Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Barnes TAC-TX BT bullet and 56 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 80 and Vihtavuori N568.
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% | 57,203 psi | 88% | 3127 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,448 psi | 85% | 3225 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 56,550 psi | 87% | 3235 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 58,711 psi | 90% | 3228 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,334 psi | 88% | 3238 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,260 psi | 87% | 3215 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,826 psi | 87% | 3323 fps | 97.5% |
| ADI AR 2225 | <<locked>> | 98% | 55,201 psi | 85% | 3232 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,013 psi | 85% | 3156 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,740 psi | 90% | 3212 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,189 psi | 90% | 3212 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,624 psi | 89% | 3232 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,709 psi | 86% | 3136 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,072 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,304 psi | 87% | 3222 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,595 psi | 90% | 3301 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,856 psi | 89% | 3196 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 56,797 psi | 87% | 3215 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 55,767 psi | 86% | 3215 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 57,624 psi | 89% | 3232 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 57,711 psi | 89% | 3235 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,289 psi | 87% | 3169 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,143 psi | 85% | 3146 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,784 psi | 90% | 3130 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,419 psi | 85% | 3297 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 58% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,884 psi | 88% | 3140 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,725 psi | 89% | 3143 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,507 psi | 87% | 3143 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 55,622 psi | 86% | 3219 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,056 psi | 83% | 3199 fps | 99.4% |
| Lovex S071 | <<locked>> | 92% | 55,158 psi | 85% | 3097 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,494 psi | 90% | 3205 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 55,114 psi | 85% | 3225 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,914 psi | 89% | 3248 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,072 psi | 88% | 3245 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 58,494 psi | 90% | 3199 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 55,448 psi | 85% | 3163 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 59% | 2119 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,478 psi | 87% | 3281 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,622 psi | 86% | 3235 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 84% | 55,332 psi | 85% | 3130 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 57,812 psi | 89% | 3202 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,406 psi | 88% | 3199 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,724 psi | 87% | 3120 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 57,058 psi | 88% | 3133 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,204 psi | 90% | 3169 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,334 psi | 90% | 3156 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,537 psi | 89% | 3173 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 57,334 psi | 88% | 3166 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,348 psi | 88% | 3251 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 92% | 58,233 psi | 90% | 3238 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 55,999 psi | 86% | 3241 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 96% | 57,551 psi | 89% | 3307 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,898 psi | 86% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,305 psi | 90% | 3169 fps | 99.9% |
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% | 43,279 psi | 67% | 2877 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 48,066 psi | 74% | 3081 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 45,397 psi | 70% | 3015 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 47,863 psi | 74% | 3028 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 43,062 psi | 66% | 2956 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 39,305 psi | 60% | 2864 fps | 96% |
| ADI AR 2218 | <<locked>> | 96% | 48,762 psi | 75% | 3153 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 82% | 31,212 psi | 48% | 2677 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,037 psi | 74% | 3025 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,071 psi | 85% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,587 psi | 73% | 3018 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,729 psi | 67% | 2963 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,438 psi | 65% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,695 psi | 56% | 2822 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,341 psi | 74% | 3081 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 50,328 psi | 77% | 3146 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,500 psi | 73% | 2999 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 40,567 psi | 62% | 2887 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 39,320 psi | 61% | 2871 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 43,729 psi | 67% | 2963 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 37,260 psi | 57% | 2815 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 45,556 psi | 70% | 2959 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,817 psi | 69% | 2946 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,430 psi | 79% | 3015 fps | 100% |
| Hodgdon Retumbo | 67.9 gr | 80% | 35,781 psi | 55% | 2851 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,282 psi | 44% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,476 psi | 82% | 3081 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,969 psi | 83% | 3084 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,572 psi | 72% | 2956 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 41,684 psi | 64% | 2933 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,942 psi | 58% | 2854 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 37,231 psi | 57% | 2740 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 54,476 psi | 84% | 3133 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 33,199 psi | 51% | 2740 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 46,601 psi | 72% | 3041 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 41,930 psi | 65% | 2949 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 54,549 psi | 84% | 3133 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,666 psi | 58% | 2805 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,128 psi | 54% | 2822 fps | 97.2% |
| ReloadSwiss RS 80 | 80.6 gr | 88% | 43,990 psi | 68% | 3002 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 48,544 psi | 75% | 3005 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 47,181 psi | 73% | 3009 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,847 psi | 72% | 3002 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 49,487 psi | 76% | 2989 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 53,432 psi | 82% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,630 psi | 73% | 2982 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,495 psi | 64% | 2841 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 92% | 53,606 psi | 83% | 3100 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 46,862 psi | 72% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,253 psi | 71% | 3035 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 40,944 psi | 63% | 2890 fps | 95.7% |
| Vihtavuori N568 | 77.9 gr | 88% | 44,904 psi | 69% | 3018 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 94% | 53,345 psi | 82% | 3228 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,814 psi | 63% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,947 psi | 68% | 2904 fps | 98.2% |
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 56 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Barnes TAC-TX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,323 fps. ADI AR 2218 gives the best case fill at 100 %, and 56 of the 56 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 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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. Hodgdon Retumbo, ReloadSwiss RS 80, Vihtavuori N568 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Barnes TAC-TX 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.