Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 100gr | Barnes TAC-TX BT bullet and 68 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 76 and Norma MRP.
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>> | 90% | 55,100 psi | 85% | 3320 fps | 99.9% |
| Accurate 4350 | <<locked>> | 82% | 55,419 psi | 85% | 3363 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,971 psi | 88% | 3484 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 90% | 58,392 psi | 90% | 3491 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 88% | 56,768 psi | 87% | 3425 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 90% | 55,071 psi | 85% | 3425 fps | 98% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,696 psi | 89% | 3458 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,098 psi | 80% | 3402 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,724 psi | 87% | 3432 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,289 psi | 87% | 3409 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,332 psi | 85% | 3419 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,014 psi | 88% | 3399 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,188 psi | 88% | 3465 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,841 psi | 89% | 3488 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 58,320 psi | 90% | 3471 fps | 99.3% |
| Bofors RP30 | <<locked>> | 98% | 57,014 psi | 88% | 3461 fps | 98.8% |
| Bofors RP5 | <<locked>> | 90% | 55,332 psi | 85% | 3419 fps | 99% |
| Bofors RP7 | <<locked>> | 82% | 57,000 psi | 88% | 3366 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 96% | 55,245 psi | 85% | 3415 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,087 psi | 88% | 3419 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 58,378 psi | 90% | 3428 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,217 psi | 88% | 3406 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,884 psi | 88% | 3346 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,072 psi | 86% | 3543 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 82% | 58,494 psi | 90% | 3458 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,260 psi | 57% | 2251 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,593 psi | 86% | 3346 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,349 psi | 90% | 3392 fps | 99.8% |
| IMR 4831 | <<locked>> | 84% | 55,825 psi | 86% | 3350 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,711 psi | 90% | 3406 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 92% | 57,130 psi | 88% | 3471 fps | 98.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,195 psi | 73% | 3278 fps | 96.5% |
| Lovex S065 | <<locked>> | 82% | 55,564 psi | 86% | 3330 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,624 psi | 89% | 3383 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 56,434 psi | 87% | 3346 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,014 psi | 88% | 3409 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 47,935 psi | 74% | 3307 fps | 98.7% |
| Norma MRP | <<locked>> | 88% | 55,288 psi | 85% | 3435 fps | 99.7% |
| Norma URP | <<locked>> | 84% | 57,551 psi | 89% | 3406 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,682 psi | 90% | 3504 fps | 99% |
| Ramshot Hunter | <<locked>> | 84% | 56,797 psi | 87% | 3409 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,101 psi | 88% | 3415 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 59% | 2297 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,709 psi | 86% | 3379 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,697 psi | 90% | 3478 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,363 psi | 88% | 3533 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,797 psi | 87% | 3474 fps | 97.6% |
| Rottweil R 904 | <<locked>> | 88% | 57,595 psi | 89% | 3396 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 88% | 55,985 psi | 86% | 3399 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 82% | 57,000 psi | 88% | 3366 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,564 psi | 86% | 3330 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,624 psi | 89% | 3383 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,363 psi | 90% | 3337 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,579 psi | 86% | 3396 fps | 99% |
| Somchem S361 | <<locked>> | 86% | 55,564 psi | 86% | 3314 fps | 97.6% |
| Somchem S365 | <<locked>> | 84% | 54,955 psi | 85% | 3346 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,391 psi | 87% | 3369 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 82% | 55,492 psi | 85% | 3337 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,347 psi | 87% | 3350 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 84% | 58,610 psi | 90% | 3399 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,595 psi | 90% | 3425 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,882 psi | 84% | 3428 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 94% | 55,535 psi | 85% | 3412 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 98% | 57,290 psi | 88% | 3481 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,129 psi | 85% | 3278 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,290 psi | 88% | 3422 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,550 psi | 87% | 3484 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,376 psi | 87% | 3360 fps | 99.1% |
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% | 38,551 psi | 59% | 2976 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 51,488 psi | 79% | 3287 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 45,759 psi | 70% | 3248 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 86% | 50,343 psi | 77% | 3330 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 43,033 psi | 66% | 3136 fps | 96.1% |
| ADI AR 2213 | <<locked>> | 84% | 44,396 psi | 68% | 3196 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 43,163 psi | 66% | 3153 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 36,492 psi | 56% | 3018 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,385 psi | 76% | 3297 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,888 psi | 66% | 3127 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 82% | 41,684 psi | 64% | 3123 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,405 psi | 58% | 3005 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,329 psi | 50% | 2890 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,250 psi | 65% | 3176 fps | 99.2% |
| Bofors RP15 | <<locked>> | 84% | 41,481 psi | 64% | 3117 fps | 95.5% |
| Bofors RP30 | <<locked>> | 90% | 42,873 psi | 66% | 3163 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 41,684 psi | 64% | 3123 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 53,388 psi | 82% | 3301 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 88% | 41,176 psi | 63% | 3107 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 53,200 psi | 82% | 3346 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 84% | 47,384 psi | 73% | 3209 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 46,412 psi | 71% | 3189 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,456 psi | 71% | 3159 fps | 100% |
| Hodgdon Retumbo | 74.6 gr | 86% | 39,015 psi | 60% | 3140 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 53,998 psi | 83% | 3379 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 43% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,805 psi | 75% | 3215 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,752 psi | 84% | 3330 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 48,820 psi | 75% | 3222 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 45,281 psi | 70% | 3136 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 45,934 psi | 71% | 3241 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 43,874 psi | 68% | 3199 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 52,083 psi | 80% | 3264 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 50,604 psi | 78% | 3255 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 32,982 psi | 51% | 2822 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 49,429 psi | 76% | 3261 fps | 97.7% |
| Norma 217 | <<locked>> | 94% | 38,377 psi | 59% | 3077 fps | 95.7% |
| Norma MRP | 72 gr | 80% | 41,075 psi | 63% | 3130 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 50,328 psi | 77% | 3274 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 42,859 psi | 66% | 3176 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 49,400 psi | 76% | 3268 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 38,464 psi | 59% | 3025 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,456 psi | 44% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,866 psi | 80% | 3310 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,459 psi | 78% | 3330 fps | 100% |
| ReloadSwiss RS 76 | 78 gr | 84% | 35,824 psi | 55% | 3028 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 48,472 psi | 75% | 3304 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,092 psi | 68% | 3117 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 42,308 psi | 65% | 3110 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 53,388 psi | 82% | 3301 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,083 psi | 80% | 3264 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 50,604 psi | 78% | 3255 fps | 99.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,140 psi | 79% | 3205 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,974 psi | 65% | 3104 fps | 95.9% |
| Somchem S361 | <<locked>> | 82% | 48,341 psi | 74% | 3173 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 47,790 psi | 74% | 3219 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,830 psi | 66% | 3091 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 80% | 51,706 psi | 80% | 3268 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 39,958 psi | 61% | 3009 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 51,068 psi | 79% | 3264 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,742 psi | 64% | 3100 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 47,485 psi | 73% | 3274 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 88% | 44,889 psi | 69% | 3186 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 94% | 49,342 psi | 76% | 3320 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,430 psi | 79% | 3219 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,417 psi | 82% | 3350 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,679 psi | 53% | 3022 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 42,380 psi | 65% | 3074 fps | 96.1% |
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 68 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 100gr | Barnes TAC-TX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,543 fps; across all powders the maximum-charge window runs from 2,251 fps to 3,543 fps. ADI AR 2217 gives the best case fill at 100 %, and 68 of the 68 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.264" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Hodgdon TrailBoss 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 76, Norma MRP rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 100gr | 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.