Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Barnes TTSX BT bullet and 55 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% | 57,174 psi | 88% | 3130 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,405 psi | 85% | 3228 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 56,304 psi | 87% | 3232 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 58,653 psi | 90% | 3225 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,305 psi | 88% | 3238 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,014 psi | 86% | 3212 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,855 psi | 88% | 3323 fps | 97.5% |
| ADI AR 2225 | <<locked>> | 98% | 54,940 psi | 85% | 3228 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,697 psi | 90% | 3212 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,160 psi | 90% | 3212 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,595 psi | 89% | 3232 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,448 psi | 85% | 3133 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,028 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,246 psi | 87% | 3219 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,624 psi | 90% | 3304 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,856 psi | 89% | 3192 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 56,768 psi | 87% | 3215 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 55,738 psi | 86% | 3215 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 57,595 psi | 89% | 3232 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 57,696 psi | 89% | 3238 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,014 psi | 86% | 3163 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,143 psi | 85% | 3150 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,755 psi | 90% | 3130 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,100 psi | 85% | 3291 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 58% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,840 psi | 87% | 3140 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,450 psi | 88% | 3140 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,463 psi | 87% | 3143 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 55,593 psi | 86% | 3219 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,766 psi | 83% | 3192 fps | 99.3% |
| Lovex S071 | <<locked>> | 92% | 55,100 psi | 85% | 3097 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,247 psi | 90% | 3202 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,653 psi | 89% | 3245 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,797 psi | 87% | 3241 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 58,233 psi | 90% | 3196 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 55,172 psi | 85% | 3159 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 59% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,188 psi | 86% | 3281 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,361 psi | 85% | 3232 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 84% | 55,303 psi | 85% | 3130 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 57,783 psi | 89% | 3202 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,392 psi | 88% | 3196 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,724 psi | 87% | 3120 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 56,985 psi | 88% | 3133 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,175 psi | 90% | 3173 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,102 psi | 89% | 3153 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,319 psi | 88% | 3166 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 86% | 57,058 psi | 88% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,087 psi | 88% | 3248 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 92% | 57,972 psi | 89% | 3235 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 55,941 psi | 86% | 3241 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 96% | 57,290 psi | 88% | 3304 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,840 psi | 86% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,059 psi | 89% | 3166 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% | 43,250 psi | 67% | 2877 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 47,819 psi | 74% | 3077 fps | 98% |
| Accurate MAGPRO | <<locked>> | 80% | 45,382 psi | 70% | 3012 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 47,616 psi | 73% | 3025 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 42,844 psi | 66% | 2953 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 39,262 psi | 60% | 2864 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 48,733 psi | 75% | 3156 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 82% | 31,169 psi | 48% | 2674 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,984 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,543 psi | 73% | 3015 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,497 psi | 67% | 2959 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,192 psi | 65% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,492 psi | 56% | 2818 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,283 psi | 74% | 3081 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 50,096 psi | 77% | 3140 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,311 psi | 73% | 2995 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 40,524 psi | 62% | 2887 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 39,276 psi | 60% | 2871 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 43,497 psi | 67% | 2959 fps | 98% |
| Hodgdon H1000 | <<locked>> | 82% | 37,217 psi | 57% | 2815 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 45,527 psi | 70% | 2959 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,585 psi | 69% | 2940 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,372 psi | 79% | 3015 fps | 100% |
| Hodgdon Retumbo | 67.8 gr | 80% | 35,708 psi | 55% | 2851 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 43% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,229 psi | 82% | 3077 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,925 psi | 83% | 3084 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,340 psi | 71% | 2949 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,611 psi | 64% | 2930 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,884 psi | 58% | 2851 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 37,028 psi | 57% | 2736 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 54,447 psi | 84% | 3133 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 33,156 psi | 51% | 2740 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 46,354 psi | 71% | 3035 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 41,858 psi | 64% | 2946 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 54,476 psi | 84% | 3133 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,449 psi | 58% | 2802 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 45% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,969 psi | 54% | 2818 fps | 97.1% |
| ReloadSwiss RS 80 | 80.4 gr | 88% | 43,772 psi | 67% | 2999 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 48,501 psi | 75% | 3005 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 47,137 psi | 73% | 3009 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,804 psi | 72% | 3002 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 49,429 psi | 76% | 2989 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 53,156 psi | 82% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,384 psi | 73% | 2979 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,452 psi | 64% | 2841 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 92% | 53,592 psi | 82% | 3100 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 46,789 psi | 72% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,021 psi | 71% | 3028 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 40,901 psi | 63% | 2890 fps | 95.7% |
| Vihtavuori N568 | 77.8 gr | 88% | 44,875 psi | 69% | 3018 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 94% | 53,098 psi | 82% | 3225 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,712 psi | 63% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,758 psi | 67% | 2900 fps | 98.1% |
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 55 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Barnes TTSX 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 55 of the 55 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 TTSX 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.