Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 100gr | Berger BT Target bullet and 65 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 Accurate MAGPRO.
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% | 57,261 psi | 88% | 3356 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,609 psi | 89% | 3396 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,158 psi | 85% | 3442 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 88% | 56,246 psi | 87% | 3448 fps | 97.3% |
| ADI AR 2209 | <<locked>> | 88% | 58,682 psi | 90% | 3458 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 90% | 57,014 psi | 88% | 3461 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 98% | 55,608 psi | 86% | 3419 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,128 psi | 83% | 3435 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,566 psi | 90% | 3458 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,146 psi | 89% | 3442 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,406 psi | 88% | 3455 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,158 psi | 85% | 3366 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,448 psi | 85% | 3432 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,043 psi | 86% | 3451 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,015 psi | 89% | 3409 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 56,579 psi | 87% | 3435 fps | 99.1% |
| Bofors RP30 | <<locked>> | 96% | 55,390 psi | 85% | 3428 fps | 98.6% |
| Bofors RP5 | <<locked>> | 90% | 57,406 psi | 88% | 3455 fps | 99.3% |
| Bofors RP7 | <<locked>> | 82% | 58,479 psi | 90% | 3389 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 96% | 57,203 psi | 88% | 3451 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 88% | 56,202 psi | 86% | 3386 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,114 psi | 85% | 3363 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,755 psi | 90% | 3369 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,247 psi | 90% | 3579 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,405 psi | 58% | 2254 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,188 psi | 88% | 3376 fps | 99.7% |
| IMR 4831 | <<locked>> | 84% | 57,740 psi | 89% | 3379 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,782 psi | 87% | 3369 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 90% | 55,230 psi | 85% | 3435 fps | 98.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,588 psi | 76% | 3323 fps | 97.3% |
| Lovex S065 | <<locked>> | 82% | 57,334 psi | 88% | 3356 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,840 psi | 86% | 3350 fps | 99.8% |
| Lovex S071 | <<locked>> | 94% | 55,259 psi | 85% | 3320 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,711 psi | 90% | 3435 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 50,299 psi | 77% | 3353 fps | 99.2% |
| Norma MRP | <<locked>> | 88% | 57,464 psi | 88% | 3474 fps | 99.8% |
| Norma URP | <<locked>> | 82% | 55,666 psi | 86% | 3369 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,463 psi | 87% | 3458 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,566 psi | 90% | 3435 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,998 psi | 85% | 3376 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 59% | 2306 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,914 psi | 89% | 3412 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,420 psi | 87% | 3438 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,535 psi | 85% | 3494 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,071 psi | 85% | 3435 fps | 97.3% |
| Rottweil R 904 | <<locked>> | 86% | 55,521 psi | 85% | 3356 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 88% | 57,841 psi | 89% | 3432 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 82% | 58,479 psi | 90% | 3389 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,334 psi | 88% | 3356 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,840 psi | 86% | 3350 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,362 psi | 87% | 3297 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,421 psi | 88% | 3425 fps | 99.3% |
| Somchem S361 | <<locked>> | 86% | 57,130 psi | 88% | 3340 fps | 98% |
| Somchem S365 | <<locked>> | 84% | 56,985 psi | 88% | 3376 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,247 psi | 90% | 3399 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 82% | 57,261 psi | 88% | 3363 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,291 psi | 90% | 3379 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 82% | 56,507 psi | 87% | 3363 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,145 psi | 88% | 3402 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,913 psi | 88% | 3468 fps | 98% |
| Vihtavuori N565 | <<locked>> | 94% | 57,986 psi | 89% | 3451 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 96% | 55,535 psi | 85% | 3445 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,942 psi | 88% | 3304 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,810 psi | 84% | 3448 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,363 psi | 90% | 3392 fps | 99.4% |
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% | 40,611 psi | 63% | 3018 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 53,664 psi | 83% | 3327 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,585 psi | 69% | 3215 fps | 95.4% |
| Accurate MAGPRO | 77.9 gr | 84% | 48,660 psi | 75% | 3291 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 44,527 psi | 69% | 3169 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 46,064 psi | 71% | 3235 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 45,020 psi | 69% | 3196 fps | 96% |
| ADI AR 2225 | <<locked>> | 88% | 35,708 psi | 55% | 2995 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,198 psi | 79% | 3330 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,570 psi | 69% | 3163 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,625 psi | 63% | 3094 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,276 psi | 60% | 3048 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,866 psi | 52% | 2936 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,527 psi | 69% | 3225 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,215 psi | 83% | 3337 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 40,451 psi | 62% | 3087 fps | 95.2% |
| Bofors RP30 | <<locked>> | 90% | 44,831 psi | 69% | 3205 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 40,625 psi | 63% | 3094 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 54,911 psi | 85% | 3327 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 43,004 psi | 66% | 3150 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 82% | 45,672 psi | 70% | 3166 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 48,080 psi | 74% | 3222 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,109 psi | 74% | 3186 fps | 100% |
| Hodgdon Retumbo | 73.7 gr | 84% | 38,087 psi | 59% | 3110 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,992 psi | 43% | 2024 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,198 psi | 77% | 3241 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 50,720 psi | 78% | 3258 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 46,789 psi | 72% | 3169 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 44,512 psi | 69% | 3205 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 43,134 psi | 66% | 3179 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,853 psi | 83% | 3294 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,402 psi | 81% | 3284 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 34,853 psi | 54% | 2871 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 51,126 psi | 79% | 3294 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 37,797 psi | 58% | 3061 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 43,163 psi | 66% | 3176 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 52,156 psi | 80% | 3307 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 44,889 psi | 69% | 3222 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 51,140 psi | 79% | 3301 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 37,376 psi | 58% | 2992 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 44% | 2070 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,070 psi | 83% | 3346 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,489 psi | 81% | 3369 fps | 100% |
| ReloadSwiss RS 76 | 78.9 gr | 84% | 37,768 psi | 58% | 3081 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 47,065 psi | 72% | 3268 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 45,498 psi | 70% | 3146 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,106 psi | 68% | 3150 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 54,911 psi | 85% | 3327 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,853 psi | 83% | 3294 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,402 psi | 81% | 3284 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,866 psi | 81% | 3235 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,758 psi | 67% | 3143 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 46,731 psi | 72% | 3133 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 49,574 psi | 76% | 3248 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,657 psi | 69% | 3130 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 80% | 53,490 psi | 82% | 3297 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,812 psi | 60% | 2976 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 52,852 psi | 81% | 3297 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,816 psi | 67% | 3146 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 46,108 psi | 71% | 3238 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 47,036 psi | 72% | 3232 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 94% | 51,459 psi | 79% | 3363 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,055 psi | 82% | 3241 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,854 psi | 57% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,017 psi | 63% | 3038 fps | 95.6% |
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 65 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 100gr | Berger BT Target. Hodgdon Retumbo delivers the highest muzzle velocity at 3,579 fps; across all powders the maximum-charge window runs from 2,254 fps to 3,579 fps. ADI AR 2225 gives the best case fill at 100 %, and 65 of the 65 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 100.0 gr projectile in 0.264" calls for a 1:10.5 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, Accurate MAGPRO rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 100gr | Berger BT Target 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.