Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 105gr | Ferrobull Entox Sport bullet and 68 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 Vihtavuori N560.
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>> | 90% | 56,623 psi | 87% | 3287 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,811 psi | 87% | 3323 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,795 psi | 84% | 3383 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 88% | 55,738 psi | 86% | 3386 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 88% | 58,421 psi | 90% | 3399 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 90% | 56,652 psi | 87% | 3396 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 98% | 55,143 psi | 85% | 3360 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,693 psi | 83% | 3376 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,363 psi | 90% | 3396 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,885 psi | 89% | 3383 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,884 psi | 88% | 3389 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,624 psi | 90% | 3363 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,042 psi | 85% | 3369 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,434 psi | 85% | 3386 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,406 psi | 88% | 3442 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,696 psi | 89% | 3350 fps | 96.6% |
| Bofors RP15 | <<locked>> | 92% | 56,072 psi | 86% | 3373 fps | 99.3% |
| Bofors RP30 | <<locked>> | 98% | 58,639 psi | 90% | 3435 fps | 99.3% |
| Bofors RP5 | <<locked>> | 90% | 56,884 psi | 88% | 3389 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 58,131 psi | 89% | 3327 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 56,782 psi | 87% | 3389 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 58,639 psi | 90% | 3386 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,941 psi | 86% | 3323 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,682 psi | 90% | 3376 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,233 psi | 90% | 3304 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,044 psi | 89% | 3520 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,347 psi | 57% | 2201 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,782 psi | 87% | 3310 fps | 99.8% |
| IMR 4831 | <<locked>> | 84% | 57,392 psi | 88% | 3317 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,507 psi | 87% | 3310 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 90% | 54,795 psi | 84% | 3369 fps | 98.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,936 psi | 75% | 3261 fps | 97.5% |
| Lovex S065 | <<locked>> | 82% | 56,869 psi | 88% | 3291 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,390 psi | 85% | 3284 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 58,247 psi | 90% | 3317 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,392 psi | 90% | 3373 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 49,806 psi | 77% | 3291 fps | 99.3% |
| Norma MRP | <<locked>> | 88% | 57,188 psi | 88% | 3412 fps | 99.9% |
| Norma URP | <<locked>> | 82% | 55,303 psi | 85% | 3307 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,086 psi | 86% | 3399 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 84% | 58,204 psi | 90% | 3369 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,636 psi | 84% | 3317 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 59% | 2254 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,377 psi | 88% | 3346 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,086 psi | 86% | 3376 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,882 psi | 84% | 3432 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,375 psi | 84% | 3373 fps | 97.5% |
| Rottweil R 904 | <<locked>> | 86% | 55,143 psi | 85% | 3294 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 88% | 57,435 psi | 88% | 3369 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 58,131 psi | 89% | 3327 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,869 psi | 88% | 3291 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,390 psi | 85% | 3284 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,941 psi | 86% | 3238 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,029 psi | 88% | 3363 fps | 99.5% |
| Somchem S361 | <<locked>> | 86% | 56,884 psi | 88% | 3284 fps | 98.3% |
| Somchem S365 | <<locked>> | 84% | 56,391 psi | 87% | 3307 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,841 psi | 89% | 3337 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 56,753 psi | 87% | 3297 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,841 psi | 89% | 3317 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 56,173 psi | 86% | 3301 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,507 psi | 87% | 3330 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,710 psi | 87% | 3406 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 94% | 57,276 psi | 88% | 3386 fps | 98.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,042 psi | 85% | 3383 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,666 psi | 87% | 3241 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,639 psi | 90% | 3386 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,769 psi | 90% | 3451 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,870 psi | 89% | 3330 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% | 39,813 psi | 61% | 2953 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 52,982 psi | 82% | 3258 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,947 psi | 68% | 3150 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 48,211 psi | 74% | 3232 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,135 psi | 68% | 3110 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 82% | 42,511 psi | 65% | 3097 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 90% | 41,423 psi | 64% | 3061 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 35,128 psi | 54% | 2933 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,836 psi | 78% | 3264 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,135 psi | 68% | 3104 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,132 psi | 62% | 3031 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,667 psi | 60% | 2982 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,286 psi | 51% | 2874 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,888 psi | 68% | 3159 fps | 99.7% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,200 psi | 82% | 3356 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,012 psi | 83% | 3284 fps | 95.7% |
| Bofors RP15 | <<locked>> | 82% | 39,929 psi | 61% | 3022 fps | 95.4% |
| Bofors RP30 | <<locked>> | 88% | 41,249 psi | 63% | 3071 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 40,132 psi | 62% | 3031 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 54,433 psi | 84% | 3261 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 39,494 psi | 61% | 3015 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 54,665 psi | 84% | 3317 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 82% | 45,179 psi | 70% | 3107 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 44,454 psi | 68% | 3091 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,761 psi | 74% | 3127 fps | 100% |
| Hodgdon Retumbo | 72.4 gr | 84% | 37,507 psi | 58% | 3048 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1975 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,864 psi | 77% | 3182 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 50,183 psi | 77% | 3192 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,337 psi | 67% | 3038 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 44,222 psi | 68% | 3150 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 42,337 psi | 65% | 3110 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 53,316 psi | 82% | 3228 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,880 psi | 80% | 3222 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 34,055 psi | 52% | 2802 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 50,633 psi | 78% | 3228 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 37,028 psi | 57% | 2992 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 42,496 psi | 65% | 3110 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 51,692 psi | 80% | 3238 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 41,075 psi | 63% | 3081 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 50,604 psi | 78% | 3232 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 36,767 psi | 57% | 2933 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 44% | 2021 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,432 psi | 82% | 3281 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,127 psi | 80% | 3304 fps | 100% |
| ReloadSwiss RS 76 | 75.7 gr | 82% | 34,374 psi | 53% | 2936 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 46,383 psi | 71% | 3209 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,092 psi | 69% | 3087 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,569 psi | 67% | 3091 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 54,433 psi | 84% | 3261 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,316 psi | 82% | 3228 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,880 psi | 80% | 3222 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,373 psi | 81% | 3173 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,236 psi | 67% | 3081 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 46,209 psi | 71% | 3074 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 49,081 psi | 76% | 3182 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,092 psi | 68% | 3068 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 80% | 53,069 psi | 82% | 3235 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,290 psi | 59% | 2917 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 52,446 psi | 81% | 3235 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,076 psi | 66% | 3077 fps | 99.8% |
| Vihtavuori N560 | 73.4 gr | 82% | 45,614 psi | 70% | 3176 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 86% | 43,207 psi | 66% | 3094 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 47,398 psi | 73% | 3225 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,663 psi | 81% | 3179 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,882 psi | 84% | 3323 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,143 psi | 56% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,567 psi | 62% | 2982 fps | 96% |
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 68 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 105gr | Ferrobull Entox Sport. Hodgdon Retumbo delivers the highest muzzle velocity at 3,520 fps; across all powders the maximum-charge window runs from 2,201 fps to 3,520 fps. ADI AR 2225 gives the best case fill at 100 %, and 68 of the 68 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 105.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-33, Hodgdon TrailBoss 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, Vihtavuori N560 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 105gr | Ferrobull Entox Sport 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.