Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Berger Elite Hunter bullet and 50 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% | 56,637 psi | 87% | 2920 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,475 psi | 81% | 2956 fps | 97.4% |
| Accurate High Country | <<locked>> | 82% | 58,755 psi | 90% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 55,898 psi | 86% | 3028 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 57,493 psi | 88% | 3005 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,434 psi | 87% | 3025 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 56,072 psi | 86% | 3012 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,623 psi | 87% | 3140 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 55,753 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,130 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,000 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,361 psi | 85% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,275 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 58,726 psi | 90% | 3114 fps | 98.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,868 psi | 84% | 3038 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,449 psi | 87% | 2986 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 56,434 psi | 87% | 3009 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,999 psi | 86% | 3025 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,000 psi | 88% | 3022 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,450 psi | 88% | 3031 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,056 psi | 85% | 2956 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,769 psi | 89% | 2999 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,043 psi | 86% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1932 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 58,755 psi | 90% | 2989 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,042 psi | 85% | 3009 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,305 psi | 88% | 2943 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 58,436 psi | 90% | 3077 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,317 psi | 85% | 2900 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,246 psi | 87% | 3038 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,145 psi | 88% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,637 psi | 87% | 3035 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,013 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,811 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,724 psi | 86% | 3048 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 57,624 psi | 89% | 2972 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,898 psi | 88% | 2989 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,317 psi | 84% | 2966 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,536 psi | 87% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,203 psi | 88% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,363 psi | 88% | 2946 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,768 psi | 87% | 2976 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 57,000 psi | 88% | 2949 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,391 psi | 87% | 3038 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,044 psi | 89% | 3038 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,115 psi | 86% | 3051 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 57,841 psi | 89% | 3123 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,536 psi | 87% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,956 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% | 49,676 psi | 76% | 2808 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,223 psi | 70% | 2818 fps | 95.4% |
| Accurate High Country | <<locked>> | 80% | 54,926 psi | 85% | 3018 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 52,098 psi | 80% | 2963 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 53,708 psi | 83% | 2943 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,052 psi | 75% | 2897 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 36,840 psi | 57% | 2635 fps | 96.9% |
| ADI AR 2218 | 80 gr | 90% | 45,179 psi | 70% | 2910 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,200 psi | 53% | 2605 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,490 psi | 82% | 2936 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,821 psi | 77% | 2897 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,530 psi | 75% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,714 psi | 66% | 2769 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,700 psi | 67% | 2831 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,355 psi | 73% | 2897 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,383 psi | 71% | 2799 fps | 96.7% |
| Bofors RP15 | <<locked>> | 80% | 46,499 psi | 72% | 2831 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 39,958 psi | 61% | 2713 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 49,821 psi | 77% | 2897 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,030 psi | 62% | 2710 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,459 psi | 79% | 2890 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,444 psi | 78% | 2874 fps | 99.2% |
| Hodgdon Retumbo | 67.2 gr | 80% | 42,018 psi | 65% | 2835 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,616 psi | 44% | 1729 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,634 psi | 79% | 2871 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 47,979 psi | 74% | 2881 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,824 psi | 83% | 2884 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,084 psi | 52% | 2582 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 42,960 psi | 66% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,285 psi | 50% | 2549 fps | 97% |
| Norma MRP | <<locked>> | 80% | 53,359 psi | 82% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,776 psi | 75% | 2900 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 44,034 psi | 68% | 2769 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,385 psi | 45% | 1768 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,669 psi | 64% | 2812 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,363 psi | 59% | 2697 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 54,143 psi | 83% | 2917 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,403 psi | 82% | 2930 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,355 psi | 73% | 2838 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,040 psi | 82% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,577 psi | 82% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,181 psi | 73% | 2776 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 49,632 psi | 76% | 2851 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 53,519 psi | 82% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,707 psi | 81% | 2972 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,251 psi | 68% | 2785 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 39,363 psi | 61% | 2713 fps | 95.5% |
| Vihtavuori N570 | 74.9 gr | 86% | 46,543 psi | 72% | 2907 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,834 psi | 75% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,705 psi | 76% | 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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Berger Elite Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,140 fps. Accurate 8700 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 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, 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Berger Elite Hunter 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.