Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 140gr | Speer TBBC bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo and Vihtavuori N570.
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>> | 84% | 56,739 psi | 87% | 2920 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,576 psi | 81% | 2956 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 82% | 56,043 psi | 86% | 3031 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 57,609 psi | 89% | 3005 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,521 psi | 87% | 3025 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 56,173 psi | 86% | 3015 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,739 psi | 87% | 3140 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 55,883 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,029 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,116 psi | 88% | 3018 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,477 psi | 85% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,391 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,665 psi | 84% | 3041 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,969 psi | 85% | 3038 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,521 psi | 87% | 2986 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 56,565 psi | 87% | 3012 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,086 psi | 86% | 3025 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,116 psi | 88% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,537 psi | 89% | 3031 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 58,769 psi | 90% | 3012 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,841 psi | 89% | 2999 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,173 psi | 86% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 59% | 1936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 58,639 psi | 90% | 2986 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,129 psi | 85% | 3009 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,363 psi | 88% | 2943 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 58,566 psi | 90% | 3074 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 58,798 psi | 90% | 2949 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,347 psi | 87% | 3038 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,232 psi | 88% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,753 psi | 87% | 3035 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,114 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,942 psi | 88% | 3081 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,854 psi | 86% | 3048 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 57,769 psi | 89% | 2976 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,029 psi | 88% | 2986 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,404 psi | 84% | 2966 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,666 psi | 87% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,290 psi | 88% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,493 psi | 88% | 2946 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,869 psi | 88% | 2979 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 57,101 psi | 88% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,478 psi | 87% | 3038 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 58,146 psi | 89% | 3041 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,231 psi | 87% | 3051 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 57,725 psi | 89% | 3117 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,724 psi | 87% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,029 psi | 88% | 2953 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% | 49,763 psi | 77% | 2812 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,295 psi | 70% | 2818 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 80% | 52,185 psi | 80% | 2963 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 53,824 psi | 83% | 2946 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,182 psi | 76% | 2897 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 36,782 psi | 57% | 2631 fps | 96.9% |
| ADI AR 2218 | 80.1 gr | 90% | 45,281 psi | 70% | 2910 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,142 psi | 53% | 2605 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,621 psi | 83% | 2936 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,937 psi | 77% | 2897 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,631 psi | 75% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,830 psi | 66% | 2769 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,801 psi | 67% | 2828 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,456 psi | 73% | 2894 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,499 psi | 72% | 2802 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 46,412 psi | 71% | 2828 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 40,074 psi | 62% | 2713 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 49,937 psi | 77% | 2897 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,103 psi | 62% | 2713 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 51,358 psi | 79% | 2887 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,531 psi | 78% | 2874 fps | 99.2% |
| Hodgdon Retumbo | 67.2 gr | 80% | 41,930 psi | 65% | 2831 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,572 psi | 44% | 1729 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,735 psi | 80% | 2871 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 48,095 psi | 74% | 2881 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,940 psi | 83% | 2884 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,171 psi | 53% | 2582 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 42,902 psi | 66% | 2684 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,372 psi | 50% | 2549 fps | 97% |
| Norma MRP | <<locked>> | 80% | 53,476 psi | 82% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,878 psi | 75% | 2904 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 44,121 psi | 68% | 2769 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 45% | 1772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,756 psi | 64% | 2812 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,276 psi | 59% | 2694 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 54,056 psi | 83% | 2913 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,519 psi | 82% | 2930 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,442 psi | 73% | 2841 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,171 psi | 82% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,664 psi | 83% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,253 psi | 73% | 2776 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 86% | 49,690 psi | 76% | 2851 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 53,621 psi | 83% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,823 psi | 81% | 2972 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 44,353 psi | 68% | 2789 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 39,291 psi | 60% | 2713 fps | 95.5% |
| Vihtavuori N570 | 75 gr | 86% | 46,659 psi | 72% | 2910 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,965 psi | 75% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,806 psi | 77% | 2835 fps | 99.9% |
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 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 140gr | Speer TBBC. ADI AR 2218 delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,140 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 140gr | Speer TBBC 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.