Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Sako Powerhead Blade 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, 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% | 56,710 psi | 87% | 3120 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,072 psi | 86% | 3228 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 86% | 58,421 psi | 90% | 3222 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,840 psi | 87% | 3232 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 55,796 psi | 86% | 3205 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,449 psi | 87% | 3317 fps | 97.4% |
| ADI AR 2225 | <<locked>> | 98% | 54,708 psi | 84% | 3222 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,407 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,928 psi | 89% | 3209 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,130 psi | 88% | 3222 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,172 psi | 85% | 3130 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,782 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,985 psi | 86% | 3215 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,175 psi | 90% | 3294 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,479 psi | 88% | 3186 fps | 97.7% |
| Bofors RP15 | <<locked>> | 90% | 56,550 psi | 87% | 3212 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 55,506 psi | 85% | 3212 fps | 99.5% |
| Bofors RP5 | <<locked>> | 88% | 57,130 psi | 88% | 3222 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 57,203 psi | 88% | 3228 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 55,796 psi | 86% | 3159 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,581 psi | 90% | 3209 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,479 psi | 90% | 3127 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,868 psi | 84% | 3287 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 58% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,608 psi | 87% | 3136 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,188 psi | 88% | 3136 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,260 psi | 87% | 3143 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 55,361 psi | 85% | 3212 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,577 psi | 82% | 3189 fps | 99.3% |
| Lovex S071 | <<locked>> | 94% | 58,581 psi | 90% | 3150 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,015 psi | 89% | 3196 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 54,621 psi | 84% | 3215 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,406 psi | 88% | 3241 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,521 psi | 87% | 3235 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 58,001 psi | 89% | 3192 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,969 psi | 85% | 3156 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 59% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,956 psi | 86% | 3278 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,158 psi | 85% | 3232 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 86% | 58,653 psi | 90% | 3186 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 57,522 psi | 89% | 3199 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,159 psi | 88% | 3192 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,507 psi | 87% | 3117 fps | 99% |
| Somchem S365 | <<locked>> | 82% | 56,695 psi | 87% | 3130 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,711 psi | 89% | 3163 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,885 psi | 89% | 3150 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,797 psi | 87% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,840 psi | 87% | 3245 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 92% | 57,740 psi | 89% | 3232 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 55,506 psi | 85% | 3235 fps | 98.3% |
| Vihtavuori N570 | <<locked>> | 96% | 56,826 psi | 87% | 3297 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,317 psi | 85% | 3215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,841 psi | 89% | 3163 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% | 43,004 psi | 66% | 2874 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 45,136 psi | 69% | 3005 fps | 96.1% |
| ADI AR 2209 | <<locked>> | 80% | 47,587 psi | 73% | 3025 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 42,801 psi | 66% | 2949 fps | 96.6% |
| ADI AR 2217 | <<locked>> | 86% | 39,073 psi | 60% | 2861 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 98% | 52,243 psi | 80% | 3235 fps | 96.3% |
| ADI AR 2225 | <<locked>> | 82% | 30,995 psi | 48% | 2671 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,723 psi | 84% | 3153 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,311 psi | 73% | 3015 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,468 psi | 67% | 2956 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,134 psi | 65% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,419 psi | 56% | 2818 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,037 psi | 74% | 3077 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,893 psi | 77% | 3136 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,123 psi | 73% | 2989 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 40,277 psi | 62% | 2881 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 39,059 psi | 60% | 2867 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,468 psi | 67% | 2956 fps | 98% |
| Hodgdon H1000 | <<locked>> | 82% | 37,028 psi | 57% | 2808 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,310 psi | 70% | 2956 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,570 psi | 69% | 2940 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,097 psi | 79% | 3012 fps | 100% |
| Hodgdon Retumbo | 67.5 gr | 80% | 35,491 psi | 55% | 2844 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,200 psi | 82% | 3077 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,664 psi | 83% | 3077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,325 psi | 71% | 2949 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,394 psi | 64% | 2927 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,666 psi | 58% | 2844 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 36,941 psi | 57% | 2733 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 54,201 psi | 83% | 3130 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 32,938 psi | 51% | 2733 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 46,108 psi | 71% | 3031 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 41,611 psi | 64% | 2940 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 54,230 psi | 83% | 3130 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,231 psi | 57% | 2799 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,737 psi | 53% | 2812 fps | 97% |
| ReloadSwiss RS 80 | 80.1 gr | 88% | 43,540 psi | 67% | 2992 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 48,269 psi | 74% | 2999 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 46,891 psi | 72% | 3002 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,557 psi | 72% | 2999 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 49,240 psi | 76% | 2986 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 53,098 psi | 82% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,340 psi | 73% | 2979 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,234 psi | 63% | 2838 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 46,543 psi | 72% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,788 psi | 70% | 3025 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 40,698 psi | 63% | 2884 fps | 95.6% |
| Vihtavuori N568 | 77.4 gr | 88% | 44,483 psi | 68% | 3012 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 94% | 52,866 psi | 81% | 3222 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,466 psi | 62% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,700 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 53 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Sako Powerhead Blade. ADI AR 2218 delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,317 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 1:8.5 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 | Sako Powerhead Blade 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.