Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Berger BT Target 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.
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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% | 55,695 psi | 86% | 3104 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,827 psi | 89% | 3268 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 54,911 psi | 85% | 3202 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 84% | 56,681 psi | 87% | 3192 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 55,347 psi | 85% | 3202 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 58,465 psi | 90% | 3248 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 55,085 psi | 85% | 3287 fps | 97.2% |
| ADI AR 2225 | <<locked>> | 98% | 57,812 psi | 89% | 3271 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,884 psi | 88% | 3189 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,289 psi | 87% | 3179 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,869 psi | 86% | 3199 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,841 psi | 89% | 3166 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 58,407 psi | 90% | 3238 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,752 psi | 84% | 3189 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,116 psi | 88% | 3274 fps | 97.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,971 psi | 88% | 3255 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,796 psi | 86% | 3156 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 55,317 psi | 85% | 3186 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 58,421 psi | 90% | 3258 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,869 psi | 86% | 3199 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 92% | 55,840 psi | 86% | 3202 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 58,102 psi | 89% | 3196 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,985 psi | 88% | 3179 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,927 psi | 88% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,885 psi | 89% | 3333 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 58% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,639 psi | 90% | 3163 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,160 psi | 90% | 3173 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 57,856 psi | 89% | 3251 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,695 psi | 87% | 3238 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 57,711 psi | 89% | 3133 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 3264 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,202 psi | 86% | 3215 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,172 psi | 85% | 3209 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 90% | 57,827 psi | 89% | 3199 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,769 psi | 60% | 2126 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,650 psi | 84% | 3248 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 58,334 psi | 90% | 3281 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 57,101 psi | 88% | 3159 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 56,231 psi | 87% | 3173 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,854 psi | 86% | 3169 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 58,639 psi | 90% | 3150 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,478 psi | 87% | 3140 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,463 psi | 87% | 3127 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 55,912 psi | 86% | 3140 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,579 psi | 86% | 3215 fps | 99% |
| Vihtavuori N565 | <<locked>> | 90% | 56,797 psi | 87% | 3209 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 58,566 psi | 90% | 3281 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,985 psi | 86% | 3278 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 58,740 psi | 90% | 3261 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,333 psi | 87% | 3133 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% | 45,556 psi | 70% | 2920 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 50,212 psi | 77% | 3123 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 80% | 47,485 psi | 73% | 3054 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 49,545 psi | 76% | 3061 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 44,759 psi | 69% | 2992 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 38,334 psi | 59% | 2838 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 51,184 psi | 79% | 3209 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,821 psi | 47% | 2661 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,893 psi | 77% | 3061 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,429 psi | 76% | 3054 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,542 psi | 70% | 2999 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,338 psi | 68% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,522 psi | 59% | 2861 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,676 psi | 78% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 49,139 psi | 76% | 3117 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 52,968 psi | 82% | 3182 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,994 psi | 75% | 3028 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,525 psi | 65% | 2930 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 38,624 psi | 59% | 2851 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,542 psi | 70% | 2999 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 36,419 psi | 56% | 2789 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 47,369 psi | 73% | 2995 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,441 psi | 71% | 2979 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,476 psi | 82% | 3045 fps | 100% |
| Hodgdon Retumbo | 68.9 gr | 80% | 37,695 psi | 58% | 2904 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 44% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,042 psi | 85% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,051 psi | 74% | 2986 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,656 psi | 67% | 2976 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,478 psi | 58% | 2835 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 39,276 psi | 60% | 2782 fps | 99% |
| Norma 217 | <<locked>> | 84% | 32,909 psi | 51% | 2726 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 48,704 psi | 75% | 3077 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 44,019 psi | 68% | 2992 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 80% | 39,697 psi | 61% | 2851 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 45% | 1903 fps | 100% |
| ReloadSwiss RS 76 | 73.7 gr | 80% | 37,130 psi | 57% | 2874 fps | 98.1% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 43,062 psi | 66% | 2976 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 50,111 psi | 77% | 3031 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 49,168 psi | 76% | 3045 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,834 psi | 75% | 3038 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 51,372 psi | 79% | 3022 fps | 98.3% |
| Somchem S385 | <<locked>> | 80% | 49,429 psi | 76% | 3015 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 43,381 psi | 67% | 2881 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 49,139 psi | 76% | 3025 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,240 psi | 74% | 3074 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 40,277 psi | 62% | 2871 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 86% | 43,888 psi | 68% | 2989 fps | 95.3% |
| Vihtavuori N570 | 82.2 gr | 92% | 52,040 psi | 80% | 3202 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,236 psi | 67% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,832 psi | 71% | 2943 fps | 98.6% |
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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Berger BT Target. Hodgdon Retumbo delivers the highest muzzle velocity at 3,333 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,333 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 120.0 gr projectile in 0.264" calls for a 1:9.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | 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.