Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 124gr | Hammer Hunter bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 55,593 psi | 86% | 3068 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,812 psi | 89% | 3232 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 84% | 54,824 psi | 84% | 3169 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 84% | 56,971 psi | 88% | 3163 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 55,651 psi | 86% | 3176 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 58,711 psi | 90% | 3219 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 55,259 psi | 85% | 3268 fps | 97.7% |
| ADI AR 2225 | <<locked>> | 98% | 58,044 psi | 89% | 3238 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,145 psi | 88% | 3159 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,550 psi | 87% | 3150 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,057 psi | 86% | 3169 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,812 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 58,769 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,665 psi | 84% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,246 psi | 88% | 3245 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,855 psi | 88% | 3222 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,202 psi | 86% | 3133 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 55,506 psi | 85% | 3156 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 58,407 psi | 90% | 3222 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 56,057 psi | 86% | 3169 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 56,231 psi | 87% | 3176 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 58,175 psi | 90% | 3166 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,261 psi | 88% | 3150 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,087 psi | 88% | 3068 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 58,189 psi | 90% | 3301 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 58% | 2051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,436 psi | 90% | 3146 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 58,001 psi | 89% | 3222 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,724 psi | 87% | 3209 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 57,348 psi | 88% | 3097 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 3232 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,173 psi | 86% | 3182 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,245 psi | 85% | 3179 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 58,102 psi | 89% | 3169 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,754 psi | 60% | 2100 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,839 psi | 84% | 3219 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 58,378 psi | 90% | 3248 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 57,116 psi | 88% | 3130 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 56,188 psi | 86% | 3140 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,811 psi | 86% | 3133 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 58,639 psi | 90% | 3120 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 56,318 psi | 87% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,623 psi | 87% | 3097 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,796 psi | 86% | 3110 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 55,622 psi | 86% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,579 psi | 86% | 3186 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 56,652 psi | 87% | 3179 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 58,639 psi | 90% | 3251 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 56,028 psi | 86% | 3248 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 58,798 psi | 90% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,275 psi | 87% | 3100 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% | 45,049 psi | 69% | 2881 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 50,038 psi | 77% | 3087 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 47,297 psi | 73% | 3022 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 49,690 psi | 76% | 3031 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 44,889 psi | 69% | 2966 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 35,636 psi | 55% | 2740 fps | 95% |
| ADI AR 2218 | <<locked>> | 94% | 47,529 psi | 73% | 3100 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 30,443 psi | 47% | 2625 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,806 psi | 77% | 3025 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,342 psi | 76% | 3018 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,527 psi | 70% | 2969 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,106 psi | 68% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,464 psi | 59% | 2831 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,734 psi | 78% | 3087 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 49,066 psi | 76% | 3087 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,718 psi | 75% | 3064 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,035 psi | 71% | 2940 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 42,293 psi | 65% | 2894 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 35,665 psi | 55% | 2746 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 45,527 psi | 70% | 2969 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 36,187 psi | 56% | 2756 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 47,268 psi | 73% | 2966 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,499 psi | 72% | 2949 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,345 psi | 82% | 3009 fps | 100% |
| Hodgdon Retumbo | 68.8 gr | 80% | 37,492 psi | 58% | 2871 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,369 psi | 44% | 1837 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,138 psi | 74% | 2956 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 43,526 psi | 67% | 2943 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,144 psi | 57% | 2799 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 38,696 psi | 60% | 2743 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 32,648 psi | 50% | 2690 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 48,573 psi | 75% | 3045 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 43,947 psi | 68% | 2959 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 80% | 39,421 psi | 61% | 2815 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 45% | 1880 fps | 100% |
| ReloadSwiss RS 76 | 73.6 gr | 80% | 36,869 psi | 57% | 2838 fps | 98.4% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,801 psi | 66% | 2943 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 50,241 psi | 77% | 3005 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 49,023 psi | 75% | 3009 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,675 psi | 75% | 3005 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 51,256 psi | 79% | 2992 fps | 98.6% |
| Somchem S385 | <<locked>> | 80% | 49,371 psi | 76% | 2982 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 43,134 psi | 66% | 2848 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 52,025 psi | 80% | 3041 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 48,791 psi | 75% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,124 psi | 74% | 3041 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 39,871 psi | 61% | 2835 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 43,888 psi | 68% | 2963 fps | 95.8% |
| Vihtavuori N570 | 80.3 gr | 90% | 48,298 psi | 74% | 3091 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,265 psi | 67% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,643 psi | 70% | 2910 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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 124gr | Hammer Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,301 fps; across all powders the maximum-charge window runs from 2,051 fps to 3,301 fps. Alliant Reloder-50 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 124.0 gr projectile in 0.264" calls for a 1:8.0 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 124gr | Hammer Hunter 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.