Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 144gr | Lapua MaxRange Target OTM bullet and 47 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>> | 84% | 58,073 psi | 89% | 2904 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,375 psi | 84% | 2956 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 82% | 57,450 psi | 88% | 3018 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 57,928 psi | 89% | 3012 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,696 psi | 89% | 3002 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 58,421 psi | 90% | 3136 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 57,522 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 58,291 psi | 90% | 2976 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 58,494 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,840 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,885 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,246 psi | 87% | 3038 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,666 psi | 87% | 3035 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,682 psi | 89% | 2972 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 57,885 psi | 89% | 2995 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,551 psi | 89% | 3012 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 58,494 psi | 90% | 3005 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,027 psi | 85% | 2959 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,188 psi | 86% | 2940 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,317 psi | 85% | 2923 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,870 psi | 89% | 3084 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,072 psi | 59% | 1909 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,304 psi | 87% | 2917 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 56,550 psi | 87% | 2995 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,537 psi | 90% | 2930 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,420 psi | 87% | 3009 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,492 psi | 87% | 2881 fps | 100% |
| Norma 217 | <<locked>> | 96% | 58,030 psi | 89% | 3028 fps | 100% |
| Norma MRP | <<locked>> | 82% | 58,682 psi | 90% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,320 psi | 90% | 3025 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,608 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,247 psi | 60% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 58,682 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,479 psi | 88% | 3041 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 58,334 psi | 90% | 2972 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,854 psi | 86% | 2959 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,972 psi | 89% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,552 psi | 90% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,784 psi | 90% | 2930 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 58,175 psi | 90% | 2969 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 58,465 psi | 90% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,870 psi | 89% | 3025 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 55,608 psi | 86% | 2963 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 57,769 psi | 89% | 3041 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 55,448 psi | 85% | 3045 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 58,421 psi | 90% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 58,320 psi | 90% | 2936 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% | 50,778 psi | 78% | 2792 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,511 psi | 67% | 2753 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 53,519 psi | 82% | 2953 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 50,415 psi | 78% | 2887 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 37,811 psi | 58% | 2628 fps | 97.6% |
| ADI AR 2218 | 78.6 gr | 88% | 43,424 psi | 67% | 2835 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 35,186 psi | 54% | 2602 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,607 psi | 84% | 2917 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,155 psi | 79% | 2884 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,879 psi | 77% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,077 psi | 68% | 2759 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,930 psi | 65% | 2759 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 90% | 45,498 psi | 70% | 2825 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,485 psi | 73% | 2789 fps | 97.3% |
| Bofors RP15 | <<locked>> | 80% | 47,587 psi | 73% | 2818 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 41,046 psi | 63% | 2703 fps | 98.4% |
| Bofors RP5 | <<locked>> | 80% | 51,155 psi | 79% | 2884 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,249 psi | 63% | 2707 fps | 99% |
| Hodgdon H4831 | <<locked>> | 80% | 52,547 psi | 81% | 2877 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,706 psi | 80% | 2864 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,279 psi | 67% | 2825 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,703 psi | 44% | 1709 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,794 psi | 81% | 2854 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 49,182 psi | 76% | 2867 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,547 psi | 79% | 2812 fps | 95% |
| IMR 8133 Enduron | 65.6 gr | 80% | 32,808 psi | 50% | 2516 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 43,961 psi | 68% | 2674 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,344 psi | 51% | 2546 fps | 97.8% |
| Norma MRP | <<locked>> | 80% | 54,868 psi | 84% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,299 psi | 77% | 2894 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 45,397 psi | 70% | 2759 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 45% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,163 psi | 66% | 2805 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,523 psi | 61% | 2694 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 54,534 psi | 84% | 2913 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,585 psi | 70% | 2769 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,186 psi | 83% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,868 psi | 84% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,167 psi | 74% | 2759 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,674 psi | 73% | 2782 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 54,723 psi | 84% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 54,143 psi | 83% | 2963 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 45,513 psi | 70% | 2779 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 80% | 40,495 psi | 62% | 2710 fps | 96.3% |
| Vihtavuori N570 | 73.5 gr | 84% | 44,802 psi | 69% | 2838 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,357 psi | 78% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,937 psi | 78% | 2822 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 47 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 144gr | Lapua MaxRange Target OTM. ADI AR 2218 delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,136 fps. Accurate 8700 gives the best case fill at 100 %, and 47 of the 47 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 1:9.0 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, IMR 8133 Enduron rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 144gr | Lapua MaxRange Target OTM 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.