Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 122gr | THAC EDH bullet and 49 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 ADI AR 2218.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 57,421 psi | 88% | 3100 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 55,912 psi | 86% | 3199 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 57,653 psi | 89% | 3179 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,275 psi | 87% | 3192 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 94% | 55,361 psi | 85% | 3173 fps | 99.6% |
| ADI AR 2218 | <<locked>> | 98% | 55,999 psi | 86% | 3287 fps | 97.5% |
| ADI AR 2225 | <<locked>> | 98% | 58,595 psi | 90% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,188 psi | 88% | 3166 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,072 psi | 88% | 3192 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,463 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,680 psi | 86% | 3176 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,043 psi | 86% | 3189 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,957 psi | 89% | 3268 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,566 psi | 90% | 3268 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,391 psi | 87% | 3143 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 56,521 psi | 87% | 3186 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 55,796 psi | 86% | 3189 fps | 99.6% |
| Bofors RP5 | <<locked>> | 86% | 57,072 psi | 88% | 3192 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 56,695 psi | 87% | 3196 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 55,303 psi | 85% | 3123 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,957 psi | 89% | 3166 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 58,088 psi | 89% | 3087 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 58,769 psi | 90% | 3327 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,913 psi | 58% | 2051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,550 psi | 85% | 3100 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 58,726 psi | 90% | 3241 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,711 psi | 89% | 3238 fps | 99.8% |
| Lovex S071 | <<locked>> | 90% | 55,854 psi | 86% | 3077 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,376 psi | 85% | 3205 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,276 psi | 88% | 3209 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,159 psi | 86% | 3202 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 88% | 54,839 psi | 84% | 3130 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,059 psi | 60% | 2100 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,753 psi | 86% | 3248 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,463 psi | 85% | 3212 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 84% | 58,073 psi | 89% | 3146 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 57,188 psi | 88% | 3163 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,840 psi | 87% | 3159 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,825 psi | 86% | 3077 fps | 99% |
| Somchem S385 | <<locked>> | 84% | 57,725 psi | 89% | 3133 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,667 psi | 89% | 3117 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,101 psi | 88% | 3136 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 57,479 psi | 88% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,492 psi | 87% | 3209 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 58,117 psi | 89% | 3212 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 92% | 55,666 psi | 86% | 3212 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 94% | 56,898 psi | 88% | 3274 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,724 psi | 86% | 3196 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,261 psi | 88% | 3123 fps | 99.9% |
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% | 47,297 psi | 73% | 2930 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 48,791 psi | 75% | 3061 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 50,618 psi | 78% | 3054 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 45,963 psi | 71% | 2995 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 37,159 psi | 57% | 2785 fps | 95.3% |
| ADI AR 2218 | 83 gr | 94% | 48,428 psi | 75% | 3127 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 32,242 psi | 50% | 2687 fps | 96.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,386 psi | 78% | 3045 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,978 psi | 72% | 3005 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,701 psi | 70% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,943 psi | 61% | 2877 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,112 psi | 80% | 3127 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 50,343 psi | 77% | 3127 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,676 psi | 78% | 3120 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,673 psi | 72% | 2956 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 43,714 psi | 67% | 2933 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 37,521 psi | 58% | 2805 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 46,978 psi | 72% | 3005 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 37,652 psi | 58% | 2799 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 80% | 48,443 psi | 75% | 2992 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,630 psi | 73% | 2976 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,607 psi | 84% | 3035 fps | 100% |
| Hodgdon Retumbo | 66.7 gr | 80% | 39,015 psi | 60% | 2920 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 44% | 1841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,081 psi | 76% | 2979 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 44,730 psi | 69% | 2976 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 39,059 psi | 60% | 2861 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 41,046 psi | 63% | 2799 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 32,445 psi | 50% | 2703 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 49,908 psi | 77% | 3081 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 45,150 psi | 69% | 2995 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 41,089 psi | 63% | 2864 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,428 psi | 45% | 1883 fps | 100% |
| ReloadSwiss RS 76 | 71.4 gr | 80% | 38,595 psi | 59% | 2897 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 41,423 psi | 64% | 2923 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 51,155 psi | 79% | 3025 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 50,270 psi | 77% | 3038 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,922 psi | 77% | 3035 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 52,417 psi | 81% | 3015 fps | 98.5% |
| Somchem S385 | <<locked>> | 80% | 50,952 psi | 78% | 3015 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 44,556 psi | 69% | 2881 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 53,563 psi | 82% | 3071 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 50,604 psi | 78% | 3025 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,327 psi | 76% | 3071 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 41,756 psi | 64% | 2884 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 42,351 psi | 65% | 2936 fps | 95% |
| Vihtavuori N570 | <<locked>> | 90% | 49,632 psi | 76% | 3133 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,788 psi | 69% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,876 psi | 72% | 2940 fps | 98.9% |
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 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 122gr | THAC EDH. Hodgdon Retumbo delivers the highest muzzle velocity at 3,327 fps; across all powders the maximum-charge window runs from 2,051 fps to 3,327 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 49 of the 49 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 122.0 gr projectile in 0.264" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, 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, ADI AR 2218 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 122gr | THAC EDH 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.