Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Speer Deep Curl Soft Point bullet and 46 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 IMR 8133 Enduron.
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% | 58,146 psi | 89% | 2940 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,375 psi | 84% | 2986 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 82% | 57,377 psi | 88% | 3051 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 84% | 57,943 psi | 89% | 3048 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,740 psi | 89% | 3035 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 58,755 psi | 90% | 3173 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 57,653 psi | 89% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 58,392 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 58,494 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,971 psi | 88% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,827 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,695 psi | 87% | 3074 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,927 psi | 88% | 3071 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,725 psi | 89% | 3005 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 57,928 psi | 89% | 3031 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,885 psi | 89% | 3048 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 58,494 psi | 90% | 3041 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,143 psi | 85% | 2992 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,260 psi | 87% | 2972 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,390 psi | 85% | 2959 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 58,001 psi | 89% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 59% | 1942 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,217 psi | 87% | 2949 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 56,565 psi | 87% | 3031 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,639 psi | 90% | 2966 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,594 psi | 87% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,811 psi | 87% | 2920 fps | 100% |
| Norma 217 | <<locked>> | 96% | 58,421 psi | 90% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,262 psi | 90% | 3058 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,666 psi | 87% | 2982 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,189 psi | 60% | 1985 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,404 psi | 84% | 3035 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,769 psi | 89% | 3074 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 58,450 psi | 90% | 3009 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,173 psi | 86% | 2995 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,117 psi | 89% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,639 psi | 90% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,711 psi | 90% | 2966 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 58,305 psi | 90% | 3002 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 82% | 58,407 psi | 90% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 58,102 psi | 89% | 3064 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 55,724 psi | 86% | 2999 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 57,899 psi | 89% | 3077 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 90% | 55,608 psi | 86% | 3081 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 58,639 psi | 90% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 58,537 psi | 90% | 2976 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% | 50,952 psi | 78% | 2828 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 47,079 psi | 72% | 2851 fps | 96.1% |
| Accurate MAGPRO | <<locked>> | 80% | 53,534 psi | 82% | 2986 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 50,372 psi | 78% | 2920 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 37,985 psi | 58% | 2661 fps | 97.4% |
| ADI AR 2218 | 80.3 gr | 88% | 43,555 psi | 67% | 2867 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 35,288 psi | 54% | 2631 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,752 psi | 84% | 2956 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,097 psi | 79% | 2917 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,908 psi | 77% | 2835 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,063 psi | 68% | 2792 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 45,324 psi | 70% | 2858 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 90% | 45,585 psi | 70% | 2854 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,529 psi | 73% | 2822 fps | 97.1% |
| Bofors RP15 | <<locked>> | 80% | 47,776 psi | 74% | 2854 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 41,191 psi | 63% | 2733 fps | 98.2% |
| Bofors RP5 | <<locked>> | 80% | 51,097 psi | 79% | 2917 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 41,379 psi | 64% | 2736 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 80% | 52,649 psi | 81% | 2913 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,648 psi | 79% | 2894 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,424 psi | 67% | 2861 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 44% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,779 psi | 81% | 2890 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 49,356 psi | 76% | 2904 fps | 99.4% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,984 psi | 85% | 2904 fps | 95.7% |
| IMR 8133 Enduron | 68.7 gr | 82% | 35,244 psi | 54% | 2605 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 44,048 psi | 68% | 2703 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,504 psi | 52% | 2572 fps | 97.5% |
| Ramshot Grand | <<locked>> | 80% | 50,372 psi | 78% | 2927 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 45,440 psi | 70% | 2792 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 45% | 1778 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,163 psi | 66% | 2835 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,682 psi | 61% | 2723 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 54,723 psi | 84% | 2949 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,672 psi | 70% | 2802 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,404 psi | 84% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,795 psi | 84% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,356 psi | 74% | 2799 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 47,790 psi | 74% | 2812 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 54,940 psi | 85% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 54,201 psi | 83% | 2995 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 45,614 psi | 70% | 2812 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 40,712 psi | 63% | 2740 fps | 96.1% |
| Vihtavuori N570 | 75.1 gr | 84% | 44,947 psi | 69% | 2867 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,430 psi | 78% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,068 psi | 79% | 2858 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 46 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Speer Deep Curl Soft Point. ADI AR 2218 delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,173 fps. Accurate 8700 gives the best case fill at 100 %, and 46 of the 46 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 140.0 gr projectile in 0.264" calls for a 1:10.5 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, IMR 8133 Enduron rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Speer Deep Curl 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.