Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 100gr | Barnes X S bullet and 51 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 ReloadSwiss RS 80.
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% | 58,189 psi | 90% | 3360 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,463 psi | 85% | 3445 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 86% | 56,449 psi | 87% | 3442 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 86% | 58,015 psi | 89% | 3435 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 88% | 56,521 psi | 87% | 3442 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 96% | 55,535 psi | 85% | 3412 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 3507 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,175 psi | 90% | 3445 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,740 psi | 89% | 3425 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,392 psi | 88% | 3445 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,564 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,753 psi | 86% | 3428 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,362 psi | 87% | 3448 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,058 psi | 88% | 3383 fps | 96.1% |
| Bofors RP15 | <<locked>> | 90% | 56,811 psi | 87% | 3435 fps | 99.2% |
| Bofors RP30 | <<locked>> | 94% | 55,840 psi | 86% | 3428 fps | 98.7% |
| Bofors RP5 | <<locked>> | 88% | 57,392 psi | 88% | 3445 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 94% | 56,855 psi | 88% | 3438 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 86% | 55,753 psi | 86% | 3369 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,479 psi | 90% | 3419 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,595 psi | 90% | 3356 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,436 psi | 90% | 3579 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 58% | 2257 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,594 psi | 87% | 3353 fps | 99.7% |
| IMR 4831 | <<locked>> | 82% | 58,001 psi | 89% | 3373 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,115 psi | 86% | 3350 fps | 98% |
| IMR 7828 SSC | <<locked>> | 88% | 55,013 psi | 85% | 3422 fps | 98.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,012 psi | 83% | 3406 fps | 98.3% |
| Lovex S071 | <<locked>> | 92% | 56,275 psi | 87% | 3327 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,102 psi | 89% | 3415 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 55,216 psi | 85% | 3442 fps | 99.8% |
| Norma MRP | <<locked>> | 86% | 57,566 psi | 89% | 3468 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 56,333 psi | 87% | 3448 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 82% | 58,233 psi | 90% | 3419 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 55,201 psi | 85% | 3373 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 60% | 2310 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,579 psi | 86% | 3491 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,521 psi | 85% | 3442 fps | 97.5% |
| Rottweil R 904 | <<locked>> | 86% | 58,740 psi | 90% | 3406 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 86% | 57,827 psi | 89% | 3422 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,406 psi | 88% | 3419 fps | 99.3% |
| Somchem S361 | <<locked>> | 84% | 56,826 psi | 87% | 3327 fps | 98% |
| Somchem S365 | <<locked>> | 82% | 57,130 psi | 88% | 3366 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,494 psi | 90% | 3392 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 90% | 58,030 psi | 89% | 3366 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 86% | 57,914 psi | 89% | 3402 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,826 psi | 87% | 3458 fps | 98% |
| Vihtavuori N565 | <<locked>> | 92% | 58,465 psi | 90% | 3455 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 94% | 55,941 psi | 86% | 3445 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,477 psi | 85% | 3451 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,957 psi | 89% | 3376 fps | 99.3% |
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% | 45,005 psi | 69% | 3110 fps | 99% |
| Accurate High Country | <<locked>> | 80% | 48,414 psi | 75% | 3297 fps | 96.7% |
| Accurate MAGPRO | <<locked>> | 82% | 49,284 psi | 76% | 3297 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 47,761 psi | 74% | 3235 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 46,195 psi | 71% | 3225 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 42,685 psi | 66% | 3130 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 34,650 psi | 53% | 2953 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,592 psi | 84% | 3379 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,848 psi | 74% | 3228 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,193 psi | 68% | 3173 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,091 psi | 66% | 3127 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,420 psi | 58% | 3031 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,718 psi | 75% | 3304 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 53,621 psi | 83% | 3317 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 41,263 psi | 64% | 3100 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 42,931 psi | 66% | 3153 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 44,193 psi | 68% | 3173 fps | 96.7% |
| Hodgdon H1000 | <<locked>> | 84% | 40,611 psi | 63% | 3081 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 45,803 psi | 70% | 3159 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 48,080 psi | 74% | 3212 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,692 psi | 80% | 3245 fps | 100% |
| Hodgdon Retumbo | 72.2 gr | 82% | 39,088 psi | 60% | 3133 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 44% | 2028 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,287 psi | 82% | 3294 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 54,346 psi | 84% | 3310 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,717 psi | 72% | 3156 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 44,860 psi | 69% | 3205 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 44,425 psi | 68% | 3202 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 39,175 psi | 60% | 2976 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 54,447 psi | 84% | 3346 fps | 98.7% |
| Norma 217 | <<locked>> | 88% | 36,898 psi | 57% | 3031 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 46,905 psi | 72% | 3255 fps | 98.6% |
| Ramshot Grand | <<locked>> | 80% | 42,148 psi | 65% | 3150 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 54,650 psi | 84% | 3356 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 38,522 psi | 59% | 3015 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,269 psi | 45% | 2077 fps | 100% |
| ReloadSwiss RS 76 | 75.4 gr | 80% | 36,172 psi | 56% | 3031 fps | 95.7% |
| ReloadSwiss RS 80 | 85.5 gr | 90% | 47,950 psi | 74% | 3284 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 48,631 psi | 75% | 3209 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 47,514 psi | 73% | 3219 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,152 psi | 73% | 3212 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 49,980 psi | 77% | 3196 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 53,606 psi | 83% | 3310 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,254 psi | 74% | 3199 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 80% | 42,293 psi | 65% | 3051 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 80% | 47,906 psi | 74% | 3222 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,412 psi | 71% | 3238 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 84% | 45,063 psi | 69% | 3176 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 90% | 48,675 psi | 75% | 3294 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,336 psi | 64% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,527 psi | 69% | 3114 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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 100gr | Barnes X S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,579 fps; across all powders the maximum-charge window runs from 2,257 fps to 3,579 fps. ADI AR 2225 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 100.0 gr projectile in 0.264" calls for a 1:11.0 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, ReloadSwiss RS 80 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 100gr | Barnes X S 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.