psi | 79% | 2782 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 41 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 150gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,031 fps. Accurate 8700 gives the best case fill at 100 %, and 41 of the 41 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 150.0 gr projectile in 0.264" calls for a 1:8.0 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-50 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 150gr | 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.