Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 144gr | Lapua FMJ Boat Tail 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 ReloadSwiss RS 80.
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% | 55,143 psi | 85% | 2861 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,201 psi | 85% | 2969 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 82% | 58,015 psi | 89% | 3028 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 58,508 psi | 90% | 3022 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 58,494 psi | 90% | 3012 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,027 psi | 85% | 3077 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 58,581 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,303 psi | 85% | 2953 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,464 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 58,508 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,421 psi | 88% | 3054 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 96% | 57,783 psi | 89% | 3054 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 58,334 psi | 90% | 2982 fps | 99.2% |
| Bofors RP15 | <<locked>> | 86% | 58,697 psi | 90% | 3009 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 58,378 psi | 90% | 3022 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,303 psi | 85% | 2953 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,840 psi | 86% | 2969 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,971 psi | 88% | 2949 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,883 psi | 86% | 2933 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 86% | 54,592 psi | 84% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,203 psi | 59% | 1916 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,826 psi | 87% | 2927 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 57,377 psi | 88% | 3009 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,477 psi | 85% | 2884 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,421 psi | 88% | 3022 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 57,305 psi | 88% | 2890 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,172 psi | 85% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 54,926 psi | 85% | 2972 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 57,392 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,189 psi | 60% | 1959 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,216 psi | 85% | 3015 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,436 psi | 90% | 3054 fps | 99.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 2976 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,581 psi | 90% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 55,767 psi | 86% | 2884 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,143 psi | 85% | 2920 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 82% | 58,682 psi | 90% | 3035 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 56,347 psi | 87% | 2976 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 58,740 psi | 90% | 3058 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 56,420 psi | 87% | 3058 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,100 psi | 85% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,056 psi | 85% | 2887 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% | 51,590 psi | 79% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 44,280 psi | 68% | 2769 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 54,114 psi | 83% | 2959 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 51,053 psi | 79% | 2897 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 38,348 psi | 59% | 2641 fps | 97.8% |
| ADI AR 2218 | 79.5 gr | 88% | 44,048 psi | 68% | 2851 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 35,694 psi | 55% | 2612 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,779 psi | 80% | 2897 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,531 psi | 78% | 2812 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,701 psi | 69% | 2772 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 42,627 psi | 66% | 2772 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 90% | 46,369 psi | 71% | 2841 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,950 psi | 74% | 2799 fps | 97.5% |
| Bofors RP15 | <<locked>> | 80% | 48,182 psi | 74% | 2831 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 41,814 psi | 64% | 2720 fps | 98.6% |
| Bofors RP5 | <<locked>> | 80% | 51,779 psi | 80% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,829 psi | 64% | 2717 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 80% | 53,084 psi | 82% | 2887 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,257 psi | 80% | 2871 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,947 psi | 68% | 2841 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 44% | 1713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,330 psi | 82% | 2867 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 50,009 psi | 77% | 2884 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 52,199 psi | 80% | 2825 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 33,359 psi | 51% | 2530 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 44,570 psi | 69% | 2684 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,939 psi | 52% | 2556 fps | 98% |
| Ramshot Grand | <<locked>> | 80% | 50,952 psi | 78% | 2907 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 45,977 psi | 71% | 2772 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,544 psi | 45% | 1752 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,787 psi | 67% | 2815 fps | 100% |
| ReloadSwiss RS 80 | 73.6 gr | 80% | 40,219 psi | 62% | 2707 fps | 96.8% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 46,340 psi | 71% | 2785 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,810 psi | 84% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,921 psi | 75% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 48,109 psi | 74% | 2789 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 80% | 54,723 psi | 84% | 2969 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 46,079 psi | 71% | 2792 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 80% | 41,205 psi | 63% | 2723 fps | 96.6% |
| Vihtavuori N570 | 74.3 gr | 84% | 45,382 psi | 70% | 2844 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,285 psi | 79% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,503 psi | 79% | 2831 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 | 144gr | Lapua FMJ Boat Tail. ADI AR 2218 delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,077 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 144.0 gr projectile in 0.264" calls for a 1:9.5 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, ReloadSwiss RS 80 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 144gr | Lapua FMJ Boat Tail 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.