Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 159gr | RWS TMR bullet and 35 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Alliant Reloder-50 and Alliant Reloder-33.
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 8700 | <<locked>> | 98% | 57,276 psi | 88% | 2881 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 88% | 56,188 psi | 86% | 2848 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 57,261 psi | 88% | 2989 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 90% | 56,594 psi | 87% | 2871 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 58,581 psi | 90% | 2792 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 56,159 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 55,114 psi | 85% | 2894 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 92% | 55,898 psi | 86% | 2897 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 55,201 psi | 85% | 2812 fps | 99.5% |
| Bofors RP15 | <<locked>> | 82% | 56,072 psi | 86% | 2838 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 56,333 psi | 87% | 2861 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 57,276 psi | 88% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 56,623 psi | 87% | 2923 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,334 psi | 59% | 1834 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 57,464 psi | 88% | 2881 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 58,407 psi | 90% | 2894 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 86% | 56,144 psi | 86% | 2782 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 55,608 psi | 86% | 2864 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 58,044 psi | 89% | 2841 fps | 96.8% |
| Lovex S071 | <<locked>> | 86% | 58,247 psi | 90% | 2779 fps | 100% |
| Norma 217 | <<locked>> | 92% | 57,377 psi | 88% | 2884 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 56,420 psi | 87% | 2917 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 84% | 58,595 psi | 90% | 2844 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,537 psi | 61% | 1880 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 57,145 psi | 88% | 2907 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 56,014 psi | 86% | 2887 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 58,044 psi | 89% | 2841 fps | 96.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 58,668 psi | 90% | 2884 fps | 99.2% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 55,999 psi | 86% | 2864 fps | 97.7% |
| Vihtavuori 24N41 | <<locked>> | 94% | 58,030 psi | 89% | 2890 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 82% | 56,391 psi | 87% | 2769 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 56,144 psi | 86% | 2818 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 57,711 psi | 89% | 2871 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 56,391 psi | 87% | 2894 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 58,305 psi | 90% | 2963 fps | 99.5% |
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 8700 | <<locked>> | 88% | 39,958 psi | 61% | 2566 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 80% | 42,525 psi | 65% | 2612 fps | 99.5% |
| ADI AR 2218 | 75 gr | 82% | 39,305 psi | 60% | 2631 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 39,958 psi | 61% | 2589 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 54,926 psi | 85% | 2746 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 49,153 psi | 76% | 2720 fps | 100% |
| Alliant Reloder-33 | 74.5 gr | 80% | 41,017 psi | 63% | 2621 fps | 96.1% |
| Alliant Reloder-50 | 78 gr | 84% | 41,742 psi | 64% | 2625 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 51,735 psi | 80% | 2753 fps | 99% |
| Bofors RP15 | <<locked>> | 80% | 52,576 psi | 81% | 2782 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 45,992 psi | 71% | 2684 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 46,340 psi | 71% | 2684 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 49,269 psi | 76% | 2808 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,993 psi | 45% | 1640 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 53,679 psi | 83% | 2815 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 80% | 54,607 psi | 84% | 2835 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 46,282 psi | 71% | 2608 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 37,173 psi | 57% | 2513 fps | 98.2% |
| Lovex D100 | <<locked>> | 86% | 50,430 psi | 78% | 2713 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 48,443 psi | 75% | 2631 fps | 100% |
| Norma 217 | <<locked>> | 80% | 38,218 psi | 59% | 2543 fps | 99.7% |
| Ramshot LRT | <<locked>> | 90% | 52,605 psi | 81% | 2851 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 50,734 psi | 78% | 2730 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,805 psi | 46% | 1680 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 49,124 psi | 76% | 2782 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 44,904 psi | 69% | 2690 fps | 99% |
| Shooters World 50 BMG | <<locked>> | 86% | 50,430 psi | 78% | 2713 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 41,814 psi | 64% | 2582 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 96% | 48,617 psi | 75% | 2733 fps | 95.9% |
| Vihtavuori 24N41 | <<locked>> | 92% | 54,099 psi | 83% | 2825 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 52,895 psi | 81% | 2720 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 45,905 psi | 71% | 2635 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 80% | 50,546 psi | 78% | 2753 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 45,716 psi | 70% | 2703 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 80% | 43,859 psi | 68% | 2697 fps | 96.6% |
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 35 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 159gr | RWS TMR. ADI AR 2218 delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,834 fps to 2,989 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 35 of the 35 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 159.0 gr projectile in 0.264" calls for a 1:11.5 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, Alliant Reloder-50, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 159gr | RWS TMR 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.