Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 122gr | SUS-TAC HP bullet and 50 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>> | 86% | 55,637 psi | 86% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 58,682 psi | 90% | 3251 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 56,550 psi | 87% | 3169 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 55,259 psi | 85% | 3179 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 58,349 psi | 90% | 3225 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,940 psi | 85% | 3268 fps | 97.3% |
| ADI AR 2225 | <<locked>> | 98% | 57,479 psi | 88% | 3245 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,782 psi | 87% | 3163 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,188 psi | 86% | 3156 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,825 psi | 86% | 3176 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,754 psi | 89% | 3143 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 58,479 psi | 90% | 3222 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,491 psi | 84% | 3166 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,942 psi | 88% | 3251 fps | 97.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3235 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,883 psi | 86% | 3136 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 55,230 psi | 85% | 3166 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 58,262 psi | 90% | 3235 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,825 psi | 86% | 3176 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 55,912 psi | 86% | 3182 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 58,059 psi | 89% | 3176 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,942 psi | 88% | 3156 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,942 psi | 88% | 3077 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,725 psi | 89% | 3310 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 58% | 2057 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,726 psi | 90% | 3143 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,088 psi | 89% | 3150 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 57,609 psi | 89% | 3228 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,376 psi | 87% | 3219 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 57,624 psi | 89% | 3110 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,899 psi | 89% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,941 psi | 86% | 3192 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,158 psi | 85% | 3189 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 90% | 57,696 psi | 89% | 3176 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 60% | 2103 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,578 psi | 84% | 3228 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 58,073 psi | 89% | 3258 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 56,985 psi | 88% | 3136 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 56,101 psi | 86% | 3150 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,724 psi | 86% | 3146 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 58,639 psi | 90% | 3130 fps | 99.4% |
| Somchem S385 | <<locked>> | 84% | 56,391 psi | 87% | 3117 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,420 psi | 87% | 3104 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 55,738 psi | 86% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,332 psi | 85% | 3189 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 90% | 56,608 psi | 87% | 3189 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 58,494 psi | 90% | 3264 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 55,651 psi | 86% | 3251 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 58,494 psi | 90% | 3235 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,289 psi | 87% | 3114 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% | 45,571 psi | 70% | 2904 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 47,398 psi | 73% | 3035 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 49,530 psi | 76% | 3041 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 44,788 psi | 69% | 2972 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 38,392 psi | 59% | 2822 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 50,981 psi | 78% | 3186 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 30,719 psi | 47% | 2644 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,937 psi | 77% | 3041 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,472 psi | 76% | 3035 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,600 psi | 70% | 2982 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,353 psi | 68% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,508 psi | 59% | 2844 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,604 psi | 78% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,878 psi | 75% | 3097 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 52,576 psi | 81% | 3156 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,803 psi | 70% | 2940 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 42,366 psi | 65% | 2907 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 38,522 psi | 59% | 2831 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 45,600 psi | 70% | 2982 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 36,318 psi | 56% | 2769 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,239 psi | 73% | 2976 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,485 psi | 72% | 2959 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,243 psi | 82% | 3022 fps | 100% |
| Hodgdon Retumbo | 68 gr | 80% | 37,579 psi | 58% | 2884 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 44% | 1844 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,085 psi | 85% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,066 psi | 74% | 2966 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 43,468 psi | 67% | 2953 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,391 psi | 58% | 2815 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 39,233 psi | 60% | 2766 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 32,938 psi | 51% | 2713 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 48,602 psi | 75% | 3058 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 43,918 psi | 68% | 2972 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 80% | 39,610 psi | 61% | 2831 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 45% | 1886 fps | 100% |
| ReloadSwiss RS 76 | 72.8 gr | 80% | 37,072 psi | 57% | 2854 fps | 98.2% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,902 psi | 66% | 2956 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 50,140 psi | 77% | 3015 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 48,994 psi | 75% | 3022 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,660 psi | 75% | 3015 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 51,314 psi | 79% | 3002 fps | 98.4% |
| Somchem S385 | <<locked>> | 80% | 49,487 psi | 76% | 2995 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 43,381 psi | 67% | 2861 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 48,965 psi | 75% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,138 psi | 74% | 3054 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 40,161 psi | 62% | 2851 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 43,874 psi | 68% | 2972 fps | 95.5% |
| Vihtavuori N570 | 81.2 gr | 92% | 51,895 psi | 80% | 3179 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,308 psi | 67% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,716 psi | 70% | 2920 fps | 98.7% |
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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 122gr | SUS-TAC HP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 2,057 fps to 3,310 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 50 of the 50 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 122.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 122gr | SUS-TAC HP 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.