Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 107gr | Sierra MatchKing bullet and 58 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 76 and Ramshot Grand.
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% | 55,434 psi | 85% | 3241 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,217 psi | 88% | 3402 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 88% | 58,407 psi | 90% | 3409 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 86% | 56,637 psi | 87% | 3337 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 88% | 54,955 psi | 85% | 3340 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 98% | 57,696 psi | 89% | 3379 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,420 psi | 87% | 3396 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,637 psi | 87% | 3337 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,246 psi | 87% | 3323 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,434 psi | 85% | 3337 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,363 psi | 88% | 3314 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,769 psi | 89% | 3386 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 58,392 psi | 90% | 3406 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,985 psi | 86% | 3294 fps | 96.4% |
| Bofors RP15 | <<locked>> | 92% | 58,610 psi | 90% | 3389 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 57,450 psi | 88% | 3386 fps | 99.3% |
| Bofors RP5 | <<locked>> | 88% | 55,434 psi | 85% | 3337 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 94% | 55,317 psi | 85% | 3337 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 88% | 58,044 psi | 89% | 3340 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,898 psi | 88% | 3320 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,826 psi | 87% | 3255 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,579 psi | 87% | 3465 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 58% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,332 psi | 85% | 3258 fps | 99.8% |
| IMR 4831 | <<locked>> | 82% | 55,927 psi | 86% | 3264 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 58,363 psi | 90% | 3317 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 57,334 psi | 88% | 3389 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,750 psi | 80% | 3291 fps | 98.3% |
| Lovex S070 | <<locked>> | 82% | 57,522 psi | 89% | 3294 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,188 psi | 88% | 3271 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,434 psi | 87% | 3310 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 52,837 psi | 81% | 3323 fps | 99.7% |
| Norma MRP | <<locked>> | 86% | 55,593 psi | 86% | 3356 fps | 99.9% |
| Norma URP | <<locked>> | 82% | 57,493 psi | 88% | 3310 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 58,639 psi | 90% | 3415 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,391 psi | 87% | 3314 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,392 psi | 88% | 3337 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 59% | 2234 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,639 psi | 90% | 3389 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 58,117 psi | 89% | 3458 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,348 psi | 88% | 3406 fps | 98.3% |
| Rottweil R 904 | <<locked>> | 86% | 57,087 psi | 88% | 3304 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 86% | 55,869 psi | 86% | 3314 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 82% | 57,522 psi | 89% | 3294 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,972 psi | 89% | 3245 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,477 psi | 85% | 3310 fps | 99.4% |
| Somchem S361 | <<locked>> | 84% | 55,114 psi | 85% | 3225 fps | 98.1% |
| Somchem S365 | <<locked>> | 82% | 55,259 psi | 85% | 3258 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,362 psi | 87% | 3281 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 90% | 56,246 psi | 87% | 3264 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 58,334 psi | 90% | 3307 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,347 psi | 85% | 3284 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,056 psi | 85% | 3353 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 92% | 56,014 psi | 86% | 3337 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 96% | 57,841 psi | 89% | 3412 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,682 psi | 90% | 3245 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,493 psi | 88% | 3402 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,405 psi | 87% | 3281 fps | 99.5% |
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% | 42,148 psi | 65% | 2982 fps | 98.8% |
| Accurate High Country | <<locked>> | 80% | 46,224 psi | 71% | 3176 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 47,079 psi | 72% | 3182 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 46,079 psi | 71% | 3127 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 80% | 41,510 psi | 64% | 3048 fps | 95% |
| ADI AR 2217 | <<locked>> | 88% | 40,683 psi | 63% | 3018 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 86% | 34,722 psi | 53% | 2897 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,953 psi | 81% | 3274 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,093 psi | 71% | 3123 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,221 psi | 65% | 3058 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,843 psi | 63% | 3005 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,244 psi | 54% | 2907 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,427 psi | 71% | 3186 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 52,286 psi | 80% | 3222 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 39,276 psi | 60% | 2979 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 40,698 psi | 63% | 3031 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 42,221 psi | 65% | 3058 fps | 96.7% |
| Hodgdon H1000 | <<locked>> | 84% | 38,682 psi | 60% | 2972 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 44,063 psi | 68% | 3058 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,337 psi | 67% | 3038 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,893 psi | 77% | 3136 fps | 100% |
| Hodgdon Retumbo | 71.1 gr | 82% | 36,970 psi | 57% | 3009 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 43% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,706 psi | 80% | 3189 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 52,388 psi | 81% | 3202 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,063 psi | 69% | 3054 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 43,033 psi | 66% | 3094 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 41,916 psi | 65% | 3077 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,940 psi | 83% | 3228 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 36,318 psi | 56% | 2841 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 52,837 psi | 81% | 3248 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 36,927 psi | 57% | 2966 fps | 96% |
| Norma MRP | <<locked>> | 80% | 44,759 psi | 69% | 3136 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 53,824 psi | 83% | 3251 fps | 100% |
| Ramshot Grand | 73.2 gr | 82% | 43,308 psi | 67% | 3107 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 52,910 psi | 81% | 3251 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,129 psi | 56% | 2890 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 44% | 2008 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 54,360 psi | 84% | 3317 fps | 100% |
| ReloadSwiss RS 76 | 74.3 gr | 80% | 33,881 psi | 52% | 2900 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 45,455 psi | 70% | 3163 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,920 psi | 72% | 3104 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 45,672 psi | 70% | 3110 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 80% | 53,940 psi | 83% | 3228 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,360 psi | 84% | 3182 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,339 psi | 70% | 3104 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 48,095 psi | 74% | 3091 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 51,401 psi | 79% | 3196 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,224 psi | 71% | 3087 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 80% | 40,234 psi | 62% | 2940 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 54,563 psi | 84% | 3245 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,498 psi | 70% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,469 psi | 68% | 3123 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 84% | 42,453 psi | 65% | 3051 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 50,038 psi | 77% | 3261 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,853 psi | 84% | 3186 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,885 psi | 60% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,540 psi | 65% | 3002 fps | 96.9% |
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 58 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 107gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,465 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,465 fps. ADI AR 2225 gives the best case fill at 100 %, and 58 of the 58 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 107.0 gr projectile in 0.264" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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 76, Ramshot Grand rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 107gr | Sierra MatchKing 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.