Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 160gr | Woodleigh PP SN bullet and 39 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% | 58,175 psi | 90% | 2766 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 55,317 psi | 85% | 2848 fps | 99% |
| ADI AR 2213 | <<locked>> | 82% | 58,146 psi | 89% | 2877 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 58,349 psi | 90% | 2874 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 55,216 psi | 85% | 2953 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 92% | 58,740 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 58,711 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 57,043 psi | 88% | 2766 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 58,508 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 57,159 psi | 88% | 2920 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 57,841 psi | 89% | 2927 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 57,609 psi | 89% | 2841 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 58,160 psi | 90% | 2861 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 58,276 psi | 90% | 2884 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 58,711 psi | 90% | 2871 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 55,680 psi | 86% | 2831 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 58,784 psi | 90% | 2949 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,392 psi | 59% | 1821 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 56,855 psi | 88% | 2864 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 58,349 psi | 90% | 2805 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 57,450 psi | 88% | 2887 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 56,362 psi | 87% | 2805 fps | 96.4% |
| Lovex S071 | <<locked>> | 86% | 57,043 psi | 88% | 2753 fps | 100% |
| Norma 217 | <<locked>> | 92% | 55,564 psi | 86% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 58,682 psi | 90% | 2890 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 58,653 psi | 90% | 2946 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 84% | 57,058 psi | 88% | 2818 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,436 psi | 61% | 1864 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 55,259 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 58,247 psi | 90% | 2917 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 56,362 psi | 87% | 2805 fps | 96.4% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 56,724 psi | 87% | 2848 fps | 99% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,954 psi | 83% | 2825 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 84% | 58,784 psi | 90% | 2795 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 58,349 psi | 90% | 2844 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 84% | 56,144 psi | 86% | 2838 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 58,523 psi | 90% | 2920 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 56,376 psi | 87% | 2927 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 82% | 58,320 psi | 90% | 2802 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% | 54,621 psi | 84% | 2720 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 41,307 psi | 64% | 2592 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 80% | 54,244 psi | 83% | 2818 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 41,118 psi | 63% | 2582 fps | 99.3% |
| ADI AR 2218 | 72.8 gr | 82% | 38,101 psi | 59% | 2595 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 38,551 psi | 59% | 2559 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 54,926 psi | 85% | 2812 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 53,563 psi | 82% | 2720 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 47,834 psi | 74% | 2694 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 39,639 psi | 61% | 2589 fps | 95.6% |
| Alliant Reloder-50 | 75.7 gr | 84% | 40,277 psi | 62% | 2592 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,676 psi | 78% | 2726 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 51,126 psi | 79% | 2749 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 44,788 psi | 69% | 2657 fps | 99.7% |
| Bofors RP5 | <<locked>> | 80% | 54,926 psi | 85% | 2812 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 44,918 psi | 69% | 2654 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 47,558 psi | 73% | 2772 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,935 psi | 45% | 1627 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 53,055 psi | 82% | 2802 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 48,254 psi | 74% | 2635 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,998 psi | 55% | 2484 fps | 97.8% |
| Lovex D100 | <<locked>> | 88% | 52,547 psi | 81% | 2743 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 47,166 psi | 73% | 2602 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,811 psi | 57% | 2507 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 54,650 psi | 84% | 2831 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 54,621 psi | 84% | 2877 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 80% | 49,356 psi | 76% | 2703 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,747 psi | 46% | 1667 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 47,442 psi | 73% | 2749 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 43,453 psi | 67% | 2657 fps | 98.7% |
| Shooters World 50 BMG | <<locked>> | 88% | 52,547 psi | 81% | 2743 fps | 95.4% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 40,480 psi | 62% | 2549 fps | 95% |
| Vihtavuori 20N29 | <<locked>> | 96% | 47,021 psi | 72% | 2700 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 80% | 51,735 psi | 80% | 2694 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,817 psi | 69% | 2605 fps | 96% |
| Vihtavuori N565 | <<locked>> | 80% | 49,182 psi | 76% | 2723 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 44,208 psi | 68% | 2667 fps | 98.4% |
| Vihtavuori N570 | 69.6 gr | 80% | 42,511 psi | 65% | 2664 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 80% | 54,505 psi | 84% | 2746 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 | 160gr | Woodleigh PP SN. ADI AR 2218 delivers the highest muzzle velocity at 2,953 fps; across all powders the maximum-charge window runs from 1,821 fps to 2,953 fps. Hodgdon TrailBoss 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 160.0 gr projectile in 0.264" calls for a 1:9.5 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, Alliant Reloder-50 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 160gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.