Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 156gr | Norma ORYX bullet and 40 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 IMR 8133 Enduron.
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>> | 82% | 57,928 psi | 89% | 2795 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 55,013 psi | 85% | 2871 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 82% | 57,653 psi | 89% | 2904 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,914 psi | 89% | 2900 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 54,766 psi | 84% | 2972 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 92% | 58,189 psi | 90% | 2923 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 58,218 psi | 90% | 2894 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 56,855 psi | 88% | 2799 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 58,160 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,956 psi | 88% | 2949 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 57,566 psi | 89% | 2949 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 57,276 psi | 88% | 2867 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 57,899 psi | 89% | 2890 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,899 psi | 89% | 2910 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 58,218 psi | 90% | 2894 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 55,288 psi | 85% | 2858 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 58,610 psi | 90% | 2874 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 58,349 psi | 90% | 2979 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1844 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 56,608 psi | 87% | 2894 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 58,044 psi | 89% | 2831 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 57,159 psi | 88% | 2913 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 56,057 psi | 86% | 2831 fps | 96.1% |
| Lovex S071 | <<locked>> | 86% | 56,608 psi | 87% | 2779 fps | 100% |
| Norma 217 | <<locked>> | 92% | 55,085 psi | 85% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 58,334 psi | 90% | 2917 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 58,218 psi | 90% | 2969 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 84% | 56,623 psi | 87% | 2844 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,479 psi | 61% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 54,969 psi | 85% | 2904 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,870 psi | 89% | 2943 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 56,057 psi | 86% | 2831 fps | 96.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 56,536 psi | 87% | 2874 fps | 98.8% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2848 fps | 97% |
| Vihtavuori N165 | <<locked>> | 84% | 58,537 psi | 90% | 2825 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 58,146 psi | 89% | 2874 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 55,825 psi | 86% | 2864 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 58,247 psi | 90% | 2946 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 56,057 psi | 86% | 2953 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 82% | 58,044 psi | 89% | 2831 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% | 54,230 psi | 83% | 2743 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 41,031 psi | 63% | 2608 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 80% | 53,838 psi | 83% | 2841 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,944 psi | 63% | 2605 fps | 99.1% |
| ADI AR 2218 | 75.5 gr | 84% | 40,654 psi | 63% | 2684 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 38,348 psi | 59% | 2579 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 54,520 psi | 84% | 2838 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 53,200 psi | 82% | 2746 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 47,442 psi | 73% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 39,320 psi | 61% | 2605 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 86% | 43,033 psi | 66% | 2680 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,459 psi | 78% | 2753 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 50,952 psi | 78% | 2779 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 44,396 psi | 68% | 2677 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 54,520 psi | 84% | 2838 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 44,686 psi | 69% | 2677 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 54,853 psi | 84% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 47,297 psi | 73% | 2799 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 44% | 1647 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 52,837 psi | 81% | 2831 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,906 psi | 74% | 2657 fps | 95.1% |
| IMR 8133 Enduron | 66 gr | 80% | 35,665 psi | 55% | 2500 fps | 97.5% |
| Lovex D100 | <<locked>> | 88% | 52,272 psi | 80% | 2766 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 46,876 psi | 72% | 2628 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,593 psi | 56% | 2530 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 54,143 psi | 83% | 2854 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 54,201 psi | 83% | 2900 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 80% | 48,863 psi | 75% | 2723 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,747 psi | 46% | 1690 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 47,065 psi | 72% | 2772 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 43,105 psi | 66% | 2680 fps | 98.4% |
| Shooters World 50 BMG | <<locked>> | 88% | 52,272 psi | 80% | 2766 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 43,091 psi | 66% | 2631 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,630 psi | 72% | 2720 fps | 95% |
| Vihtavuori N165 | <<locked>> | 80% | 51,358 psi | 79% | 2717 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,396 psi | 68% | 2625 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 80% | 48,762 psi | 75% | 2746 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 43,947 psi | 68% | 2690 fps | 98.2% |
| Vihtavuori N570 | 70.4 gr | 80% | 42,061 psi | 65% | 2680 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 54,085 psi | 83% | 2772 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 40 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 156gr | Norma ORYX. Hodgdon Retumbo delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,844 fps to 2,979 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 40 of the 40 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 156.0 gr projectile in 0.264" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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, IMR 8133 Enduron rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 156gr | Norma ORYX 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.