Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:140 gr
Bullet Diameter:0.264"
Bullet Length:<<locked>>
Caliber:6.5-300 Weatherby Mag. load data
Case Length (l3):2.825"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:99.5 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:64,977 psi
Recommended Twist Rate:1:8.5
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Berger BT Target bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 56,753 psi | 87% | 2920 fps | 100% |
| Accurate 3100 | <<locked>> | 84% | 56,797 psi | 87% | 2923 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,344 psi | 81% | 2956 fps | 97.4% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,794 psi | 81% | 2963 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 82% | 55,796 psi | 86% | 3028 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 82% | 56,101 psi | 86% | 3031 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 57,377 psi | 88% | 3002 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 57,667 psi | 89% | 3009 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,304 psi | 87% | 3025 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 56,608 psi | 87% | 3028 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 55,912 psi | 86% | 3012 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,202 psi | 86% | 3015 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,550 psi | 87% | 3140 fps | 99% |
| ADI AR 2218 | <<locked>> | 96% | 56,753 psi | 87% | 3143 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 55,651 psi | 86% | 3035 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 55,941 psi | 86% | 3038 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,885 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,029 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,305 psi | 88% | 2999 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,159 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,840 psi | 87% | 3018 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,245 psi | 85% | 2920 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,535 psi | 85% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,173 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,434 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,447 psi | 84% | 3041 fps | 98.2% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,911 psi | 85% | 3048 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,737 psi | 84% | 3038 fps | 97.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,984 psi | 85% | 3041 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,565 psi | 87% | 2989 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,333 psi | 87% | 2982 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 56,536 psi | 87% | 3012 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 56,594 psi | 87% | 3012 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,101 psi | 86% | 3025 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,347 psi | 87% | 3028 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,159 psi | 88% | 3022 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,840 psi | 87% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,319 psi | 88% | 3031 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,595 psi | 89% | 3035 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 58,784 psi | 90% | 3015 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 82% | 55,201 psi | 85% | 2959 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,609 psi | 89% | 2995 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,914 psi | 89% | 3002 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,927 psi | 86% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,217 psi | 87% | 3100 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,058 psi | 59% | 1932 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,058 psi | 59% | 1936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 58,653 psi | 90% | 2989 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,216 psi | 85% | 2933 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 84% | 55,216 psi | 85% | 3012 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,129 psi | 85% | 3009 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,406 psi | 88% | 2943 fps | 96.1% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,406 psi | 88% | 2946 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 58,552 psi | 90% | 3077 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,911 psi | 85% | 3018 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 58,769 psi | 90% | 2949 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,477 psi | 85% | 2900 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,333 psi | 87% | 3041 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,652 psi | 87% | 3048 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,246 psi | 88% | 3031 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,305 psi | 88% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,463 psi | 87% | 3035 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,811 psi | 87% | 3038 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,911 psi | 85% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,158 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 60% | 1982 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,666 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,971 psi | 88% | 3084 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,622 psi | 86% | 3048 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,101 psi | 86% | 3054 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 57,493 psi | 88% | 2972 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 57,798 psi | 89% | 2976 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,985 psi | 88% | 2986 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,072 psi | 88% | 2989 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,186 psi | 83% | 2966 fps | 97.4% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,621 psi | 84% | 2972 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,637 psi | 87% | 2986 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,710 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,072 psi | 88% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,363 psi | 88% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,508 psi | 89% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,232 psi | 88% | 2943 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,681 psi | 87% | 2976 fps | 97.4% |
| Vihtavuori N170 | <<locked>> | 90% | 56,913 psi | 88% | 2979 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 57,087 psi | 88% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 82% | 57,188 psi | 88% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,478 psi | 87% | 3038 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 56,550 psi | 87% | 3038 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,189 psi | 90% | 3041 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 57,943 psi | 89% | 3038 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 55,999 psi | 86% | 3048 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 90% | 56,260 psi | 87% | 3054 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 57,711 psi | 89% | 3120 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 92% | 57,986 psi | 89% | 3123 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,768 psi | 87% | 3018 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,594 psi | 87% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,101 psi | 88% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,058 psi | 88% | 2953 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% | 49,530 psi | 76% | 2808 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 49,850 psi | 77% | 2812 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,310 psi | 70% | 2822 fps | 95.4% |
