Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 156gr | Berger LRBTHP 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-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>> | 82% | 57,217 psi | 88% | 2789 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 2923 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 57,130 psi | 88% | 2897 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,232 psi | 88% | 2890 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 58,233 psi | 90% | 3035 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 57,450 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,711 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 56,101 psi | 86% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,421 psi | 88% | 2874 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,115 psi | 86% | 2940 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,507 psi | 87% | 2936 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,710 psi | 87% | 2861 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 57,174 psi | 88% | 2881 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,203 psi | 88% | 2904 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,711 psi | 89% | 2887 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 58,595 psi | 90% | 2910 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 58,146 psi | 89% | 2871 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,783 psi | 89% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,261 psi | 59% | 1841 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 58,523 psi | 90% | 2920 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 55,869 psi | 86% | 2881 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,464 psi | 88% | 2825 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,260 psi | 87% | 2904 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 56,101 psi | 86% | 2772 fps | 100% |
| Norma 217 | <<locked>> | 94% | 58,276 psi | 90% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,522 psi | 89% | 2907 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 55,927 psi | 86% | 2835 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,479 psi | 61% | 1886 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 58,233 psi | 90% | 2953 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,232 psi | 88% | 2936 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,767 psi | 86% | 2864 fps | 98.6% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,924 psi | 81% | 2838 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 84% | 57,885 psi | 89% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,377 psi | 88% | 2861 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 84% | 55,158 psi | 85% | 2858 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,319 psi | 88% | 2936 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 55,143 psi | 85% | 2940 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 58,218 psi | 90% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,377 psi | 88% | 2822 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% | 53,722 psi | 83% | 2740 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,495 psi | 62% | 2602 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 80% | 53,287 psi | 82% | 2835 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,306 psi | 62% | 2595 fps | 99% |
| ADI AR 2218 | 74.7 gr | 84% | 40,132 psi | 62% | 2674 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 37,681 psi | 58% | 2569 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 54,027 psi | 83% | 2831 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,663 psi | 81% | 2740 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,905 psi | 72% | 2710 fps | 100% |
| Alliant Reloder-33 | 74.2 gr | 82% | 41,727 psi | 64% | 2664 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 86% | 42,279 psi | 65% | 2667 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,879 psi | 77% | 2746 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 50,256 psi | 77% | 2769 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,903 psi | 68% | 2671 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 54,027 psi | 83% | 2831 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 44,005 psi | 68% | 2667 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 54,375 psi | 84% | 2808 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,499 psi | 72% | 2785 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,834 psi | 44% | 1647 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 54,563 psi | 84% | 2854 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 80% | 52,315 psi | 81% | 2825 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,529 psi | 73% | 2651 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,215 psi | 54% | 2493 fps | 97.3% |
| Lovex S071 | <<locked>> | 80% | 46,383 psi | 71% | 2618 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,940 psi | 55% | 2520 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 53,577 psi | 82% | 2848 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 48,385 psi | 74% | 2720 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,646 psi | 46% | 1683 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,369 psi | 71% | 2766 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,482 psi | 65% | 2667 fps | 98.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,395 psi | 65% | 2621 fps | 95.4% |
| Vihtavuori 20N29 | <<locked>> | 98% | 49,211 psi | 76% | 2769 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 50,923 psi | 78% | 2710 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,019 psi | 68% | 2621 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 80% | 48,269 psi | 74% | 2736 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 43,294 psi | 67% | 2680 fps | 98% |
| Vihtavuori N570 | 69.7 gr | 80% | 41,568 psi | 64% | 2674 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 54,027 psi | 83% | 2828 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,635 psi | 83% | 2766 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 | 156gr | Berger LRBTHP. ADI AR 2218 delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,035 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 156.0 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-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 156gr | Berger LRBTHP 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.