Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 131gr | Sellier & Bellot SP bullet and 51 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% | 55,680 psi | 86% | 2989 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,213 psi | 79% | 3005 fps | 96.5% |
| Accurate High Country | <<locked>> | 82% | 57,609 psi | 89% | 3146 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 58,653 psi | 90% | 3159 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 56,463 psi | 87% | 3074 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,376 psi | 85% | 3091 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 92% | 54,824 psi | 84% | 3074 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 96% | 55,477 psi | 85% | 3196 fps | 98.3% |
| ADI AR 2225 | <<locked>> | 96% | 58,407 psi | 90% | 3159 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 56,681 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,115 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,985 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,957 psi | 89% | 3048 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,042 psi | 85% | 3068 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,537 psi | 89% | 3173 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,841 psi | 89% | 3166 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,521 psi | 85% | 3048 fps | 98.2% |
| Bofors RP15 | <<locked>> | 86% | 55,448 psi | 85% | 3077 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,868 psi | 84% | 3084 fps | 99.8% |
| Bofors RP5 | <<locked>> | 84% | 55,985 psi | 86% | 3087 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,188 psi | 86% | 3094 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,667 psi | 89% | 3081 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,782 psi | 87% | 3064 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 58,755 psi | 90% | 3222 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 58% | 2001 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,740 psi | 89% | 3054 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 57,798 psi | 89% | 3136 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,363 psi | 88% | 3140 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 57,667 psi | 89% | 3018 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,955 psi | 85% | 3100 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,999 psi | 86% | 3097 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,317 psi | 85% | 3097 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 57,943 psi | 89% | 3087 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,088 psi | 60% | 2047 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,434 psi | 85% | 3143 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 58,653 psi | 90% | 3176 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 56,739 psi | 87% | 3045 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 55,883 psi | 86% | 3054 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 3018 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,521 psi | 85% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 58,160 psi | 90% | 3035 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 56,130 psi | 86% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,347 psi | 87% | 3012 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,782 psi | 86% | 3038 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 55,970 psi | 86% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,332 psi | 85% | 3097 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 88% | 56,913 psi | 88% | 3100 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 90% | 54,940 psi | 85% | 3110 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 92% | 56,492 psi | 87% | 3176 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,100 psi | 85% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,912 psi | 86% | 3018 fps | 100% |
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% | 48,791 psi | 75% | 2874 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 47,718 psi | 73% | 2940 fps | 95.5% |
| Accurate High Country | <<locked>> | 80% | 53,751 psi | 83% | 3081 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 80% | 51,053 psi | 79% | 3022 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 80% | 52,808 psi | 81% | 3012 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 48,109 psi | 74% | 2956 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 80% | 35,969 psi | 55% | 2680 fps | 95.8% |
| ADI AR 2218 | 84.1 gr | 92% | 47,688 psi | 73% | 3035 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 33,272 psi | 51% | 2648 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,127 psi | 82% | 3012 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,634 psi | 81% | 3002 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,863 psi | 75% | 2959 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,659 psi | 73% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,785 psi | 64% | 2828 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 45,934 psi | 71% | 2949 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 49,647 psi | 76% | 3012 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,643 psi | 70% | 2858 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 45,484 psi | 70% | 2887 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 39,117 psi | 60% | 2762 fps | 97% |
| Bofors RP5 | <<locked>> | 80% | 48,863 psi | 75% | 2959 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 39,146 psi | 60% | 2762 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 80% | 50,328 psi | 77% | 2953 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,530 psi | 76% | 2936 fps | 98.6% |
| Hodgdon Retumbo | 69 gr | 80% | 40,828 psi | 63% | 2884 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 44% | 1788 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,879 psi | 78% | 2936 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 47,021 psi | 72% | 2940 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 35,534 psi | 55% | 2687 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 41,974 psi | 65% | 2743 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 31,314 psi | 48% | 2585 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 52,199 psi | 80% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,601 psi | 73% | 2956 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 43,091 psi | 66% | 2825 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,399 psi | 45% | 1834 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,596 psi | 62% | 2858 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 40,248 psi | 62% | 2808 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 53,171 psi | 82% | 2982 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 52,301 psi | 80% | 2992 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 49,588 psi | 76% | 2949 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,953 psi | 80% | 2989 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 54,259 psi | 84% | 2969 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 52,634 psi | 81% | 2966 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,325 psi | 71% | 2838 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 52,141 psi | 80% | 2969 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 52,417 psi | 81% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,590 psi | 79% | 3031 fps | 99% |
| Vihtavuori N565 | <<locked>> | 80% | 43,265 psi | 67% | 2838 fps | 97.5% |
| Vihtavuori N568 | <<locked>> | 82% | 41,249 psi | 63% | 2828 fps | 95.5% |
| Vihtavuori N570 | 78.8 gr | 88% | 48,892 psi | 75% | 3028 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,529 psi | 73% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,776 psi | 75% | 2894 fps | 99.6% |
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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 131gr | Sellier & Bellot SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,222 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 131.0 gr projectile in 0.264" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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 | 131gr | Sellier & Bellot SP 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.