Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 139gr | Norma HP 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, 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>> | 84% | 57,246 psi | 88% | 2936 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,214 psi | 82% | 2972 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 82% | 56,492 psi | 87% | 3045 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 57,899 psi | 89% | 3018 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,043 psi | 88% | 3041 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 56,579 psi | 87% | 3028 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,203 psi | 88% | 3159 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 56,521 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,551 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,580 psi | 89% | 3035 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,811 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,869 psi | 88% | 3018 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,419 psi | 85% | 3064 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,680 psi | 86% | 3061 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,855 psi | 88% | 2999 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 57,029 psi | 88% | 3028 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,739 psi | 87% | 3041 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,580 psi | 89% | 3035 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,972 psi | 89% | 3048 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,434 psi | 85% | 2969 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,305 psi | 90% | 3015 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,710 psi | 87% | 3114 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,072 psi | 59% | 1942 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,463 psi | 85% | 2943 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 84% | 55,651 psi | 86% | 3025 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,740 psi | 89% | 2959 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,477 psi | 85% | 3038 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,709 psi | 86% | 2913 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,014 psi | 88% | 3058 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,740 psi | 89% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,276 psi | 88% | 3051 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,521 psi | 85% | 2976 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 60% | 1988 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,363 psi | 88% | 3094 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,405 psi | 87% | 3064 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 58,030 psi | 89% | 2989 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,566 psi | 89% | 3005 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2982 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,188 psi | 88% | 3002 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,580 psi | 89% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,899 psi | 89% | 2963 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,406 psi | 88% | 2995 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 57,464 psi | 88% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,971 psi | 88% | 3054 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,552 psi | 90% | 3054 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,811 psi | 87% | 3071 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 58,334 psi | 90% | 3136 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,305 psi | 88% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,493 psi | 88% | 2969 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% | 50,096 psi | 77% | 2825 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,934 psi | 71% | 2838 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 52,678 psi | 81% | 2979 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 54,157 psi | 83% | 2959 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,501 psi | 76% | 2910 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 37,217 psi | 57% | 2648 fps | 97% |
| ADI AR 2218 | 81.1 gr | 90% | 45,759 psi | 70% | 2927 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,548 psi | 53% | 2618 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,911 psi | 83% | 2949 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,241 psi | 77% | 2910 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,979 psi | 75% | 2831 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,163 psi | 66% | 2785 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 44,164 psi | 68% | 2844 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,585 psi | 69% | 2844 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,862 psi | 72% | 2815 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 46,920 psi | 72% | 2844 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 40,379 psi | 62% | 2726 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 50,241 psi | 77% | 2910 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,582 psi | 62% | 2730 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 51,851 psi | 80% | 2907 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,821 psi | 78% | 2887 fps | 99.2% |
| Hodgdon Retumbo | 68.1 gr | 80% | 42,467 psi | 65% | 2851 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 44% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,025 psi | 80% | 2887 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 48,414 psi | 75% | 2897 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,302 psi | 84% | 2900 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,461 psi | 53% | 2595 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 43,236 psi | 67% | 2700 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,677 psi | 50% | 2562 fps | 97.1% |
| Norma MRP | <<locked>> | 80% | 53,795 psi | 83% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,429 psi | 76% | 2920 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,411 psi | 68% | 2782 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,544 psi | 45% | 1781 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,061 psi | 65% | 2822 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,696 psi | 60% | 2710 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 54,360 psi | 84% | 2930 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,853 psi | 83% | 2946 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,892 psi | 74% | 2854 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,505 psi | 82% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,983 psi | 83% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,572 psi | 73% | 2792 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 50,053 psi | 77% | 2864 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 54,027 psi | 83% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,113 psi | 82% | 2986 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,643 psi | 69% | 2802 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 39,740 psi | 61% | 2730 fps | 95.6% |
| Vihtavuori N570 | 75.9 gr | 86% | 47,079 psi | 72% | 2923 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,313 psi | 76% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,053 psi | 77% | 2848 fps | 99.9% |
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 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 139gr | Norma HP. ADI AR 2218 delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,159 fps. Accurate 8700 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 59–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.264" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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 | 139gr | Norma HP 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.