Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Barnes X S bullet and 39 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-50.
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>> | 82% | 57,522 psi | 89% | 2917 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,130 psi | 88% | 3025 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 82% | 56,217 psi | 87% | 3012 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 90% | 56,043 psi | 86% | 3002 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,623 psi | 87% | 3133 fps | 99% |
| ADI AR 2225 | <<locked>> | 92% | 56,275 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,188 psi | 88% | 3012 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,738 psi | 86% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,608 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,274 psi | 85% | 3045 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,405 psi | 87% | 3058 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,666 psi | 86% | 2963 fps | 98.7% |
| Bofors RP15 | <<locked>> | 84% | 56,666 psi | 87% | 3002 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,666 psi | 87% | 3022 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,188 psi | 88% | 3012 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,348 psi | 88% | 3022 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 58,305 psi | 90% | 2999 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,406 psi | 88% | 2982 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,449 psi | 87% | 3091 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,435 psi | 59% | 1936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,986 psi | 89% | 2969 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 82% | 55,071 psi | 85% | 2999 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,724 psi | 87% | 2923 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,869 psi | 86% | 3025 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 56,231 psi | 87% | 2900 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,551 psi | 89% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,579 psi | 87% | 3022 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 55,288 psi | 85% | 2953 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,479 psi | 61% | 1982 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,217 psi | 88% | 3077 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,521 psi | 87% | 3048 fps | 99.7% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 58,769 psi | 90% | 3031 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 84% | 57,348 psi | 88% | 2933 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,000 psi | 88% | 2972 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 86% | 58,537 psi | 90% | 3038 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,565 psi | 87% | 3048 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 90% | 58,233 psi | 90% | 3117 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,276 psi | 88% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,869 psi | 88% | 2940 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% | 53,998 psi | 83% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 46,325 psi | 71% | 2831 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 80% | 52,634 psi | 81% | 2949 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 40,263 psi | 62% | 2707 fps | 98.2% |
| ADI AR 2218 | 76.9 gr | 86% | 42,946 psi | 66% | 2848 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 37,898 psi | 58% | 2690 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,679 psi | 83% | 2953 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,489 psi | 81% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,673 psi | 72% | 2835 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 44,947 psi | 69% | 2848 fps | 96% |
| Alliant Reloder-50 | 79.9 gr | 88% | 46,064 psi | 71% | 2861 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,240 psi | 76% | 2848 fps | 97.5% |
| Bofors RP15 | <<locked>> | 80% | 50,111 psi | 77% | 2887 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 44,005 psi | 68% | 2789 fps | 98.9% |
| Bofors RP5 | <<locked>> | 80% | 53,679 psi | 83% | 2953 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,685 psi | 67% | 2779 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 80% | 54,665 psi | 84% | 2936 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,838 psi | 83% | 2923 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,890 psi | 71% | 2907 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,935 psi | 45% | 1732 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,694 psi | 84% | 2913 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 51,503 psi | 79% | 2936 fps | 99.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 53,461 psi | 82% | 2867 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,839 psi | 55% | 2618 fps | 96.5% |
| Lovex S071 | <<locked>> | 80% | 47,239 psi | 73% | 2749 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,564 psi | 56% | 2648 fps | 98.7% |
| Ramshot Grand | <<locked>> | 80% | 52,881 psi | 81% | 2963 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 48,008 psi | 74% | 2831 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,921 psi | 46% | 1775 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,861 psi | 71% | 2884 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,699 psi | 66% | 2785 fps | 97.4% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 45,585 psi | 70% | 2792 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 50,589 psi | 78% | 2825 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 47,224 psi | 73% | 2792 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 80% | 48,370 psi | 74% | 2858 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 80% | 43,410 psi | 67% | 2795 fps | 97.1% |
| Vihtavuori N570 | 71.8 gr | 82% | 44,498 psi | 68% | 2854 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,490 psi | 82% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,330 psi | 82% | 2884 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 39 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Barnes X S. ADI AR 2218 delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,133 fps. Accurate 8700 gives the best case fill at 100 %, and 39 of the 39 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 1:9.0 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-50 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Barnes X S 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.