Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Barnes Match Burner BT bullet and 49 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 56,144 psi | 86% | 3107 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 58,073 psi | 89% | 3268 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 55,317 psi | 85% | 3209 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 84% | 57,116 psi | 88% | 3199 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 55,782 psi | 86% | 3209 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 94% | 54,868 psi | 84% | 3189 fps | 99.6% |
| ADI AR 2218 | <<locked>> | 98% | 55,637 psi | 86% | 3297 fps | 97.4% |
| ADI AR 2225 | <<locked>> | 98% | 58,204 psi | 90% | 3274 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,710 psi | 87% | 3186 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,304 psi | 87% | 3205 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 58,276 psi | 90% | 3169 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,259 psi | 85% | 3189 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,230 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,711 psi | 89% | 3281 fps | 97.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,595 psi | 89% | 3264 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,333 psi | 87% | 3166 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 55,738 psi | 86% | 3192 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 58,798 psi | 90% | 3261 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 56,304 psi | 87% | 3205 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 56,478 psi | 87% | 3212 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 58,508 psi | 90% | 3205 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,392 psi | 88% | 3186 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,406 psi | 88% | 3104 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 58,407 psi | 90% | 3343 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 58% | 2080 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,552 psi | 90% | 3176 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 58,305 psi | 90% | 3261 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,087 psi | 88% | 3245 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 58,146 psi | 89% | 3140 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 3274 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,405 psi | 87% | 3219 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,637 psi | 86% | 3215 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 90% | 58,465 psi | 90% | 3209 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 60% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,361 psi | 85% | 3261 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,592 psi | 84% | 3212 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 84% | 57,537 psi | 89% | 3166 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 56,681 psi | 87% | 3182 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,304 psi | 87% | 3176 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,259 psi | 85% | 3094 fps | 99% |
| Somchem S385 | <<locked>> | 84% | 56,913 psi | 88% | 3146 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,855 psi | 88% | 3130 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 56,391 psi | 87% | 3146 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,767 psi | 86% | 3219 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 90% | 57,217 psi | 88% | 3215 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 92% | 55,143 psi | 85% | 3222 fps | 98.3% |
| Vihtavuori N570 | <<locked>> | 94% | 56,347 psi | 87% | 3281 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,955 psi | 85% | 3199 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,724 psi | 87% | 3143 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% | 45,977 psi | 71% | 2927 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 50,633 psi | 78% | 3133 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 47,906 psi | 74% | 3061 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 49,951 psi | 77% | 3068 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 45,194 psi | 70% | 2999 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 38,696 psi | 60% | 2844 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 96% | 51,488 psi | 79% | 3215 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,009 psi | 48% | 2664 fps | 95.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,850 psi | 77% | 3061 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,977 psi | 71% | 3005 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,788 psi | 69% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,914 psi | 60% | 2871 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,155 psi | 79% | 3127 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 49,501 psi | 76% | 3123 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 53,519 psi | 82% | 3189 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,166 psi | 71% | 2969 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 42,786 psi | 66% | 2936 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 39,030 psi | 60% | 2858 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 45,977 psi | 71% | 3005 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 36,622 psi | 56% | 2792 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,776 psi | 74% | 3005 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,818 psi | 72% | 2986 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,751 psi | 83% | 3048 fps | 100% |
| Hodgdon Retumbo | 69.3 gr | 80% | 37,942 psi | 58% | 2910 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,428 psi | 75% | 2992 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 44,048 psi | 68% | 2982 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,826 psi | 58% | 2844 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 39,523 psi | 61% | 2789 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 33,286 psi | 51% | 2736 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 49,168 psi | 76% | 3087 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 44,483 psi | 68% | 2999 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 80% | 40,074 psi | 62% | 2858 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,196 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | 74.2 gr | 80% | 37,492 psi | 58% | 2884 fps | 98.2% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 43,424 psi | 67% | 2982 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 50,546 psi | 78% | 3041 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 49,429 psi | 76% | 3048 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,081 psi | 76% | 3041 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 51,750 psi | 80% | 3028 fps | 98.4% |
| Somchem S385 | <<locked>> | 80% | 49,835 psi | 77% | 3022 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 43,743 psi | 67% | 2887 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 49,414 psi | 76% | 3028 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,675 psi | 75% | 3081 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 40,480 psi | 62% | 2874 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 44,454 psi | 68% | 3002 fps | 95.6% |
| Vihtavuori N570 | 82.7 gr | 92% | 52,417 psi | 81% | 3205 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,743 psi | 67% | 3002 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,035 psi | 71% | 2946 fps | 98.7% |
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 | 120gr | Barnes Match Burner BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,343 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,343 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 120.0 gr projectile in 0.264" calls for a 1:10.0 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 | 120gr | Barnes Match Burner BT 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.