Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 139gr | Brenneke TOG 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, Hodgdon Retumbo and Vihtavuori N570.
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% | 57,116 psi | 88% | 2933 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,069 psi | 82% | 2972 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 82% | 56,347 psi | 87% | 3045 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 58,001 psi | 89% | 3022 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,898 psi | 88% | 3041 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 56,434 psi | 87% | 3028 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,319 psi | 88% | 3159 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 56,347 psi | 87% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,392 psi | 88% | 3009 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,464 psi | 88% | 3031 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,869 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,739 psi | 87% | 3018 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,259 psi | 85% | 3061 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,521 psi | 85% | 3058 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,927 psi | 88% | 2999 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 56,884 psi | 88% | 3025 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,623 psi | 87% | 3038 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,464 psi | 88% | 3031 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,856 psi | 89% | 3045 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,288 psi | 85% | 2966 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,189 psi | 90% | 3012 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,550 psi | 87% | 3110 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,101 psi | 59% | 1942 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,535 psi | 85% | 2946 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 84% | 55,477 psi | 85% | 3025 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,827 psi | 89% | 2959 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,332 psi | 85% | 3035 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,782 psi | 86% | 2913 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,840 psi | 87% | 3054 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,812 psi | 89% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,087 psi | 88% | 3051 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,405 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 60% | 1988 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,435 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,492 psi | 87% | 3068 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 58,102 psi | 89% | 2989 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,406 psi | 88% | 3002 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2982 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,043 psi | 88% | 2999 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,638 psi | 89% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,783 psi | 89% | 2959 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,261 psi | 88% | 2992 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 57,537 psi | 89% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,029 psi | 88% | 3054 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,436 psi | 90% | 3051 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,666 psi | 87% | 3068 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 58,407 psi | 90% | 3136 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,072 psi | 88% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,348 psi | 88% | 2966 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% | 49,966 psi | 77% | 2822 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,847 psi | 71% | 2835 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 52,533 psi | 81% | 2979 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 54,201 psi | 83% | 2963 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,545 psi | 76% | 2910 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 37,115 psi | 57% | 2648 fps | 97% |
| ADI AR 2218 | 81.1 gr | 90% | 45,832 psi | 71% | 2930 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,461 psi | 53% | 2618 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,780 psi | 83% | 2949 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,285 psi | 77% | 2910 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,037 psi | 75% | 2831 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,207 psi | 66% | 2785 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 44,222 psi | 68% | 2848 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,819 psi | 74% | 2910 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,746 psi | 72% | 2815 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 46,804 psi | 72% | 2844 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 40,263 psi | 62% | 2726 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 50,285 psi | 77% | 2910 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,451 psi | 62% | 2726 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,721 psi | 80% | 2907 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,894 psi | 78% | 2890 fps | 99.2% |
| Hodgdon Retumbo | 68 gr | 80% | 42,351 psi | 65% | 2848 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,660 psi | 44% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,083 psi | 80% | 2887 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 48,298 psi | 74% | 2894 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,157 psi | 83% | 2897 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,360 psi | 53% | 2595 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 43,279 psi | 67% | 2697 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,561 psi | 50% | 2559 fps | 97.1% |
| Norma MRP | <<locked>> | 80% | 53,867 psi | 83% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,255 psi | 76% | 2917 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,469 psi | 68% | 2782 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 45% | 1778 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,105 psi | 65% | 2825 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,740 psi | 60% | 2710 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 54,447 psi | 84% | 2933 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,708 psi | 83% | 2943 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,776 psi | 74% | 2851 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,359 psi | 82% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,027 psi | 83% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,413 psi | 73% | 2789 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 50,111 psi | 77% | 2867 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 53,838 psi | 83% | 2910 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,171 psi | 82% | 2986 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,686 psi | 69% | 2802 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 39,784 psi | 61% | 2730 fps | 95.6% |
| Vihtavuori N570 | 75.9 gr | 86% | 47,123 psi | 73% | 2923 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,429 psi | 76% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,154 psi | 77% | 2848 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 55 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 139gr | Brenneke TOG. ADI AR 2218 delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,159 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 139.0 gr projectile in 0.264" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, 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. ADI AR 2218, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 139gr | Brenneke TOG they combine a high case fill with complete burn and sit in the upper velocity band. 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.