| Accurate 8700 | <<locked>> | 96% | 45,527 psi | 70% | 2825 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 51,967 psi | 80% | 2959 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 52,243 psi | 80% | 2963 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 53,780 psi | 83% | 2946 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 53,882 psi | 83% | 2946 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,153 psi | 76% | 2897 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 49,226 psi | 76% | 2900 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 36,753 psi | 57% | 2631 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 80% | 36,985 psi | 57% | 2638 fps | 97% |
| ADI AR 2218 | 80.3 gr | 90% | 45,281 psi | 70% | 2913 fps | 96.1% |
| ADI AR 2218 | 80.3 gr | 90% | 45,484 psi | 70% | 2917 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,098 psi | 52% | 2605 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 80% | 34,345 psi | 53% | 2608 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 54,172 psi | 83% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,388 psi | 82% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,664 psi | 83% | 2940 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,966 psi | 77% | 2900 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,908 psi | 77% | 2897 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,617 psi | 75% | 2818 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,675 psi | 75% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,786 psi | 66% | 2769 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,888 psi | 66% | 2772 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,598 psi | 67% | 2828 fps | 95.4% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,830 psi | 67% | 2835 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,253 psi | 73% | 2897 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,514 psi | 73% | 2900 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,514 psi | 72% | 2802 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,456 psi | 71% | 2802 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 46,398 psi | 71% | 2831 fps | 99.5% |
| Bofors RP15 | <<locked>> | 80% | 46,644 psi | 72% | 2835 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 39,856 psi | 61% | 2710 fps | 97.8% |
| Bofors RP30 | <<locked>> | 80% | 40,132 psi | 62% | 2717 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 49,966 psi | 77% | 2900 fps | 99.9% |
| Bofors RP5 | <<locked>> | 80% | 49,908 psi | 77% | 2897 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,089 psi | 62% | 2713 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 40,176 psi | 62% | 2713 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,329 psi | 79% | 2890 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 80% | 51,619 psi | 79% | 2897 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,517 psi | 78% | 2874 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,604 psi | 78% | 2877 fps | 99.2% |
| Hodgdon Retumbo | 67.4 gr | 80% | 41,916 psi | 65% | 2835 fps | 99.6% |
| Hodgdon Retumbo | 67.4 gr | 80% | 42,206 psi | 65% | 2841 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 44% | 1729 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 44% | 1732 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,706 psi | 80% | 2871 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,793 psi | 80% | 2874 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 48,153 psi | 74% | 2884 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 47,863 psi | 74% | 2881 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,722 psi | 83% | 2881 fps | 95.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,969 psi | 83% | 2887 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,968 psi | 52% | 2579 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,200 psi | 53% | 2585 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 42,844 psi | 66% | 2684 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 42,946 psi | 66% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,169 psi | 50% | 2543 fps | 97% |
| Norma 217 | <<locked>> | 80% | 32,416 psi | 50% | 2552 fps | 97.1% |
| Norma MRP | <<locked>> | 80% | 53,243 psi | 82% | 2966 fps | 100% |
| Norma MRP | <<locked>> | 80% | 53,534 psi | 82% | 2972 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,863 psi | 75% | 2904 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 48,965 psi | 75% | 2904 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 43,903 psi | 68% | 2766 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 44,193 psi | 68% | 2772 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,443 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 45% | 1768 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,553 psi | 64% | 2808 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,829 psi | 64% | 2812 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,247 psi | 59% | 2694 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,522 psi | 59% | 2700 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 54,041 psi | 83% | 2917 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 80% | 54,085 psi | 83% | 2917 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,287 psi | 82% | 2927 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 53,563 psi | 82% | 2930 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,282 psi | 73% | 2835 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,471 psi | 73% | 2841 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,939 psi | 81% | 2923 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,229 psi | 82% | 2930 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,664 psi | 83% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,708 psi | 83% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,297 psi | 73% | 2779 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 47,050 psi | 72% | 2776 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 49,719 psi | 77% | 2851 fps | 95.8% |
| Vihtavuori N170 | <<locked>> | 86% | 49,734 psi | 77% | 2851 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 53,417 psi | 82% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 53,708 psi | 83% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,605 psi | 81% | 2969 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 80% | 52,866 psi | 81% | 2976 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,396 psi | 68% | 2789 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 44,135 psi | 68% | 2785 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 39,291 psi | 60% | 2713 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 80% | 39,537 psi | 61% | 2720 fps | 95.6% |
| Vihtavuori N570 | 75.1 gr | 86% | 46,630 psi | 72% | 2910 fps | 95.9% |
| Vihtavuori N570 | 75.1 gr | 86% | 46,702 psi | 72% | 2913 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,052 psi | 75% | 2900 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,704 psi | 75% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,835 psi | 77% | 2838 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,777 psi | 77% | 2835 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 99 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Berger BT Target. ADI AR 2218 delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,143 fps. Accurate 8700 gives the best case fill at 100 %, and 99 of the 99 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 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Accurate 8700, Hodgdon TrailBoss 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Berger BT Target 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.