Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 123gr | Lapua Scenar 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% | 56,318 psi | 87% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 55,332 psi | 85% | 3182 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 57,203 psi | 88% | 3169 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 55,738 psi | 86% | 3179 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 94% | 55,013 psi | 85% | 3159 fps | 99.7% |
| ADI AR 2218 | <<locked>> | 98% | 55,651 psi | 86% | 3271 fps | 97.6% |
| ADI AR 2225 | <<locked>> | 98% | 58,276 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,840 psi | 87% | 3156 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,275 psi | 87% | 3173 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 58,233 psi | 90% | 3140 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,085 psi | 85% | 3156 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,230 psi | 85% | 3169 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,435 psi | 88% | 3248 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,421 psi | 88% | 3235 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,275 psi | 87% | 3136 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 55,709 psi | 86% | 3166 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 58,769 psi | 90% | 3235 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 56,275 psi | 87% | 3173 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 56,391 psi | 87% | 3182 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 58,479 psi | 90% | 3173 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,348 psi | 88% | 3153 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,421 psi | 88% | 3074 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 58,566 psi | 90% | 3314 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,855 psi | 58% | 2054 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,682 psi | 90% | 3150 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 58,320 psi | 90% | 3228 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,101 psi | 88% | 3219 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 58,088 psi | 89% | 3107 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,637 psi | 87% | 3192 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,680 psi | 86% | 3189 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 58,407 psi | 90% | 3176 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,769 psi | 60% | 2100 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,390 psi | 85% | 3232 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,665 psi | 84% | 3186 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 57,609 psi | 89% | 3140 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 56,565 psi | 87% | 3150 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,188 psi | 86% | 3143 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,259 psi | 85% | 3064 fps | 99.1% |
| Somchem S385 | <<locked>> | 84% | 56,811 psi | 87% | 3114 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,043 psi | 88% | 3104 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,246 psi | 87% | 3120 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 56,434 psi | 87% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,985 psi | 86% | 3192 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 57,101 psi | 88% | 3186 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 92% | 55,158 psi | 85% | 3192 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 94% | 56,405 psi | 87% | 3255 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,998 psi | 85% | 3169 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,724 psi | 87% | 3114 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% | 2900 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 47,834 psi | 74% | 3035 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 49,980 psi | 77% | 3041 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 45,237 psi | 70% | 2976 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 36,143 psi | 56% | 2753 fps | 95% |
| ADI AR 2218 | 84.9 gr | 94% | 47,747 psi | 73% | 3104 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,038 psi | 48% | 2644 fps | 95.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,864 psi | 77% | 3031 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,006 psi | 71% | 2979 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,773 psi | 69% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,957 psi | 60% | 2844 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,314 psi | 79% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 49,574 psi | 76% | 3100 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 49,501 psi | 76% | 3084 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,166 psi | 71% | 2940 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 42,772 psi | 66% | 2907 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 36,434 psi | 56% | 2769 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 46,006 psi | 71% | 2979 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 36,651 psi | 56% | 2769 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 47,630 psi | 73% | 2972 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,862 psi | 72% | 2959 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,882 psi | 83% | 3022 fps | 100% |
| Hodgdon Retumbo | 68.2 gr | 80% | 37,971 psi | 58% | 2887 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 44% | 1841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,414 psi | 75% | 2963 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 44,077 psi | 68% | 2956 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,811 psi | 58% | 2818 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 39,595 psi | 61% | 2762 fps | 99.2% |
| Norma 217 | <<locked>> | 84% | 33,373 psi | 51% | 2717 fps | 96% |
| Norma MRP | <<locked>> | 80% | 49,023 psi | 75% | 3058 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 44,367 psi | 68% | 2969 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 40,016 psi | 62% | 2831 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 45% | 1880 fps | 100% |
| ReloadSwiss RS 76 | 73 gr | 80% | 37,463 psi | 58% | 2858 fps | 98.4% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 43,366 psi | 67% | 2959 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,517 psi | 78% | 3012 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 49,429 psi | 76% | 3022 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,081 psi | 76% | 3015 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 51,677 psi | 80% | 2999 fps | 98.5% |
| Somchem S385 | <<locked>> | 80% | 49,864 psi | 77% | 2992 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 43,758 psi | 67% | 2861 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 52,707 psi | 81% | 3054 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,400 psi | 76% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,544 psi | 75% | 3051 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 40,553 psi | 62% | 2851 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 44,309 psi | 68% | 2972 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 90% | 48,878 psi | 75% | 3107 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,874 psi | 68% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,079 psi | 71% | 2917 fps | 98.8% |
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 | 123gr | Lapua Scenar. Hodgdon Retumbo delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 2,054 fps to 3,314 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 123.0 gr projectile in 0.264" calls for a 1:9.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, ADI AR 2218 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 123gr | Lapua Scenar 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.