Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 115gr | Barnes TAC-TX BT bullet and 59 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% | 55,637 psi | 86% | 3159 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,653 psi | 89% | 3320 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 54,882 psi | 84% | 3258 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 86% | 57,203 psi | 88% | 3258 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 55,709 psi | 86% | 3264 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 58,378 psi | 90% | 3301 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 3333 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,261 psi | 88% | 3320 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,261 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,753 psi | 87% | 3241 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,043 psi | 86% | 3258 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,740 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,262 psi | 90% | 3301 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 58,726 psi | 90% | 3317 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,724 psi | 87% | 3317 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,463 psi | 87% | 3219 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 55,245 psi | 85% | 3241 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 57,928 psi | 89% | 3304 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 56,043 psi | 86% | 3258 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 55,869 psi | 86% | 3261 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 58,740 psi | 90% | 3261 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,566 psi | 89% | 3241 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,334 psi | 88% | 3166 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,508 psi | 89% | 3389 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 58% | 2110 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,622 psi | 86% | 3173 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 56,086 psi | 86% | 3173 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,216 psi | 85% | 3173 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 57,986 psi | 89% | 3314 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,185 psi | 80% | 3219 fps | 98.8% |
| Lovex S070 | <<locked>> | 82% | 57,653 psi | 89% | 3202 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,261 psi | 88% | 3186 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,869 psi | 88% | 3232 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 53,098 psi | 82% | 3241 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 55,985 psi | 86% | 3274 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,754 psi | 89% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,216 psi | 85% | 3264 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,840 psi | 87% | 3228 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,986 psi | 89% | 3258 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 59% | 2162 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 58,798 psi | 90% | 3379 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,914 psi | 89% | 3327 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 86% | 57,566 psi | 89% | 3225 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 56,318 psi | 87% | 3232 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 82% | 57,653 psi | 89% | 3202 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 58,131 psi | 89% | 3156 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,927 psi | 86% | 3228 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 55,390 psi | 85% | 3146 fps | 98.6% |
| Somchem S365 | <<locked>> | 82% | 55,521 psi | 85% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,739 psi | 87% | 3199 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,826 psi | 87% | 3189 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 58,639 psi | 90% | 3219 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,550 psi | 85% | 3196 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,492 psi | 85% | 3271 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 92% | 56,478 psi | 87% | 3261 fps | 99% |
| Vihtavuori N568 | <<locked>> | 96% | 58,291 psi | 90% | 3333 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 96% | 55,535 psi | 85% | 3323 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,986 psi | 89% | 3314 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,797 psi | 87% | 3196 fps | 99.7% |
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% | 42,061 psi | 65% | 2900 fps | 99.2% |
| Accurate High Country | <<locked>> | 80% | 46,441 psi | 71% | 3100 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 80% | 44,048 psi | 68% | 3031 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 46,441 psi | 71% | 3051 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 41,655 psi | 64% | 2972 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 40,944 psi | 63% | 2953 fps | 96.1% |
| ADI AR 2218 | <<locked>> | 98% | 50,865 psi | 78% | 3248 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 32,430 psi | 50% | 2756 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,417 psi | 82% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,398 psi | 71% | 3045 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,308 psi | 65% | 2979 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,988 psi | 63% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,360 psi | 54% | 2831 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,731 psi | 72% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 52,344 psi | 81% | 3235 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,371 psi | 76% | 3084 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 39,392 psi | 61% | 2907 fps | 96.2% |
| Bofors RP30 | <<locked>> | 86% | 40,843 psi | 63% | 2959 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 42,308 psi | 65% | 2979 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 84% | 38,856 psi | 60% | 2900 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 44,396 psi | 68% | 2986 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,468 psi | 67% | 2966 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,169 psi | 77% | 3051 fps | 100% |
| Hodgdon Retumbo | 68.1 gr | 80% | 34,606 psi | 53% | 2864 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 43% | 1890 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,112 psi | 80% | 3110 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 52,634 psi | 81% | 3117 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,339 psi | 70% | 2979 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 40,408 psi | 62% | 2949 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,320 psi | 61% | 2933 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 54,186 psi | 83% | 3146 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,998 psi | 55% | 2756 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 53,171 psi | 82% | 3163 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 34,272 psi | 53% | 2818 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 44,991 psi | 69% | 3058 fps | 99% |
| Norma URP | <<locked>> | 80% | 54,186 psi | 83% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,350 psi | 62% | 2959 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 53,171 psi | 82% | 3163 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,201 psi | 56% | 2815 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 44% | 1939 fps | 100% |
| ReloadSwiss RS 76 | 72.8 gr | 80% | 33,794 psi | 52% | 2825 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 45,745 psi | 70% | 3091 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,224 psi | 73% | 3028 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 45,919 psi | 71% | 3035 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 80% | 54,186 psi | 83% | 3146 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,389 psi | 84% | 3097 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,585 psi | 70% | 3028 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 48,327 psi | 74% | 3015 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 51,779 psi | 80% | 3107 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,209 psi | 71% | 3005 fps | 99% |
| Vihtavuori N165 | <<locked>> | 80% | 40,350 psi | 62% | 2867 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 54,926 psi | 85% | 3159 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,527 psi | 70% | 3015 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,715 psi | 69% | 3051 fps | 96.2% |
| Vihtavuori N565 | <<locked>> | 84% | 42,554 psi | 65% | 2976 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 90% | 46,760 psi | 72% | 3107 fps | 95.7% |
| Vihtavuori N570 | 83 gr | 94% | 51,459 psi | 79% | 3241 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,160 psi | 60% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,583 psi | 66% | 2923 fps | 97.5% |
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 59 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 115gr | Barnes TAC-TX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,389 fps; across all powders the maximum-charge window runs from 2,110 fps to 3,389 fps. ADI AR 2218 gives the best case fill at 100 %, and 59 of the 59 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 115.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 115gr | 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.