Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 139gr | Norma Semi Soft Point bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-50.
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% | 57,551 psi | 89% | 2940 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,650 psi | 83% | 2982 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 82% | 56,797 psi | 87% | 3051 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 58,204 psi | 90% | 3025 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,334 psi | 88% | 3048 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,116 psi | 88% | 3038 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,682 psi | 89% | 3166 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 56,811 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,856 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,914 psi | 89% | 3038 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,130 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,174 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,651 psi | 86% | 3068 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,115 psi | 86% | 3064 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,261 psi | 88% | 3005 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 57,348 psi | 88% | 3031 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,058 psi | 88% | 3048 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,914 psi | 89% | 3038 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 58,508 psi | 90% | 3054 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,724 psi | 86% | 2972 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,595 psi | 90% | 3018 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,072 psi | 88% | 3117 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 59% | 1946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,724 psi | 86% | 2949 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 55,970 psi | 86% | 3031 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,160 psi | 90% | 2966 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,753 psi | 86% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,999 psi | 86% | 2917 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,522 psi | 89% | 3068 fps | 100% |
| Norma MRP | <<locked>> | 82% | 58,044 psi | 89% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,595 psi | 89% | 3058 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,072 psi | 86% | 2986 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 60% | 1988 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,899 psi | 89% | 3100 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,913 psi | 88% | 3071 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 58,320 psi | 90% | 2995 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,870 psi | 89% | 3009 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,463 psi | 85% | 2992 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,508 psi | 89% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,088 psi | 89% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,189 psi | 90% | 2966 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,624 psi | 89% | 2999 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 82% | 57,798 psi | 89% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,305 psi | 88% | 3058 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 55,129 psi | 85% | 2999 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 90% | 57,305 psi | 88% | 3077 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 90% | 54,752 psi | 84% | 3071 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,609 psi | 89% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,740 psi | 89% | 2972 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% | 50,401 psi | 78% | 2828 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 46,340 psi | 71% | 2844 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 80% | 52,953 psi | 81% | 2986 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 80% | 54,476 psi | 84% | 2966 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,806 psi | 77% | 2917 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 37,492 psi | 58% | 2657 fps | 97.2% |
| ADI AR 2218 | 79.8 gr | 88% | 42,917 psi | 66% | 2861 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,809 psi | 54% | 2628 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,215 psi | 83% | 2956 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,546 psi | 78% | 2917 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,327 psi | 76% | 2835 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,482 psi | 67% | 2789 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 44,599 psi | 69% | 2851 fps | 95.6% |
| Alliant Reloder-50 | 82.9 gr | 90% | 45,005 psi | 69% | 2848 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,079 psi | 72% | 2822 fps | 96.9% |
| Bofors RP15 | <<locked>> | 80% | 47,224 psi | 73% | 2854 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 40,669 psi | 63% | 2733 fps | 98% |
| Bofors RP5 | <<locked>> | 80% | 50,546 psi | 78% | 2917 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,857 psi | 63% | 2736 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 52,141 psi | 80% | 2913 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,111 psi | 79% | 2894 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,801 psi | 66% | 2854 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 44% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,301 psi | 80% | 2890 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 48,747 psi | 75% | 2904 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,520 psi | 84% | 2904 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,751 psi | 53% | 2602 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 43,555 psi | 67% | 2703 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,982 psi | 51% | 2569 fps | 97.2% |
| Norma MRP | <<locked>> | 80% | 54,331 psi | 84% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,748 psi | 77% | 2923 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,875 psi | 69% | 2789 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 45% | 1781 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,525 psi | 65% | 2831 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,146 psi | 60% | 2720 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 54,665 psi | 84% | 2933 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 54,157 psi | 83% | 2949 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 48,298 psi | 74% | 2861 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,809 psi | 83% | 2943 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,273 psi | 84% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,848 psi | 74% | 2795 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 47,152 psi | 73% | 2808 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 54,331 psi | 84% | 2920 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,635 psi | 83% | 2995 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 44,918 psi | 69% | 2808 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 40,016 psi | 62% | 2733 fps | 95.7% |
| Vihtavuori N570 | 74.6 gr | 84% | 44,193 psi | 68% | 2861 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,748 psi | 77% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,328 psi | 77% | 2851 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 Semi Soft Point. ADI AR 2218 delivers the highest muzzle velocity at 3,166 fps; across all powders the maximum-charge window runs from 1,946 fps to 3,166 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 139gr | Norma Semi Soft Point 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.