Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Barnes TSX BT bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 88% | 58,784 psi | 90% | 3153 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,087 psi | 88% | 3251 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 58,088 psi | 89% | 3258 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 56,202 psi | 86% | 3186 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 86% | 54,766 psi | 84% | 3192 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 58,015 psi | 89% | 3241 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,433 psi | 84% | 3278 fps | 97.1% |
| ADI AR 2225 | <<locked>> | 98% | 57,188 psi | 88% | 3258 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,782 psi | 86% | 3169 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,187 psi | 85% | 3186 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,159 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,928 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 58,262 psi | 90% | 3248 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,304 psi | 87% | 3258 fps | 97.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,072 psi | 86% | 3238 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,506 psi | 85% | 3153 fps | 97.5% |
| Bofors RP15 | <<locked>> | 90% | 58,349 psi | 90% | 3238 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,754 psi | 89% | 3245 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,187 psi | 85% | 3186 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 92% | 55,390 psi | 85% | 3196 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 57,537 psi | 89% | 3189 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,434 psi | 87% | 3169 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,391 psi | 87% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,435 psi | 88% | 3323 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 58% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,233 psi | 90% | 3163 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,682 psi | 89% | 3166 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 57,276 psi | 88% | 3241 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,941 psi | 86% | 3225 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 56,724 psi | 87% | 3120 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 3251 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,477 psi | 85% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,769 psi | 90% | 3268 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 57,188 psi | 88% | 3189 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 60% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 58,610 psi | 90% | 3314 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,493 psi | 88% | 3264 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 56,652 psi | 87% | 3156 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 55,608 psi | 86% | 3163 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,230 psi | 85% | 3159 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 58,030 psi | 89% | 3143 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 58,624 psi | 90% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,767 psi | 86% | 3130 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,985 psi | 86% | 3120 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 55,100 psi | 85% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,897 psi | 84% | 3205 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 90% | 55,854 psi | 86% | 3196 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 57,856 psi | 89% | 3268 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,259 psi | 85% | 3264 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,870 psi | 89% | 3245 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,666 psi | 86% | 3123 fps | 99.8% |
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% | 44,440 psi | 68% | 2900 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 49,487 psi | 76% | 3107 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 80% | 46,731 psi | 72% | 3038 fps | 96.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,081 psi | 76% | 3051 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 44,208 psi | 68% | 2979 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 84% | 37,695 psi | 58% | 2818 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 96% | 50,473 psi | 78% | 3192 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 32,242 psi | 50% | 2703 fps | 96.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,718 psi | 75% | 3041 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,904 psi | 69% | 2982 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,497 psi | 67% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,855 psi | 58% | 2844 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,835 psi | 77% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,327 psi | 74% | 3097 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 51,822 psi | 80% | 3156 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,689 psi | 75% | 3022 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,698 psi | 64% | 2910 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 37,826 psi | 58% | 2831 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 44,904 psi | 69% | 2982 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 35,636 psi | 55% | 2766 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 46,818 psi | 72% | 2986 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,905 psi | 71% | 2969 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,736 psi | 81% | 3035 fps | 100% |
| Hodgdon Retumbo | 69.5 gr | 80% | 36,869 psi | 57% | 2877 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,621 psi | 84% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,587 psi | 73% | 2976 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 43,062 psi | 66% | 2963 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,305 psi | 60% | 2881 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,189 psi | 59% | 2762 fps | 98.8% |
| Norma 217 | <<locked>> | 86% | 34,476 psi | 53% | 2766 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 47,993 psi | 74% | 3064 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 43,352 psi | 67% | 2976 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 80% | 38,899 psi | 60% | 2831 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | 74.4 gr | 80% | 36,303 psi | 56% | 2851 fps | 97.8% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,061 psi | 65% | 2949 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,661 psi | 76% | 3025 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 48,385 psi | 74% | 3031 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,037 psi | 74% | 3025 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 50,778 psi | 78% | 3012 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 54,795 psi | 84% | 3097 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,747 psi | 75% | 3002 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 42,540 psi | 65% | 2864 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,153 psi | 74% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,601 psi | 73% | 3061 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 80% | 39,262 psi | 60% | 2844 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 86% | 43,192 psi | 66% | 2972 fps | 95.1% |
| Vihtavuori N570 | 83 gr | 92% | 51,343 psi | 79% | 3182 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,424 psi | 65% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,005 psi | 69% | 2927 fps | 98.5% |
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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Barnes TSX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,323 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.264" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Barnes TSX 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.