Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 123gr | Nosler Custom Competition bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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% | 56,594 psi | 87% | 3084 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,824 psi | 84% | 3179 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 84% | 55,854 psi | 86% | 3189 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 84% | 57,537 psi | 89% | 3173 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,275 psi | 87% | 3186 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 94% | 55,521 psi | 85% | 3169 fps | 99.7% |
| ADI AR 2218 | <<locked>> | 98% | 56,246 psi | 87% | 3284 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 96% | 54,824 psi | 84% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,130 psi | 88% | 3163 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,782 psi | 87% | 3182 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 58,798 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,622 psi | 86% | 3163 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,811 psi | 86% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,102 psi | 89% | 3258 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,320 psi | 90% | 3251 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,637 psi | 87% | 3143 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 56,231 psi | 87% | 3173 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 55,651 psi | 86% | 3179 fps | 99.7% |
| Bofors RP5 | <<locked>> | 86% | 56,782 psi | 87% | 3182 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 56,927 psi | 88% | 3189 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 55,230 psi | 85% | 3120 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,856 psi | 89% | 3163 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,769 psi | 89% | 3077 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,100 psi | 85% | 3255 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 58% | 2054 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,332 psi | 85% | 3094 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 86% | 54,969 psi | 85% | 3169 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,841 psi | 89% | 3228 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 58,639 psi | 90% | 3117 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,230 psi | 85% | 3189 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,188 psi | 88% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,246 psi | 87% | 3196 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 88% | 54,679 psi | 84% | 3117 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,914 psi | 60% | 2103 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,912 psi | 86% | 3235 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,129 psi | 85% | 3196 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 84% | 57,914 psi | 89% | 3143 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 57,101 psi | 88% | 3159 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,710 psi | 87% | 3153 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,666 psi | 86% | 3071 fps | 99.1% |
| Somchem S385 | <<locked>> | 84% | 57,319 psi | 88% | 3123 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,348 psi | 88% | 3107 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,869 psi | 88% | 3130 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 56,797 psi | 87% | 3120 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,521 psi | 87% | 3202 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 57,609 psi | 89% | 3196 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 92% | 55,608 psi | 86% | 3199 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 94% | 57,101 psi | 88% | 3264 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,637 psi | 86% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,217 psi | 88% | 3120 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% | 46,325 psi | 71% | 2904 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 51,097 psi | 79% | 3110 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 48,327 psi | 74% | 3045 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 50,299 psi | 77% | 3045 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 45,730 psi | 70% | 2986 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 36,550 psi | 56% | 2762 fps | 95.2% |
| ADI AR 2218 | 85.6 gr | 94% | 48,312 psi | 74% | 3117 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 31,430 psi | 48% | 2654 fps | 96% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,183 psi | 77% | 3038 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,514 psi | 72% | 2989 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,121 psi | 69% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,276 psi | 60% | 2851 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,663 psi | 80% | 3107 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 49,995 psi | 77% | 3107 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,154 psi | 77% | 3097 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,543 psi | 72% | 2946 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 43,265 psi | 67% | 2917 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 36,767 psi | 57% | 2779 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 46,514 psi | 72% | 2989 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 37,086 psi | 57% | 2779 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 48,095 psi | 74% | 2982 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,355 psi | 73% | 2969 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,244 psi | 83% | 3025 fps | 100% |
| Hodgdon Retumbo | 68.8 gr | 80% | 38,479 psi | 59% | 2900 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 44% | 1844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,704 psi | 75% | 2969 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 44,440 psi | 68% | 2963 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 38,290 psi | 59% | 2828 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 39,958 psi | 61% | 2772 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 31,444 psi | 48% | 2657 fps | 95% |
| Norma MRP | <<locked>> | 80% | 49,574 psi | 76% | 3064 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 44,918 psi | 69% | 2979 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 40,509 psi | 62% | 2841 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 45% | 1886 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,927 psi | 58% | 2867 fps | 98.6% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 40,698 psi | 63% | 2894 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,807 psi | 78% | 3015 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 49,951 psi | 77% | 3028 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,603 psi | 76% | 3025 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 52,112 psi | 80% | 3009 fps | 98.6% |
| Somchem S385 | <<locked>> | 80% | 50,401 psi | 78% | 3002 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 44,063 psi | 68% | 2867 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 53,098 psi | 82% | 3061 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 49,980 psi | 77% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,066 psi | 76% | 3061 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,017 psi | 63% | 2861 fps | 96.1% |
| Vihtavuori N568 | <<locked>> | 86% | 44,788 psi | 69% | 2982 fps | 96% |
| Vihtavuori N570 | 80.3 gr | 90% | 49,342 psi | 76% | 3117 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,295 psi | 68% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,557 psi | 72% | 2927 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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 123gr | Nosler Custom Competition. ADI AR 2218 delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 2,054 fps to 3,284 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 50 of the 50 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 1:10.5 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 123gr | Nosler Custom Competition 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.