Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 155gr | Sierra HPBT LR MatchKing bullet and 40 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% | 57,000 psi | 88% | 2795 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,754 psi | 89% | 2923 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 82% | 56,666 psi | 87% | 2897 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,724 psi | 87% | 2894 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,435 psi | 88% | 3031 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 92% | 56,927 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,261 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,840 psi | 86% | 2795 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,927 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,622 psi | 86% | 2940 fps | 99.2% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,014 psi | 86% | 2936 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,347 psi | 87% | 2861 fps | 99.4% |
| Bofors RP15 | <<locked>> | 84% | 56,942 psi | 88% | 2887 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,927 psi | 88% | 2907 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,261 psi | 88% | 2890 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 58,073 psi | 89% | 2910 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 58,624 psi | 90% | 2884 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,682 psi | 89% | 2871 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,188 psi | 88% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,203 psi | 59% | 1844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 58,436 psi | 90% | 2858 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,622 psi | 86% | 2887 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,305 psi | 88% | 2828 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,753 psi | 86% | 2904 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 55,637 psi | 86% | 2776 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,740 psi | 89% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,029 psi | 88% | 2910 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 55,448 psi | 85% | 2838 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,407 psi | 61% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,667 psi | 89% | 2953 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,724 psi | 87% | 2936 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,114 psi | 85% | 2864 fps | 98.5% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,489 psi | 81% | 2838 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 84% | 57,435 psi | 88% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,942 psi | 88% | 2864 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 86% | 58,407 psi | 90% | 2917 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,826 psi | 87% | 2933 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 58,784 psi | 90% | 3009 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,682 psi | 89% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,942 psi | 88% | 2825 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% | 53,287 psi | 82% | 2740 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 43,047 psi | 66% | 2664 fps | 96% |
| ADI AR 2213 | <<locked>> | 80% | 52,852 psi | 81% | 2838 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,045 psi | 62% | 2598 fps | 98.9% |
| ADI AR 2218 | 74.5 gr | 84% | 39,740 psi | 61% | 2674 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 37,463 psi | 58% | 2575 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,548 psi | 82% | 2835 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,228 psi | 80% | 2743 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,456 psi | 71% | 2710 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 41,292 psi | 64% | 2661 fps | 95.8% |
| Alliant Reloder-50 | 77.4 gr | 86% | 41,843 psi | 64% | 2667 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,516 psi | 76% | 2746 fps | 98.4% |
| Bofors RP15 | <<locked>> | 80% | 50,024 psi | 77% | 2772 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,482 psi | 67% | 2671 fps | 99.4% |
| Bofors RP5 | <<locked>> | 80% | 53,548 psi | 82% | 2835 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,584 psi | 67% | 2671 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 54,810 psi | 84% | 2825 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,954 psi | 83% | 2812 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,209 psi | 71% | 2792 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,747 psi | 44% | 1650 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,810 psi | 84% | 2802 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,851 psi | 80% | 2825 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 84% | 50,386 psi | 78% | 2710 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,809 psi | 54% | 2490 fps | 97.1% |
| Lovex S071 | <<locked>> | 80% | 46,151 psi | 71% | 2625 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,708 psi | 55% | 2520 fps | 99.1% |
| Ramshot Grand | <<locked>> | 80% | 53,084 psi | 82% | 2848 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,964 psi | 74% | 2720 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,718 psi | 46% | 1690 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,050 psi | 71% | 2769 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,032 psi | 65% | 2667 fps | 98.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,047 psi | 65% | 2618 fps | 95.2% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,762 psi | 75% | 2769 fps | 95.6% |
| Vihtavuori N165 | <<locked>> | 80% | 50,488 psi | 78% | 2713 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,656 psi | 67% | 2621 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 80% | 47,863 psi | 74% | 2740 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 42,888 psi | 66% | 2677 fps | 97.8% |
| Vihtavuori N570 | 69.5 gr | 80% | 41,162 psi | 63% | 2671 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,664 psi | 83% | 2831 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,214 psi | 82% | 2769 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 40 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 155gr | Sierra HPBT LR MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,031 fps. Accurate 8700 gives the best case fill at 100 %, and 40 of the 40 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 155.0 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 155gr | Sierra HPBT LR MatchKing 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.