Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Barnes TAC-X bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and Alliant Reloder-33.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 57,696 psi | 89% | 3136 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,970 psi | 86% | 3235 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 86% | 57,058 psi | 88% | 3245 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 84% | 55,303 psi | 85% | 3173 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 57,841 psi | 89% | 3248 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,768 psi | 87% | 3222 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,696 psi | 89% | 3343 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 98% | 55,927 psi | 86% | 3241 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,697 psi | 90% | 3219 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,160 psi | 90% | 3238 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,260 psi | 87% | 3143 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,826 psi | 87% | 3219 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,840 psi | 87% | 3225 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,969 psi | 85% | 3235 fps | 96.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,534 psi | 84% | 3212 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,465 psi | 90% | 3205 fps | 97.9% |
| Bofors RP15 | <<locked>> | 90% | 57,537 psi | 89% | 3228 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 56,507 psi | 87% | 3228 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 58,160 psi | 90% | 3238 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 58,479 psi | 90% | 3248 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,768 psi | 87% | 3176 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,637 psi | 86% | 3156 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,448 psi | 85% | 3081 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,985 psi | 86% | 3304 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,695 psi | 58% | 2077 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,392 psi | 88% | 3146 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,030 psi | 89% | 3146 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,942 psi | 88% | 3156 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 88% | 56,159 psi | 86% | 3225 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,737 psi | 84% | 3209 fps | 99.4% |
| Lovex S071 | <<locked>> | 92% | 55,666 psi | 86% | 3104 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 3235 fps | 100% |
| Norma MRP | <<locked>> | 86% | 58,479 psi | 90% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,624 psi | 89% | 3255 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 55,927 psi | 86% | 3173 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 59% | 2119 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,000 psi | 88% | 3291 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,304 psi | 87% | 3245 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 84% | 55,840 psi | 86% | 3140 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 58,349 psi | 90% | 3209 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,957 psi | 89% | 3209 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,145 psi | 88% | 3127 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 57,624 psi | 89% | 3140 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,697 psi | 90% | 3179 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,042 psi | 85% | 3104 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 94% | 58,160 psi | 90% | 3182 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 86% | 57,914 psi | 89% | 3173 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,841 psi | 89% | 3258 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 92% | 58,711 psi | 90% | 3245 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,681 psi | 87% | 3251 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 96% | 58,015 psi | 89% | 3314 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,536 psi | 87% | 3228 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,798 psi | 90% | 3176 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% | 43,772 psi | 67% | 2887 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 48,385 psi | 74% | 3087 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 45,905 psi | 71% | 3022 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 48,182 psi | 74% | 3038 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 43,395 psi | 67% | 2966 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 84% | 36,970 psi | 57% | 2805 fps | 95% |
| ADI AR 2218 | <<locked>> | 96% | 49,313 psi | 76% | 3166 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 31,589 psi | 49% | 2687 fps | 95.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,109 psi | 74% | 3028 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,063 psi | 68% | 2966 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,801 psi | 66% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,028 psi | 57% | 2828 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,907 psi | 75% | 3091 fps | 100% |
| Alliant Reloder-33 | 86.8 gr | 94% | 50,966 psi | 78% | 3159 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,502 psi | 78% | 3133 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,892 psi | 74% | 3005 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 40,886 psi | 63% | 2894 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 37,028 psi | 57% | 2812 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 44,063 psi | 68% | 2966 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 82% | 37,695 psi | 58% | 2825 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 46,021 psi | 71% | 2969 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,107 psi | 69% | 2949 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,982 psi | 80% | 3025 fps | 100% |
| Hodgdon Retumbo | 68.5 gr | 80% | 36,230 psi | 56% | 2864 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,766 psi | 83% | 3087 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 54,288 psi | 84% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,833 psi | 72% | 2963 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 42,192 psi | 65% | 2943 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 38,392 psi | 59% | 2861 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 37,536 psi | 58% | 2746 fps | 98.6% |
| Norma 217 | <<locked>> | 86% | 33,678 psi | 52% | 2749 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 46,920 psi | 72% | 3048 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 42,279 psi | 65% | 2953 fps | 97% |
| Ramshot Magnum | <<locked>> | 80% | 38,116 psi | 59% | 2815 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1903 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,563 psi | 55% | 2835 fps | 97.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 44,440 psi | 68% | 3012 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 48,820 psi | 75% | 3012 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 47,703 psi | 73% | 3018 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,369 psi | 73% | 3012 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 49,908 psi | 77% | 2995 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 53,795 psi | 83% | 3084 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,921 psi | 74% | 2989 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 41,945 psi | 65% | 2854 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 92% | 54,201 psi | 83% | 3110 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 47,224 psi | 73% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,557 psi | 72% | 3041 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 82% | 41,408 psi | 64% | 2900 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 45,542 psi | 70% | 3028 fps | 95.8% |
| Vihtavuori N570 | 81.7 gr | 92% | 50,125 psi | 77% | 3163 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,423 psi | 64% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,237 psi | 68% | 2910 fps | 98.3% |
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 53 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Barnes TAC-X. ADI AR 2218 delivers the highest muzzle velocity at 3,343 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,343 fps. ADI AR 2218 gives the best case fill at 100 %, and 53 of the 53 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 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, Alliant Reloder-50, 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Barnes TAC-X 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.