Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 145gr | Barnes Match Burner BT bullet and 49 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 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 3100 | <<locked>> | 84% | 57,421 psi | 88% | 2884 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,185 psi | 82% | 2930 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 82% | 56,565 psi | 87% | 2995 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 58,189 psi | 90% | 2969 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,014 psi | 88% | 2989 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,637 psi | 87% | 2979 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,348 psi | 88% | 3110 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 56,463 psi | 87% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,609 psi | 89% | 2956 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,566 psi | 89% | 2982 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,115 psi | 86% | 2887 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,000 psi | 88% | 2966 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,390 psi | 85% | 3015 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,593 psi | 86% | 3012 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,072 psi | 88% | 2953 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 57,246 psi | 88% | 2976 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,753 psi | 87% | 2989 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,566 psi | 89% | 2982 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 58,001 psi | 89% | 2992 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,564 psi | 86% | 2917 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,291 psi | 90% | 2959 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,884 psi | 88% | 3064 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 59% | 1896 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,695 psi | 86% | 2894 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 55,854 psi | 86% | 2976 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,870 psi | 89% | 2907 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,419 psi | 85% | 2986 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,811 psi | 86% | 2861 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,217 psi | 88% | 3009 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,972 psi | 89% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,363 psi | 88% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,579 psi | 86% | 2923 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 60% | 1942 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,580 psi | 89% | 3045 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,550 psi | 87% | 3018 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 58,276 psi | 90% | 2936 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,595 psi | 89% | 2949 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,911 psi | 85% | 2936 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,232 psi | 88% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,885 psi | 89% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,943 psi | 89% | 2907 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,348 psi | 88% | 2946 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 82% | 57,667 psi | 89% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,232 psi | 88% | 3005 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 58,581 psi | 90% | 3002 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,768 psi | 87% | 3018 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 58,610 psi | 90% | 3091 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,334 psi | 88% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,711 psi | 89% | 2917 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% | 50,256 psi | 77% | 2776 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,948 psi | 71% | 2795 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 52,663 psi | 81% | 2930 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 80% | 54,317 psi | 84% | 2907 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,734 psi | 77% | 2864 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 37,347 psi | 57% | 2608 fps | 97.5% |
| ADI AR 2218 | 77.2 gr | 88% | 42,656 psi | 66% | 2812 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 34,577 psi | 53% | 2579 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,114 psi | 83% | 2900 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,473 psi | 78% | 2864 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,110 psi | 76% | 2779 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,337 psi | 67% | 2740 fps | 100% |
| Alliant Reloder-33 | 76.8 gr | 86% | 44,266 psi | 68% | 2802 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,672 psi | 69% | 2802 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,992 psi | 72% | 2772 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 47,065 psi | 72% | 2799 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 40,567 psi | 62% | 2684 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 50,473 psi | 78% | 2864 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,596 psi | 62% | 2684 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 80% | 51,880 psi | 80% | 2858 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,024 psi | 79% | 2841 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,540 psi | 65% | 2805 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 44% | 1696 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,170 psi | 80% | 2838 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 48,660 psi | 75% | 2851 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,346 psi | 84% | 2851 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,169 psi | 50% | 2493 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,424 psi | 67% | 2651 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,837 psi | 51% | 2526 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 53,925 psi | 83% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,559 psi | 76% | 2871 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 44,556 psi | 69% | 2736 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,457 psi | 45% | 1736 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,293 psi | 65% | 2782 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,957 psi | 60% | 2674 fps | 96.3% |
| Rottweil R 904 | <<locked>> | 80% | 54,476 psi | 84% | 2877 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 53,998 psi | 83% | 2894 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,831 psi | 69% | 2749 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,679 psi | 83% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,186 psi | 83% | 2861 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,718 psi | 73% | 2743 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,992 psi | 72% | 2759 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 54,128 psi | 83% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,243 psi | 82% | 2936 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 44,875 psi | 69% | 2759 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 39,885 psi | 61% | 2687 fps | 96.1% |
| Vihtavuori N570 | 72.2 gr | 84% | 44,034 psi | 68% | 2812 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,472 psi | 76% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,299 psi | 77% | 2802 fps | 99.9% |
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 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 145gr | Barnes Match Burner BT. ADI AR 2218 delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,110 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 145.0 gr projectile in 0.264" calls for a 1:8.0 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, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 145gr | Barnes Match Burner BT 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.