Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Nosler Partition bullet and 49 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 Alliant Reloder-33.
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% | 57,508 psi | 89% | 2930 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,563 psi | 82% | 2972 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 82% | 56,521 psi | 87% | 3038 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 58,131 psi | 89% | 3015 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,058 psi | 88% | 3031 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,898 psi | 88% | 3025 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,551 psi | 89% | 3156 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 56,608 psi | 87% | 3045 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,740 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,638 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,014 psi | 86% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,913 psi | 88% | 3009 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,521 psi | 85% | 3058 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,825 psi | 86% | 3054 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,072 psi | 88% | 2995 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 57,290 psi | 88% | 3022 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,782 psi | 87% | 3031 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,638 psi | 89% | 3028 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 58,291 psi | 90% | 3041 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,637 psi | 86% | 2963 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,320 psi | 90% | 3005 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,768 psi | 87% | 3104 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,174 psi | 59% | 1939 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,666 psi | 86% | 2940 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 55,912 psi | 86% | 3022 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,943 psi | 89% | 2956 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,550 psi | 85% | 3028 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,912 psi | 86% | 2907 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,319 psi | 88% | 3054 fps | 100% |
| Norma MRP | <<locked>> | 82% | 58,001 psi | 89% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,305 psi | 88% | 3045 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,840 psi | 86% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,146 psi | 60% | 1982 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,682 psi | 89% | 3091 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,724 psi | 87% | 3061 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 58,233 psi | 90% | 2982 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,537 psi | 89% | 2995 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,143 psi | 85% | 2979 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,174 psi | 88% | 2992 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,783 psi | 89% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,146 psi | 89% | 2956 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,450 psi | 88% | 2989 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 82% | 57,696 psi | 89% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,217 psi | 88% | 3048 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 54,897 psi | 84% | 2986 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 90% | 57,116 psi | 88% | 3064 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 58,668 psi | 90% | 3133 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,537 psi | 89% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,725 psi | 89% | 2963 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% | 50,314 psi | 77% | 2818 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 46,035 psi | 71% | 2835 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 80% | 52,692 psi | 81% | 2969 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 80% | 54,346 psi | 84% | 2953 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,690 psi | 76% | 2907 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 37,231 psi | 57% | 2641 fps | 97.1% |
| ADI AR 2218 | 79.2 gr | 88% | 42,757 psi | 66% | 2848 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,737 psi | 53% | 2618 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,114 psi | 83% | 2943 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,459 psi | 78% | 2907 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,197 psi | 76% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,381 psi | 67% | 2779 fps | 100% |
| Alliant Reloder-33 | 78.8 gr | 86% | 44,411 psi | 68% | 2841 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,672 psi | 69% | 2835 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,021 psi | 72% | 2812 fps | 96.9% |
| Bofors RP15 | <<locked>> | 80% | 46,920 psi | 72% | 2838 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 40,567 psi | 62% | 2723 fps | 98.1% |
| Bofors RP5 | <<locked>> | 80% | 50,459 psi | 78% | 2907 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,611 psi | 63% | 2723 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 52,040 psi | 80% | 2900 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,039 psi | 79% | 2884 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,699 psi | 66% | 2844 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,703 psi | 44% | 1732 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,199 psi | 80% | 2877 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 48,646 psi | 75% | 2890 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,302 psi | 84% | 2890 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,621 psi | 53% | 2592 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 43,410 psi | 67% | 2694 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,866 psi | 51% | 2556 fps | 97.2% |
| Norma MRP | <<locked>> | 80% | 54,041 psi | 83% | 2979 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,458 psi | 76% | 2913 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,614 psi | 69% | 2779 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,457 psi | 45% | 1775 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,279 psi | 65% | 2818 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,914 psi | 60% | 2707 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 54,549 psi | 84% | 2923 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 54,041 psi | 83% | 2936 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 48,182 psi | 74% | 2851 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,693 psi | 83% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,186 psi | 83% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,718 psi | 73% | 2785 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,920 psi | 72% | 2795 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 54,201 psi | 83% | 2907 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,316 psi | 82% | 2979 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 44,817 psi | 69% | 2799 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 80% | 39,929 psi | 61% | 2723 fps | 95.8% |
| Vihtavuori N570 | 74 gr | 84% | 43,976 psi | 68% | 2848 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,603 psi | 76% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,270 psi | 77% | 2841 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 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Nosler Partition. ADI AR 2218 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,156 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 1:9.5 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, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Nosler Partition 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.