Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Lapua Naturalis 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 IMR 8133 Enduron.
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% | 55,579 psi | 86% | 2897 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,172 psi | 85% | 2995 fps | 98% |
| Accurate MAGPRO | <<locked>> | 82% | 58,291 psi | 90% | 3061 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 84% | 58,508 psi | 90% | 3054 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 58,291 psi | 90% | 3041 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,042 psi | 85% | 3107 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 94% | 58,262 psi | 90% | 3068 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,550 psi | 85% | 2989 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,682 psi | 89% | 2949 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 58,624 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,392 psi | 88% | 3087 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 58,204 psi | 90% | 3091 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 58,088 psi | 89% | 3009 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 58,682 psi | 90% | 3038 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 58,740 psi | 90% | 3061 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,550 psi | 85% | 2989 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 55,724 psi | 86% | 2999 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,826 psi | 87% | 2979 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,970 psi | 86% | 2966 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 58,537 psi | 90% | 3127 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,855 psi | 88% | 2953 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 57,203 psi | 88% | 3038 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,377 psi | 88% | 3054 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 57,943 psi | 89% | 2930 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,419 psi | 85% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 54,824 psi | 84% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 57,493 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,291 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,230 psi | 85% | 3051 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 58,697 psi | 90% | 3091 fps | 99.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,043 psi | 88% | 3009 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 58,740 psi | 90% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 55,811 psi | 86% | 2913 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,463 psi | 85% | 2949 fps | 97.2% |
| Vihtavuori N560 | <<locked>> | 82% | 58,595 psi | 90% | 3064 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 56,855 psi | 88% | 3015 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 88% | 54,897 psi | 84% | 3022 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 90% | 56,275 psi | 87% | 3087 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,376 psi | 85% | 2992 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,317 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% | 52,301 psi | 80% | 2844 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 44,643 psi | 69% | 2802 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 54,447 psi | 84% | 2995 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 51,140 psi | 79% | 2927 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 38,740 psi | 60% | 2674 fps | 97.7% |
| ADI AR 2218 | 78.7 gr | 88% | 44,338 psi | 68% | 2884 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 36,245 psi | 56% | 2651 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,025 psi | 80% | 2930 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,836 psi | 78% | 2844 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,005 psi | 69% | 2808 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 43,033 psi | 66% | 2808 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 90% | 46,978 psi | 72% | 2884 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,051 psi | 74% | 2828 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 48,501 psi | 75% | 2864 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 42,380 psi | 65% | 2759 fps | 98.5% |
| Bofors RP5 | <<locked>> | 80% | 52,025 psi | 80% | 2930 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 42,134 psi | 65% | 2749 fps | 99% |
| Hodgdon H4831 | <<locked>> | 80% | 53,229 psi | 82% | 2917 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,402 psi | 81% | 2904 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,164 psi | 68% | 2874 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 44% | 1729 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,417 psi | 82% | 2897 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 50,154 psi | 77% | 2917 fps | 99.5% |
| IMR 8133 Enduron | 65.7 gr | 80% | 34,040 psi | 52% | 2575 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 45,339 psi | 70% | 2723 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,679 psi | 53% | 2605 fps | 98.1% |
| Ramshot Grand | <<locked>> | 80% | 51,126 psi | 79% | 2936 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 46,441 psi | 71% | 2808 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,733 psi | 46% | 1775 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,135 psi | 68% | 2854 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 40,930 psi | 63% | 2753 fps | 96.8% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 46,673 psi | 72% | 2818 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 55,201 psi | 85% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 49,226 psi | 76% | 2808 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 48,704 psi | 75% | 2828 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 80% | 54,926 psi | 85% | 3005 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 46,717 psi | 72% | 2831 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 80% | 41,756 psi | 64% | 2762 fps | 96.5% |
| Vihtavuori N570 | 73.6 gr | 84% | 45,847 psi | 71% | 2887 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,634 psi | 79% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,808 psi | 80% | 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 41 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Lapua Naturalis. Hodgdon Retumbo delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,127 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 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, IMR 8133 Enduron rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Lapua Naturalis 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.