Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Barnes Match Burner BT bullet and 49 powders. The key underlying parameters are shown in the table above.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 56,898 psi | 88% | 2923 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,881 psi | 81% | 2963 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 82% | 56,188 psi | 86% | 3031 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 57,783 psi | 89% | 3009 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,695 psi | 87% | 3028 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 56,333 psi | 87% | 3018 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,869 psi | 88% | 3146 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 56,014 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,188 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,276 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,651 psi | 86% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,579 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,027 psi | 85% | 3048 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,100 psi | 85% | 3041 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,666 psi | 87% | 2989 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 56,724 psi | 87% | 3012 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,275 psi | 87% | 3025 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,276 psi | 88% | 3022 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,725 psi | 89% | 3035 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,100 psi | 85% | 2956 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,001 psi | 89% | 3002 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,362 psi | 87% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1932 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 58,784 psi | 90% | 2992 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,303 psi | 85% | 3012 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,522 psi | 89% | 2946 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,027 psi | 85% | 3022 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,593 psi | 86% | 2904 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,507 psi | 87% | 3041 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,406 psi | 88% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,927 psi | 88% | 3041 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,288 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,160 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,087 psi | 88% | 3084 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,985 psi | 86% | 3051 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 57,885 psi | 89% | 2976 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,188 psi | 88% | 2992 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,491 psi | 84% | 2969 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,826 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,450 psi | 88% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,638 psi | 89% | 2949 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,971 psi | 88% | 2979 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 57,290 psi | 88% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,637 psi | 87% | 3038 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,305 psi | 90% | 3045 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,362 psi | 87% | 3054 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 58,117 psi | 89% | 3123 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,898 psi | 88% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,174 psi | 88% | 2956 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 49,937 psi | 77% | 2815 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,629 psi | 70% | 2828 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 52,330 psi | 81% | 2966 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 53,998 psi | 83% | 2949 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,356 psi | 76% | 2900 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 36,927 psi | 57% | 2635 fps | 97% |
| ADI AR 2218 | <<locked>> | 90% | 45,585 psi | 70% | 2917 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,272 psi | 53% | 2608 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,766 psi | 83% | 2940 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,111 psi | 77% | 2900 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,805 psi | 75% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,004 psi | 66% | 2772 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,918 psi | 68% | 2831 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,572 psi | 73% | 2900 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,615 psi | 72% | 2802 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 46,586 psi | 72% | 2835 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 40,234 psi | 62% | 2717 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 50,111 psi | 77% | 2900 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,263 psi | 62% | 2717 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,517 psi | 79% | 2894 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,691 psi | 78% | 2877 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,119 psi | 65% | 2835 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 44% | 1729 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,866 psi | 80% | 2874 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 48,269 psi | 74% | 2887 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,056 psi | 83% | 2887 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,156 psi | 53% | 2582 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 43,047 psi | 66% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,372 psi | 50% | 2546 fps | 97% |
| Norma MRP | <<locked>> | 80% | 53,650 psi | 83% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,052 psi | 75% | 2904 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,266 psi | 68% | 2772 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,916 psi | 65% | 2815 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,464 psi | 59% | 2697 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 54,215 psi | 83% | 2917 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,693 psi | 83% | 2933 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,572 psi | 73% | 2841 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,345 psi | 82% | 2930 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,838 psi | 83% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,413 psi | 73% | 2779 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 49,850 psi | 77% | 2854 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 53,606 psi | 83% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,982 psi | 82% | 2976 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,512 psi | 69% | 2792 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 39,436 psi | 61% | 2713 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 86% | 46,804 psi | 72% | 2910 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,979 psi | 75% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,966 psi | 77% | 2835 fps | 99.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 55 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Barnes Match Burner BT. ADI AR 2218 delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,146 fps. Accurate 8700 gives the best case fill at 100 %, and 55 of the 55 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 140.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.