Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 108gr | Reichenberg HDB Universal bullet and 55 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% | 56,434 psi | 87% | 3245 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 58,334 psi | 90% | 3406 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 86% | 55,477 psi | 85% | 3337 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 86% | 57,667 psi | 89% | 3343 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 88% | 56,202 psi | 86% | 3346 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 96% | 54,984 psi | 85% | 3314 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,986 psi | 89% | 3406 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,566 psi | 89% | 3337 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,232 psi | 88% | 3327 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,681 psi | 87% | 3343 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,494 psi | 90% | 3317 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,056 psi | 85% | 3323 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,216 psi | 85% | 3333 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,537 psi | 89% | 3402 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,797 psi | 87% | 3297 fps | 96.8% |
| Bofors RP15 | <<locked>> | 90% | 55,869 psi | 86% | 3327 fps | 99.4% |
| Bofors RP30 | <<locked>> | 96% | 58,755 psi | 90% | 3392 fps | 99.5% |
| Bofors RP5 | <<locked>> | 88% | 56,681 psi | 87% | 3343 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 94% | 56,565 psi | 87% | 3343 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 86% | 55,230 psi | 85% | 3274 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,073 psi | 89% | 3323 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,899 psi | 89% | 3255 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,015 psi | 89% | 3474 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 58% | 2182 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,086 psi | 86% | 3258 fps | 99.8% |
| IMR 4831 | <<locked>> | 82% | 56,753 psi | 87% | 3261 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,695 psi | 86% | 3255 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 90% | 58,450 psi | 90% | 3392 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,997 psi | 82% | 3301 fps | 98.6% |
| Lovex S070 | <<locked>> | 82% | 58,276 psi | 90% | 3294 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,204 psi | 90% | 3274 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,421 psi | 88% | 3314 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 54,172 psi | 83% | 3333 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 56,652 psi | 87% | 3360 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,334 psi | 90% | 3314 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,695 psi | 86% | 3350 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 82% | 57,406 psi | 88% | 3314 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,711 psi | 90% | 3343 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 59% | 2228 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,955 psi | 85% | 3389 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,491 psi | 84% | 3333 fps | 97.8% |
| Rottweil R 904 | <<locked>> | 86% | 58,059 psi | 89% | 3304 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 56,913 psi | 88% | 3317 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 82% | 58,276 psi | 90% | 3294 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,521 psi | 87% | 3310 fps | 99.6% |
| Somchem S361 | <<locked>> | 84% | 55,970 psi | 86% | 3228 fps | 98.4% |
| Somchem S365 | <<locked>> | 82% | 56,159 psi | 86% | 3258 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,334 psi | 88% | 3284 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 90% | 57,406 psi | 88% | 3271 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 86% | 56,449 psi | 87% | 3287 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,057 psi | 86% | 3353 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 92% | 57,261 psi | 88% | 3343 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 94% | 55,042 psi | 85% | 3343 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,520 psi | 84% | 3337 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,377 psi | 88% | 3281 fps | 99.6% |
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% | 43,091 psi | 66% | 2989 fps | 99.1% |
| Accurate High Country | <<locked>> | 80% | 47,253 psi | 73% | 3182 fps | 97% |
| Accurate MAGPRO | <<locked>> | 82% | 48,051 psi | 74% | 3189 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 47,021 psi | 72% | 3136 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 42,235 psi | 65% | 3054 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 41,524 psi | 64% | 3028 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 33,069 psi | 51% | 2835 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,838 psi | 83% | 3274 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,992 psi | 72% | 3127 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,989 psi | 66% | 3061 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,640 psi | 64% | 3009 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,114 psi | 56% | 2917 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,529 psi | 73% | 3192 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 53,258 psi | 82% | 3320 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,937 psi | 77% | 3163 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 40,016 psi | 62% | 2986 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 41,611 psi | 64% | 3038 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 42,989 psi | 66% | 3061 fps | 97% |
| Hodgdon H1000 | <<locked>> | 84% | 39,523 psi | 61% | 2982 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 44,918 psi | 69% | 3064 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,063 psi | 68% | 3045 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,720 psi | 78% | 3136 fps | 100% |
| Hodgdon Retumbo | 71.9 gr | 82% | 37,855 psi | 58% | 3018 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 43% | 1955 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,663 psi | 81% | 3196 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 53,200 psi | 82% | 3202 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,905 psi | 71% | 3061 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,031 psi | 63% | 3031 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 94% | 43,033 psi | 66% | 3087 fps | 96.1% |
| Lovex S070 | <<locked>> | 80% | 54,723 psi | 84% | 3232 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 37,028 psi | 57% | 2844 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 53,577 psi | 82% | 3245 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 35,244 psi | 54% | 2904 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 45,788 psi | 70% | 3146 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 54,679 psi | 84% | 3251 fps | 100% |
| Ramshot Grand | 72.2 gr | 80% | 41,089 psi | 63% | 3041 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 53,664 psi | 83% | 3248 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,999 psi | 57% | 2900 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 45% | 2005 fps | 100% |
| ReloadSwiss RS 76 | 75.1 gr | 80% | 34,679 psi | 53% | 2910 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 46,659 psi | 72% | 3173 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 47,819 psi | 74% | 3110 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 46,470 psi | 72% | 3114 fps | 98% |
| Shooters World SW4350 | <<locked>> | 80% | 54,723 psi | 84% | 3232 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,122 psi | 71% | 3107 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 48,892 psi | 75% | 3094 fps | 96.9% |
| Somchem S365 | <<locked>> | 80% | 52,547 psi | 81% | 3199 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,934 psi | 72% | 3091 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,075 psi | 63% | 2946 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 80% | 46,311 psi | 71% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,455 psi | 70% | 3133 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 84% | 43,366 psi | 67% | 3058 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 47,529 psi | 73% | 3189 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,856 psi | 61% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,221 psi | 67% | 3005 fps | 97.2% |
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 55 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 108gr | Reichenberg HDB Universal. Hodgdon Retumbo delivers the highest muzzle velocity at 3,474 fps; across all powders the maximum-charge window runs from 2,182 fps to 3,474 fps. ADI AR 2225 gives the best case fill at 100 %, and 55 of the 55 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 108.0 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, Ramshot Grand rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 108gr | Reichenberg HDB Universal 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.