Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Speer Impact bullet and 50 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% | 56,782 psi | 87% | 2920 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 2959 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 82% | 55,840 psi | 86% | 3028 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 57,653 psi | 89% | 3009 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,579 psi | 87% | 3025 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 55,970 psi | 86% | 3012 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,768 psi | 87% | 3143 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 55,912 psi | 86% | 3035 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,624 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,058 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,116 psi | 88% | 3018 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,521 psi | 85% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,188 psi | 86% | 2999 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,679 psi | 84% | 3045 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,013 psi | 85% | 3041 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,550 psi | 87% | 2986 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 56,565 psi | 87% | 3009 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,130 psi | 86% | 3025 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,116 psi | 88% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,363 psi | 88% | 3031 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 58,798 psi | 90% | 3015 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,899 psi | 89% | 3002 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,970 psi | 86% | 3094 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 59% | 1936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 58,668 psi | 90% | 2989 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,158 psi | 85% | 3009 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,421 psi | 88% | 2943 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 58,595 psi | 90% | 3077 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,230 psi | 85% | 2897 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,405 psi | 87% | 3041 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,261 psi | 88% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,536 psi | 87% | 3031 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,940 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,131 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,724 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,869 psi | 86% | 3051 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 57,769 psi | 89% | 2976 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,058 psi | 88% | 2989 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,418 psi | 84% | 2966 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,695 psi | 87% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,319 psi | 88% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,493 psi | 88% | 2946 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,913 psi | 88% | 2979 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 57,145 psi | 88% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,521 psi | 87% | 3038 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 57,972 psi | 89% | 3038 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,246 psi | 87% | 3051 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 57,754 psi | 89% | 3120 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,681 psi | 87% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,087 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% | 49,792 psi | 77% | 2812 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,353 psi | 70% | 2822 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 52,228 psi | 80% | 2963 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 53,867 psi | 83% | 2946 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,182 psi | 76% | 2897 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 36,782 psi | 57% | 2635 fps | 96.9% |
| ADI AR 2218 | 80.1 gr | 90% | 45,295 psi | 70% | 2910 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,156 psi | 53% | 2605 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 54,157 psi | 83% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,635 psi | 83% | 2936 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,937 psi | 77% | 2897 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,646 psi | 75% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,859 psi | 66% | 2772 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,816 psi | 67% | 2831 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,282 psi | 73% | 2894 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,499 psi | 72% | 2802 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 46,427 psi | 71% | 2828 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 40,059 psi | 62% | 2713 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 49,937 psi | 77% | 2897 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,132 psi | 62% | 2713 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,401 psi | 79% | 2890 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,560 psi | 78% | 2877 fps | 99.2% |
| Hodgdon Retumbo | 67.2 gr | 80% | 41,974 psi | 65% | 2835 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 44% | 1729 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,750 psi | 80% | 2874 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 47,921 psi | 74% | 2881 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,766 psi | 83% | 2881 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,040 psi | 52% | 2579 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 42,902 psi | 66% | 2684 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,242 psi | 50% | 2546 fps | 97% |
| Norma MRP | <<locked>> | 80% | 53,519 psi | 82% | 2972 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,921 psi | 75% | 2904 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,164 psi | 68% | 2772 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,515 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,611 psi | 64% | 2808 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,319 psi | 59% | 2697 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 54,070 psi | 83% | 2917 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,316 psi | 82% | 2927 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,471 psi | 73% | 2838 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,968 psi | 82% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,693 psi | 83% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,282 psi | 73% | 2779 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 49,734 psi | 77% | 2851 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 53,447 psi | 82% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,866 psi | 81% | 2976 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,353 psi | 68% | 2789 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 39,334 psi | 61% | 2713 fps | 95.5% |
| Vihtavuori N570 | 75 gr | 86% | 46,659 psi | 72% | 2907 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,776 psi | 75% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,806 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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Speer Impact. ADI AR 2218 delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,143 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Speer Impact 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.