Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 156gr | RWS Evolution 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% | 58,088 psi | 89% | 2799 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 55,114 psi | 85% | 2871 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 82% | 57,812 psi | 89% | 2907 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 58,088 psi | 89% | 2904 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 54,911 psi | 85% | 2976 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 92% | 58,552 psi | 90% | 2927 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 58,392 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 57,014 psi | 88% | 2799 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 58,320 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 57,072 psi | 88% | 2949 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 57,653 psi | 89% | 2953 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 57,392 psi | 88% | 2871 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 58,059 psi | 89% | 2894 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 58,262 psi | 90% | 2913 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 58,392 psi | 90% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 55,448 psi | 85% | 2858 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 58,755 psi | 90% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 58,784 psi | 90% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,305 psi | 59% | 1847 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 56,782 psi | 87% | 2894 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 58,146 psi | 89% | 2835 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 57,334 psi | 88% | 2917 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 56,144 psi | 86% | 2831 fps | 96.1% |
| Lovex S071 | <<locked>> | 86% | 56,782 psi | 87% | 2782 fps | 100% |
| Norma 217 | <<locked>> | 92% | 55,448 psi | 85% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 58,508 psi | 90% | 2920 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 58,334 psi | 90% | 2969 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 84% | 56,768 psi | 87% | 2844 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,523 psi | 61% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 55,172 psi | 85% | 2907 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 58,262 psi | 90% | 2946 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 56,144 psi | 86% | 2831 fps | 96.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 56,623 psi | 87% | 2877 fps | 98.8% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,940 psi | 83% | 2854 fps | 97% |
| Vihtavuori N165 | <<locked>> | 84% | 58,682 psi | 90% | 2825 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 58,247 psi | 90% | 2874 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 84% | 55,985 psi | 86% | 2867 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 58,378 psi | 90% | 2949 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 56,202 psi | 86% | 2953 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 82% | 58,189 psi | 90% | 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% | 54,404 psi | 84% | 2746 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 41,307 psi | 64% | 2615 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 80% | 53,983 psi | 83% | 2844 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 41,104 psi | 63% | 2608 fps | 99.1% |
| ADI AR 2218 | 75.7 gr | 84% | 40,799 psi | 63% | 2690 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 38,508 psi | 59% | 2582 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 54,694 psi | 84% | 2838 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 53,388 psi | 82% | 2749 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 47,616 psi | 73% | 2720 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 39,479 psi | 61% | 2608 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 86% | 43,163 psi | 66% | 2684 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,575 psi | 78% | 2756 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 51,126 psi | 79% | 2782 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 44,556 psi | 69% | 2680 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 54,694 psi | 84% | 2838 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 44,672 psi | 69% | 2677 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 54,998 psi | 85% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 47,500 psi | 73% | 2802 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,848 psi | 44% | 1650 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 53,011 psi | 82% | 2835 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 48,022 psi | 74% | 2661 fps | 95.2% |
| IMR 8133 Enduron | 66.2 gr | 80% | 35,824 psi | 55% | 2503 fps | 97.5% |
| Lovex D100 | <<locked>> | 88% | 52,388 psi | 81% | 2769 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 47,036 psi | 72% | 2628 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,767 psi | 57% | 2533 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 54,317 psi | 84% | 2858 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 54,317 psi | 84% | 2904 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 80% | 49,008 psi | 75% | 2726 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,660 psi | 46% | 1686 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 47,282 psi | 73% | 2776 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 43,265 psi | 67% | 2680 fps | 98.5% |
| Shooters World 50 BMG | <<locked>> | 88% | 52,388 psi | 81% | 2769 fps | 95.2% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 43,236 psi | 67% | 2631 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,920 psi | 72% | 2723 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 51,517 psi | 79% | 2720 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,527 psi | 69% | 2628 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 80% | 48,907 psi | 75% | 2749 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 44,106 psi | 68% | 2694 fps | 98.2% |
| Vihtavuori N570 | 70.6 gr | 80% | 42,235 psi | 65% | 2684 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 54,244 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 | RWS Evolution. Hodgdon Retumbo delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,847 fps to 2,986 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 1:10.5 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, IMR 8133 Enduron rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 156gr | RWS Evolution 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.