Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 126gr | Lehigh Defense Controlled Chaos 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 56,492 psi | 87% | 3054 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 55,434 psi | 85% | 3153 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 57,348 psi | 88% | 3143 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,202 psi | 86% | 3156 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 94% | 55,158 psi | 85% | 3133 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 55,767 psi | 86% | 3248 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 98% | 58,581 psi | 90% | 3219 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,971 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,710 psi | 87% | 3150 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 58,465 psi | 90% | 3110 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,347 psi | 85% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,521 psi | 85% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,827 psi | 89% | 3228 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 3212 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,565 psi | 87% | 3110 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 55,941 psi | 86% | 3140 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 55,259 psi | 85% | 3143 fps | 99.7% |
| Bofors RP5 | <<locked>> | 86% | 56,710 psi | 87% | 3150 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,797 psi | 87% | 3159 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 58,697 psi | 90% | 3146 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,798 psi | 89% | 3130 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,653 psi | 89% | 3045 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 58,740 psi | 90% | 3287 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 58% | 2024 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,172 psi | 85% | 3061 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 88% | 58,595 psi | 90% | 3202 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,363 psi | 88% | 3196 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 58,320 psi | 90% | 3081 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 58,769 psi | 90% | 3219 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,884 psi | 88% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,956 psi | 86% | 3163 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 58,595 psi | 90% | 3153 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 60% | 2073 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,651 psi | 86% | 3202 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,723 psi | 84% | 3163 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 57,711 psi | 89% | 3110 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 56,913 psi | 88% | 3123 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,536 psi | 87% | 3120 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,434 psi | 85% | 3038 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 57,188 psi | 88% | 3091 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,276 psi | 88% | 3077 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,652 psi | 87% | 3097 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 56,579 psi | 87% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,231 psi | 87% | 3169 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 57,450 psi | 88% | 3163 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 55,361 psi | 85% | 3169 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 94% | 56,681 psi | 87% | 3232 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,317 psi | 85% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,942 psi | 88% | 3087 fps | 100% |
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% | 46,050 psi | 71% | 2874 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 48,196 psi | 74% | 3015 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 50,198 psi | 77% | 3015 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 45,484 psi | 70% | 2953 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 36,361 psi | 56% | 2736 fps | 95.4% |
| ADI AR 2218 | 83.9 gr | 94% | 48,008 psi | 74% | 3087 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 31,241 psi | 48% | 2628 fps | 96.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,937 psi | 77% | 3002 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,267 psi | 71% | 2956 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,005 psi | 69% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,175 psi | 60% | 2825 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,517 psi | 79% | 3074 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 49,632 psi | 76% | 3074 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 49,676 psi | 76% | 3064 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,485 psi | 72% | 2920 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 42,989 psi | 66% | 2887 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 36,521 psi | 56% | 2746 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 46,267 psi | 71% | 2956 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 36,883 psi | 57% | 2753 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 47,906 psi | 74% | 2953 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,137 psi | 73% | 2933 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,099 psi | 83% | 2992 fps | 100% |
| Hodgdon Retumbo | 67.4 gr | 80% | 38,247 psi | 59% | 2867 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 44% | 1814 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,646 psi | 75% | 2940 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 44,179 psi | 68% | 2930 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 38,000 psi | 58% | 2799 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 39,769 psi | 61% | 2743 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 31,227 psi | 48% | 2631 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 49,400 psi | 76% | 3035 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 44,715 psi | 69% | 2949 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,350 psi | 62% | 2815 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 45% | 1857 fps | 100% |
| ReloadSwiss RS 76 | 72.1 gr | 80% | 37,652 psi | 58% | 2838 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 40,509 psi | 62% | 2867 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 50,734 psi | 78% | 2986 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 49,661 psi | 76% | 2992 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,313 psi | 76% | 2989 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 51,837 psi | 80% | 2976 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 50,140 psi | 77% | 2969 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 43,816 psi | 67% | 2835 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 52,823 psi | 81% | 3028 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 49,647 psi | 76% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,907 psi | 75% | 3028 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 40,814 psi | 63% | 2831 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 41,394 psi | 64% | 2881 fps | 95% |
| Vihtavuori N570 | <<locked>> | 90% | 49,081 psi | 76% | 3087 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,005 psi | 68% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,354 psi | 71% | 2894 fps | 99% |
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 57 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 126gr | Lehigh Defense Controlled Chaos. Hodgdon Retumbo delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 2,024 fps to 3,287 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 126.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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 | 126gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Hodgdon US 869, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.