Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 105gr | Impala LW CFN bullet and 50 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>> | 86% | 55,405 psi | 85% | 3255 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,318 psi | 87% | 3399 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 86% | 57,232 psi | 88% | 3402 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 84% | 55,085 psi | 85% | 3323 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 88% | 57,406 psi | 88% | 3399 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 96% | 56,391 psi | 87% | 3369 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 98% | 55,347 psi | 85% | 3396 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,434 psi | 85% | 3320 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,668 psi | 90% | 3383 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,218 psi | 90% | 3399 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,347 psi | 87% | 3314 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,594 psi | 87% | 3383 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,421 psi | 88% | 3406 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,769 psi | 89% | 3340 fps | 96.7% |
| Bofors RP15 | <<locked>> | 90% | 57,624 psi | 89% | 3386 fps | 99.5% |
| Bofors RP30 | <<locked>> | 94% | 56,710 psi | 87% | 3389 fps | 99.1% |
| Bofors RP5 | <<locked>> | 88% | 58,218 psi | 90% | 3399 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 94% | 57,754 psi | 89% | 3392 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 86% | 56,507 psi | 87% | 3323 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,666 psi | 86% | 3307 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,753 psi | 86% | 3251 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,637 psi | 86% | 3465 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,840 psi | 58% | 2205 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,319 psi | 88% | 3304 fps | 99.8% |
| IMR 4831 | <<locked>> | 82% | 58,552 psi | 90% | 3320 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,985 psi | 88% | 3307 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 88% | 55,912 psi | 86% | 3379 fps | 98.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,781 psi | 84% | 3366 fps | 98.8% |
| Lovex S071 | <<locked>> | 92% | 57,043 psi | 88% | 3281 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,784 psi | 90% | 3369 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 56,086 psi | 86% | 3399 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 58,523 psi | 90% | 3422 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,159 psi | 88% | 3402 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 90% | 56,101 psi | 86% | 3330 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,914 psi | 60% | 2257 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,521 psi | 87% | 3448 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,478 psi | 87% | 3406 fps | 98% |
| Rottweil R 904 | <<locked>> | 84% | 55,782 psi | 86% | 3291 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 86% | 58,581 psi | 90% | 3373 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,175 psi | 90% | 3369 fps | 99.6% |
| Somchem S361 | <<locked>> | 84% | 57,377 psi | 88% | 3278 fps | 98.4% |
| Somchem S365 | <<locked>> | 82% | 57,943 psi | 89% | 3317 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,492 psi | 85% | 3281 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 88% | 55,347 psi | 85% | 3261 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 86% | 58,682 psi | 90% | 3350 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,740 psi | 89% | 3415 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 90% | 55,550 psi | 85% | 3343 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 94% | 56,739 psi | 87% | 3406 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,420 psi | 87% | 3406 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,969 psi | 85% | 3264 fps | 99.2% |
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% | 45,672 psi | 70% | 3068 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 49,226 psi | 76% | 3255 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 80% | 46,615 psi | 72% | 3186 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 48,457 psi | 75% | 3192 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 43,816 psi | 67% | 3117 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 88% | 43,323 psi | 67% | 3097 fps | 96% |
| ADI AR 2225 | <<locked>> | 84% | 35,186 psi | 54% | 2927 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,921 psi | 75% | 3192 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,486 psi | 75% | 3186 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,831 psi | 69% | 3133 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,729 psi | 67% | 3084 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,058 psi | 59% | 2995 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,719 psi | 77% | 3268 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,259 psi | 84% | 3274 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,916 psi | 65% | 3058 fps | 96.3% |
| Bofors RP30 | <<locked>> | 84% | 40,944 psi | 63% | 3054 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 44,831 psi | 69% | 3133 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 84% | 41,162 psi | 63% | 3048 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 46,485 psi | 72% | 3123 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,585 psi | 70% | 3100 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,286 psi | 80% | 3192 fps | 100% |
| Hodgdon Retumbo | 69.3 gr | 80% | 37,304 psi | 57% | 3028 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 44% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,940 psi | 83% | 3245 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 55,013 psi | 85% | 3261 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,253 psi | 73% | 3110 fps | 96.4% |
| IMR 7828 SSC | <<locked>> | 80% | 42,728 psi | 66% | 3100 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 42,293 psi | 65% | 3100 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 39,653 psi | 61% | 2933 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 55,027 psi | 85% | 3297 fps | 99.1% |
| Norma 217 | <<locked>> | 86% | 35,201 psi | 54% | 2933 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 47,703 psi | 73% | 3219 fps | 99% |
| Ramshot Grand | <<locked>> | 80% | 42,917 psi | 66% | 3110 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 80% | 39,160 psi | 60% | 2979 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 45% | 2028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,796 psi | 57% | 3002 fps | 96.6% |
| ReloadSwiss RS 80 | 82.2 gr | 88% | 45,411 psi | 70% | 3176 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,226 psi | 76% | 3163 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,385 psi | 74% | 3179 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,022 psi | 74% | 3173 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 50,546 psi | 78% | 3150 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 54,346 psi | 84% | 3258 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,921 psi | 75% | 3156 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,946 psi | 66% | 3012 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 48,602 psi | 75% | 3173 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,239 psi | 73% | 3202 fps | 96.2% |
| Vihtavuori N565 | <<locked>> | 82% | 42,801 psi | 66% | 3074 fps | 95.1% |
| Vihtavuori N568 | 81.3 gr | 90% | 49,501 psi | 76% | 3261 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,076 psi | 65% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,194 psi | 70% | 3071 fps | 97.5% |
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 | 105gr | Impala LW CFN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,465 fps; across all powders the maximum-charge window runs from 2,205 fps to 3,465 fps. Hodgdon TrailBoss 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 105.0 gr projectile in 0.264" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, IMR 8133 Enduron, Norma 217 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 | 105gr | Impala LW CFN 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.