Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .263 | 150gr | Rhino Solid Shank bullet and 41 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% | 56,101 psi | 86% | 2822 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 2943 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 82% | 55,941 psi | 86% | 2927 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 55,767 psi | 86% | 2920 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,637 psi | 87% | 3054 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 92% | 55,869 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,536 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 58,740 psi | 90% | 2877 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,101 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 58,784 psi | 90% | 3025 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 54,955 psi | 85% | 2956 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,622 psi | 86% | 2887 fps | 99.1% |
| Bofors RP15 | <<locked>> | 84% | 55,999 psi | 86% | 2913 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,028 psi | 86% | 2933 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,536 psi | 87% | 2920 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,116 psi | 88% | 2936 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 57,943 psi | 89% | 2913 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,029 psi | 88% | 2900 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,202 psi | 86% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,203 psi | 59% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,667 psi | 89% | 2887 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 58,523 psi | 90% | 2972 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,623 psi | 87% | 2854 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 58,639 psi | 90% | 2989 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 58,131 psi | 89% | 2907 fps | 96% |
| Lovex S071 | <<locked>> | 88% | 58,320 psi | 90% | 2854 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,608 psi | 87% | 2953 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,130 psi | 86% | 2936 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 58,726 psi | 90% | 2923 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,392 psi | 61% | 1923 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,768 psi | 87% | 2982 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,608 psi | 86% | 2956 fps | 99.9% |
| Shooters World 50 BMG | <<locked>> | 92% | 58,131 psi | 89% | 2907 fps | 96% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 58,218 psi | 90% | 2949 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 84% | 56,753 psi | 87% | 2848 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,304 psi | 87% | 2890 fps | 98% |
| Vihtavuori N565 | <<locked>> | 86% | 57,551 psi | 89% | 2943 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,086 psi | 86% | 2963 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 57,667 psi | 89% | 3028 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,695 psi | 87% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,260 psi | 87% | 2854 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% | 52,489 psi | 81% | 2769 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 42,293 psi | 65% | 2680 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 80% | 52,199 psi | 80% | 2867 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 39,305 psi | 60% | 2618 fps | 98.4% |
| ADI AR 2218 | 77 gr | 86% | 41,989 psi | 65% | 2759 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 36,680 psi | 56% | 2589 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,910 psi | 81% | 2861 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,590 psi | 79% | 2776 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,803 psi | 70% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 40,669 psi | 63% | 2680 fps | 95.2% |
| Alliant Reloder-50 | 80 gr | 88% | 44,251 psi | 68% | 2749 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,936 psi | 75% | 2769 fps | 98% |
| Bofors RP15 | <<locked>> | 80% | 49,240 psi | 76% | 2799 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,699 psi | 66% | 2690 fps | 99.1% |
| Bofors RP5 | <<locked>> | 80% | 52,910 psi | 81% | 2861 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 42,931 psi | 66% | 2690 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 80% | 54,172 psi | 83% | 2854 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,330 psi | 82% | 2841 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,223 psi | 70% | 2812 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,848 psi | 44% | 1680 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,273 psi | 84% | 2831 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 50,966 psi | 78% | 2851 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,647 psi | 76% | 2733 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,272 psi | 53% | 2510 fps | 96.5% |
| Lovex D100 | <<locked>> | 90% | 54,172 psi | 83% | 2841 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 45,469 psi | 70% | 2648 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,925 psi | 54% | 2536 fps | 98.6% |
| Ramshot Grand | <<locked>> | 80% | 52,286 psi | 80% | 2874 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,195 psi | 73% | 2743 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,631 psi | 46% | 1719 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,991 psi | 69% | 2785 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,278 psi | 64% | 2684 fps | 97.6% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,172 psi | 83% | 2841 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 44,309 psi | 68% | 2700 fps | 95.6% |
| Vihtavuori N165 | <<locked>> | 80% | 49,748 psi | 77% | 2736 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 46,006 psi | 71% | 2700 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 80% | 47,195 psi | 73% | 2762 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 80% | 42,177 psi | 65% | 2700 fps | 97.3% |
| Vihtavuori N570 | 71.9 gr | 82% | 43,395 psi | 67% | 2756 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,576 psi | 81% | 2858 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,591 psi | 81% | 2799 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 41 powders for 6.5-300 Weatherby Mag. loaded with the .263 | 150gr | Rhino Solid Shank. ADI AR 2218 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,054 fps. Accurate 8700 gives the best case fill at 100 %, and 41 of the 41 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 150.0 gr projectile in 0.263" 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-50 rank at the top here: for 6.5-300 Weatherby Mag. with the .263 | 150gr | Rhino Solid Shank 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.