Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Nosler RDF bullet and 51 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% | 56,347 psi | 87% | 2913 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,083 psi | 80% | 2949 fps | 97.3% |
| Accurate High Country | <<locked>> | 82% | 58,450 psi | 90% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 55,419 psi | 85% | 3018 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 57,188 psi | 88% | 2999 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,130 psi | 86% | 3018 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 55,579 psi | 86% | 3005 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,217 psi | 87% | 3133 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 94% | 55,230 psi | 85% | 3028 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,623 psi | 87% | 2986 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,724 psi | 87% | 3015 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 58,653 psi | 90% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,753 psi | 86% | 2995 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 58,276 psi | 90% | 3107 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 58,639 psi | 90% | 3104 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,028 psi | 86% | 2976 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 56,144 psi | 86% | 3005 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,709 psi | 86% | 3015 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,724 psi | 87% | 3015 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,927 psi | 88% | 3025 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 58,407 psi | 90% | 3009 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,479 psi | 88% | 2995 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,463 psi | 85% | 3087 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,130 psi | 59% | 1932 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 58,291 psi | 90% | 2982 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 58,668 psi | 90% | 3068 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,087 psi | 88% | 2936 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 98% | 58,204 psi | 90% | 3071 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 58,421 psi | 90% | 2946 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,956 psi | 86% | 3035 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,811 psi | 87% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,072 psi | 86% | 3028 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 58,784 psi | 90% | 3015 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 60% | 1975 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,246 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,259 psi | 85% | 3038 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 57,363 psi | 88% | 2969 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,608 psi | 87% | 2979 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,896 psi | 83% | 2959 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,246 psi | 87% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 58,711 psi | 90% | 2963 fps | 99.9% |
| Somchem S385 | <<locked>> | 82% | 56,898 psi | 88% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,101 psi | 88% | 2940 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,376 psi | 87% | 2969 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 56,681 psi | 87% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,086 psi | 86% | 3031 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 57,566 psi | 89% | 3031 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 55,622 psi | 86% | 3041 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 57,363 psi | 88% | 3114 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,159 psi | 86% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,681 psi | 87% | 2949 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% | 49,385 psi | 76% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,831 psi | 69% | 2808 fps | 95.2% |
| Accurate High Country | <<locked>> | 80% | 54,636 psi | 84% | 3015 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 51,793 psi | 80% | 2956 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 53,403 psi | 82% | 2940 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,776 psi | 75% | 2890 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 36,579 psi | 56% | 2628 fps | 96.8% |
| ADI AR 2218 | 79.6 gr | 90% | 45,005 psi | 69% | 2904 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 33,794 psi | 52% | 2595 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,214 psi | 82% | 2930 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,516 psi | 76% | 2890 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,211 psi | 74% | 2812 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,409 psi | 65% | 2766 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,279 psi | 67% | 2822 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 92% | 46,949 psi | 72% | 2887 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,166 psi | 71% | 2795 fps | 96.7% |
| Bofors RP15 | <<locked>> | 80% | 46,209 psi | 71% | 2825 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 39,682 psi | 61% | 2707 fps | 97.8% |
| Bofors RP5 | <<locked>> | 80% | 49,516 psi | 76% | 2890 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 39,726 psi | 61% | 2703 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 80% | 50,966 psi | 78% | 2884 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,183 psi | 77% | 2867 fps | 99.1% |
| Hodgdon Retumbo | 66.7 gr | 80% | 41,539 psi | 64% | 2825 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 44% | 1729 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,372 psi | 79% | 2864 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 47,688 psi | 73% | 2877 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,432 psi | 82% | 2874 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,794 psi | 52% | 2572 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 42,656 psi | 66% | 2680 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,995 psi | 49% | 2539 fps | 96.9% |
| Norma MRP | <<locked>> | 80% | 53,055 psi | 82% | 2966 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,443 psi | 75% | 2894 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 43,743 psi | 67% | 2762 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,443 psi | 45% | 1768 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,191 psi | 63% | 2802 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,956 psi | 58% | 2687 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 53,635 psi | 83% | 2907 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,098 psi | 82% | 2923 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,963 psi | 72% | 2831 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,750 psi | 81% | 2917 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 54,897 psi | 84% | 2900 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 53,272 psi | 82% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,876 psi | 72% | 2769 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 49,400 psi | 76% | 2844 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 53,185 psi | 82% | 2894 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,417 psi | 81% | 2966 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 43,976 psi | 68% | 2782 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 80% | 38,943 psi | 60% | 2703 fps | 95.3% |
| Vihtavuori N570 | 74.5 gr | 86% | 46,267 psi | 71% | 2904 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,472 psi | 75% | 2890 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,429 psi | 76% | 2828 fps | 99.8% |
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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Nosler RDF. ADI AR 2218 delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,133 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 | Nosler RDF 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.