Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | RWS Doppelkern bullet and 42 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% | 58,784 psi | 90% | 2949 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 2995 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 82% | 58,030 psi | 89% | 3061 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 58,610 psi | 90% | 3058 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 58,392 psi | 90% | 3045 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,085 psi | 85% | 3107 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 94% | 58,334 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,230 psi | 85% | 2989 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,421 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 58,508 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,261 psi | 88% | 3084 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 57,711 psi | 89% | 3081 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 58,218 psi | 90% | 3015 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 58,552 psi | 90% | 3041 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 58,494 psi | 90% | 3058 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,230 psi | 85% | 2989 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,796 psi | 86% | 3005 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,869 psi | 88% | 2986 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,811 psi | 86% | 2966 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 58,537 psi | 90% | 3130 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 59% | 1946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,811 psi | 87% | 2959 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 57,276 psi | 88% | 3041 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,477 psi | 85% | 2913 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,203 psi | 88% | 3051 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 57,217 psi | 88% | 2927 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,201 psi | 85% | 3018 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 54,766 psi | 84% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 57,305 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,291 psi | 60% | 1991 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,071 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,334 psi | 90% | 3084 fps | 99.8% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3005 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,552 psi | 90% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 55,666 psi | 86% | 2920 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,013 psi | 85% | 2946 fps | 97.2% |
| Vihtavuori N560 | <<locked>> | 82% | 58,508 psi | 90% | 3068 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 56,347 psi | 87% | 3009 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 58,740 psi | 90% | 3091 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 56,217 psi | 87% | 3087 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,172 psi | 85% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,187 psi | 85% | 2923 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% | 51,401 psi | 79% | 2835 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 44,193 psi | 68% | 2792 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 54,186 psi | 83% | 2995 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 51,024 psi | 79% | 2930 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 38,363 psi | 59% | 2667 fps | 97.6% |
| ADI AR 2218 | 81 gr | 88% | 44,063 psi | 68% | 2881 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 35,679 psi | 55% | 2638 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,750 psi | 80% | 2927 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,372 psi | 78% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,512 psi | 69% | 2799 fps | 100% |
| Alliant Reloder-33 | 78.7 gr | 84% | 42,525 psi | 65% | 2795 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 90% | 46,311 psi | 71% | 2864 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,037 psi | 74% | 2831 fps | 97.3% |
| Bofors RP15 | <<locked>> | 80% | 48,211 psi | 74% | 2861 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 41,655 psi | 64% | 2743 fps | 98.4% |
| Bofors RP5 | <<locked>> | 80% | 51,750 psi | 80% | 2927 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,814 psi | 64% | 2746 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 53,084 psi | 82% | 2920 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,257 psi | 80% | 2907 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,947 psi | 68% | 2867 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 44% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,156 psi | 82% | 2897 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 49,806 psi | 77% | 2910 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 86% | 52,040 psi | 80% | 2854 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 33,243 psi | 51% | 2552 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 44,498 psi | 68% | 2713 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,924 psi | 52% | 2582 fps | 97.7% |
| Ramshot Grand | <<locked>> | 80% | 50,879 psi | 78% | 2936 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 45,876 psi | 71% | 2799 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,486 psi | 45% | 1778 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,801 psi | 67% | 2844 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 40,234 psi | 62% | 2733 fps | 96.5% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 46,325 psi | 71% | 2812 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,853 psi | 84% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,747 psi | 75% | 2802 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 48,109 psi | 74% | 2822 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 80% | 54,621 psi | 84% | 3002 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 46,050 psi | 71% | 2818 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 41,133 psi | 63% | 2749 fps | 96.3% |
| Vihtavuori N570 | 75.7 gr | 84% | 45,353 psi | 70% | 2874 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,213 psi | 79% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,488 psi | 79% | 2864 fps | 100% |
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 42 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | RWS Doppelkern. Hodgdon Retumbo delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,946 fps to 3,130 fps. Accurate 8700 gives the best case fill at 100 %, and 42 of the 42 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 1:11.5 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 | RWS Doppelkern 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.