Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 156gr | Berger Elite Hunter bullet and 42 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 56,507 psi | 87% | 2779 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,884 psi | 88% | 2900 fps | 99% |
| ADI AR 2213 | <<locked>> | 82% | 56,159 psi | 86% | 2881 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,057 psi | 86% | 2874 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,956 psi | 88% | 3015 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 92% | 56,304 psi | 87% | 2900 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,782 psi | 87% | 2874 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,288 psi | 85% | 2779 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,434 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,853 psi | 84% | 2920 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,317 psi | 85% | 2920 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,028 psi | 86% | 2848 fps | 99.4% |
| Bofors RP15 | <<locked>> | 84% | 56,463 psi | 87% | 2871 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,260 psi | 87% | 2887 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,782 psi | 87% | 2874 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,421 psi | 88% | 2890 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 58,175 psi | 90% | 2867 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,232 psi | 88% | 2854 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,434 psi | 87% | 2956 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 59% | 1837 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 58,030 psi | 89% | 2841 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,100 psi | 85% | 2871 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,724 psi | 87% | 2808 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,143 psi | 85% | 2887 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 58,320 psi | 90% | 2867 fps | 96.4% |
| Lovex S071 | <<locked>> | 88% | 58,798 psi | 90% | 2808 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,101 psi | 88% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,492 psi | 87% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 54,810 psi | 84% | 2818 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,334 psi | 61% | 1880 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,000 psi | 88% | 2936 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,927 psi | 86% | 2913 fps | 99.9% |
| Shooters World 50 BMG | <<locked>> | 92% | 58,320 psi | 90% | 2867 fps | 96.4% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 58,334 psi | 90% | 2904 fps | 99% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,692 psi | 80% | 2815 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 84% | 57,000 psi | 88% | 2802 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,434 psi | 87% | 2844 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 86% | 58,015 psi | 89% | 2900 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,231 psi | 87% | 2917 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 58,175 psi | 90% | 2992 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,101 psi | 88% | 2871 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,492 psi | 87% | 2808 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% | 52,765 psi | 81% | 2723 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 42,598 psi | 66% | 2648 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 80% | 52,344 psi | 81% | 2818 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,595 psi | 61% | 2579 fps | 98.8% |
| ADI AR 2218 | 73.5 gr | 84% | 39,262 psi | 60% | 2654 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 36,999 psi | 57% | 2556 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,055 psi | 82% | 2815 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,866 psi | 80% | 2726 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,122 psi | 71% | 2697 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 40,930 psi | 63% | 2648 fps | 95.7% |
| Alliant Reloder-50 | 76.4 gr | 86% | 41,350 psi | 64% | 2651 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,168 psi | 76% | 2730 fps | 98.4% |
| Bofors RP15 | <<locked>> | 80% | 49,516 psi | 76% | 2756 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,004 psi | 66% | 2654 fps | 99.3% |
| Bofors RP5 | <<locked>> | 80% | 53,055 psi | 82% | 2815 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,265 psi | 67% | 2654 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 54,549 psi | 84% | 2812 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,490 psi | 82% | 2795 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,643 psi | 70% | 2772 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 44% | 1640 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,549 psi | 84% | 2789 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,329 psi | 79% | 2808 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 84% | 50,024 psi | 77% | 2694 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,505 psi | 53% | 2477 fps | 97% |
| Lovex D100 | <<locked>> | 90% | 54,505 psi | 84% | 2805 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 45,818 psi | 71% | 2612 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,215 psi | 54% | 2503 fps | 99% |
| Ramshot Grand | <<locked>> | 80% | 52,562 psi | 81% | 2831 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,485 psi | 73% | 2703 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,704 psi | 46% | 1680 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,368 psi | 70% | 2749 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,655 psi | 64% | 2654 fps | 98% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,505 psi | 84% | 2805 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,568 psi | 64% | 2602 fps | 95.1% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,196 psi | 74% | 2753 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 80% | 50,024 psi | 77% | 2697 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,279 psi | 67% | 2605 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 80% | 47,413 psi | 73% | 2723 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 80% | 42,424 psi | 65% | 2661 fps | 97.8% |
| Vihtavuori N570 | 68.6 gr | 80% | 40,712 psi | 63% | 2654 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,084 psi | 82% | 2818 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,765 psi | 81% | 2753 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 42 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 156gr | Berger Elite Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,015 fps. Accurate 8700 gives the best case fill at 100 %, and 42 of the 42 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 1:8.0 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 | 156gr | Berger Elite Hunter 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.