Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Barnes X S bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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>> | 84% | 56,289 psi | 87% | 3097 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 57,580 psi | 89% | 3255 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 58,349 psi | 90% | 3255 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 82% | 55,912 psi | 86% | 3169 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 86% | 58,465 psi | 90% | 3245 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 94% | 57,928 psi | 89% | 3232 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 96% | 54,621 psi | 84% | 3271 fps | 97.1% |
| ADI AR 2225 | <<locked>> | 96% | 57,508 psi | 89% | 3258 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,767 psi | 86% | 3159 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,724 psi | 86% | 3186 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,696 psi | 89% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 58,189 psi | 90% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,072 psi | 88% | 3264 fps | 97.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,754 psi | 89% | 3261 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 58,378 psi | 90% | 3196 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 58,769 psi | 90% | 3238 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 58,566 psi | 90% | 3251 fps | 99.8% |
| Bofors RP5 | <<locked>> | 84% | 55,724 psi | 86% | 3186 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 90% | 55,405 psi | 85% | 3189 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 84% | 57,421 psi | 88% | 3176 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,333 psi | 87% | 3156 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,696 psi | 89% | 3323 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,116 psi | 59% | 2080 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,305 psi | 88% | 3150 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 86% | 57,116 psi | 88% | 3232 fps | 99.6% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,043 psi | 88% | 3238 fps | 99.7% |
| Lovex S071 | <<locked>> | 90% | 58,407 psi | 90% | 3133 fps | 100% |
| Norma 217 | <<locked>> | 98% | 58,494 psi | 90% | 3268 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,014 psi | 86% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 58,784 psi | 90% | 3258 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 88% | 57,551 psi | 89% | 3186 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,262 psi | 60% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 58,798 psi | 90% | 3307 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 58,363 psi | 90% | 3274 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 82% | 56,362 psi | 87% | 3136 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 82% | 55,898 psi | 86% | 3156 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,521 psi | 85% | 3153 fps | 99.8% |
| Somchem S361 | <<locked>> | 82% | 57,914 psi | 89% | 3127 fps | 99.3% |
| Somchem S385 | <<locked>> | 82% | 56,405 psi | 87% | 3127 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,130 psi | 86% | 3110 fps | 100% |
| Vihtavuori N555 | <<locked>> | 82% | 56,260 psi | 87% | 3133 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 58,798 psi | 90% | 3264 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 88% | 56,985 psi | 88% | 3205 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 92% | 58,537 psi | 90% | 3274 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 92% | 56,043 psi | 86% | 3271 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,940 psi | 85% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,927 psi | 86% | 3120 fps | 99.8% |
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% | 49,661 psi | 76% | 2986 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 53,896 psi | 83% | 3186 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 80% | 51,126 psi | 79% | 3120 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 80% | 52,460 psi | 81% | 3107 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 47,848 psi | 74% | 3048 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 80% | 36,564 psi | 56% | 2779 fps | 95% |
| ADI AR 2218 | 85.6 gr | 94% | 50,937 psi | 78% | 3196 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,142 psi | 53% | 2756 fps | 97.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,431 psi | 81% | 3100 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,965 psi | 75% | 3061 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,863 psi | 74% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,945 psi | 65% | 2933 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 90% | 49,516 psi | 76% | 3120 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 50,256 psi | 77% | 3120 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 48,370 psi | 74% | 3005 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 45,876 psi | 71% | 2995 fps | 98.6% |
| Bofors RP30 | <<locked>> | 80% | 39,755 psi | 61% | 2871 fps | 96.4% |
| Bofors RP5 | <<locked>> | 80% | 48,965 psi | 75% | 3061 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 39,595 psi | 61% | 2861 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 80% | 50,343 psi | 77% | 3045 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,443 psi | 76% | 3028 fps | 98% |
| Hodgdon Retumbo | 68.8 gr | 80% | 41,147 psi | 63% | 2986 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,660 psi | 44% | 1860 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,705 psi | 78% | 3028 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 46,847 psi | 72% | 3035 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 86% | 38,740 psi | 60% | 2861 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 43,294 psi | 67% | 2861 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 32,430 psi | 50% | 2707 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 52,315 psi | 81% | 3136 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,572 psi | 73% | 3054 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 80% | 43,366 psi | 67% | 2927 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,588 psi | 46% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,843 psi | 63% | 2963 fps | 99.2% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 41,002 psi | 63% | 2923 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,953 psi | 81% | 3074 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 52,431 psi | 81% | 3097 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,069 psi | 80% | 3091 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 54,389 psi | 84% | 3064 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 52,866 psi | 81% | 3068 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 46,572 psi | 72% | 2936 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 53,098 psi | 82% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,576 psi | 79% | 3133 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 44,135 psi | 68% | 2949 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 44,599 psi | 69% | 2999 fps | 95.7% |
| Vihtavuori N570 | 80.3 gr | 90% | 52,301 psi | 80% | 3199 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,456 psi | 73% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,037 psi | 75% | 2995 fps | 99.2% |
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 47 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Barnes X S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,323 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.264" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Barnes X S 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.