Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 142gr | SUS-TAC HPT bullet and 51 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 Hodgdon Retumbo.
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% | 55,811 psi | 86% | 2890 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,140 psi | 79% | 2917 fps | 97.1% |
| Accurate High Country | <<locked>> | 82% | 57,696 psi | 89% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 54,708 psi | 84% | 2989 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 56,565 psi | 87% | 2972 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,361 psi | 85% | 2989 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,926 psi | 85% | 2979 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,201 psi | 85% | 3100 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 58,508 psi | 90% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,057 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,941 psi | 86% | 2986 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 58,088 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,998 psi | 85% | 2966 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,435 psi | 88% | 3077 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,421 psi | 88% | 3071 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,535 psi | 85% | 2949 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 55,419 psi | 85% | 2976 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 58,798 psi | 90% | 3048 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,941 psi | 86% | 2986 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,260 psi | 87% | 2995 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,914 psi | 89% | 2982 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,768 psi | 87% | 2963 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 58,624 psi | 90% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,058 psi | 59% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,798 psi | 89% | 2956 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 57,928 psi | 89% | 3038 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,579 psi | 87% | 2910 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,188 psi | 88% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,885 psi | 89% | 2920 fps | 100% |
| Norma 217 | <<locked>> | 98% | 58,769 psi | 90% | 3064 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,057 psi | 86% | 2999 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,303 psi | 85% | 2995 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 57,986 psi | 89% | 2986 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,059 psi | 60% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,405 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 58,595 psi | 90% | 3081 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 56,768 psi | 87% | 2940 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 55,970 psi | 86% | 2953 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,968 psi | 82% | 2927 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,608 psi | 86% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 58,131 psi | 89% | 2933 fps | 99.9% |
| Somchem S385 | <<locked>> | 82% | 56,376 psi | 87% | 2923 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,434 psi | 87% | 2913 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,709 psi | 86% | 2943 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 55,999 psi | 86% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,347 psi | 85% | 2999 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 56,942 psi | 88% | 3005 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 54,868 psi | 84% | 3012 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 56,347 psi | 87% | 3081 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,274 psi | 85% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,014 psi | 86% | 2920 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% | 48,762 psi | 75% | 2776 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,106 psi | 68% | 2785 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 53,824 psi | 83% | 2982 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 51,068 psi | 79% | 2927 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 52,968 psi | 82% | 2913 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,167 psi | 74% | 2861 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 36,056 psi | 55% | 2602 fps | 96.7% |
| ADI AR 2218 | 77.9 gr | 90% | 44,222 psi | 68% | 2874 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 33,446 psi | 51% | 2572 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,620 psi | 81% | 2900 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,921 psi | 75% | 2864 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,718 psi | 73% | 2785 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,959 psi | 65% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 42,569 psi | 66% | 2792 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 46,137 psi | 71% | 2858 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,759 psi | 70% | 2772 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 45,585 psi | 70% | 2799 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 39,117 psi | 60% | 2680 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 48,921 psi | 75% | 2864 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 39,378 psi | 61% | 2680 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 50,633 psi | 78% | 2858 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,588 psi | 76% | 2841 fps | 99.1% |
| Hodgdon Retumbo | 65.4 gr | 80% | 41,060 psi | 63% | 2802 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 44% | 1709 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,010 psi | 79% | 2841 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 47,065 psi | 72% | 2848 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,866 psi | 81% | 2848 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,272 psi | 51% | 2549 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 42,206 psi | 65% | 2654 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,415 psi | 48% | 2513 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 52,257 psi | 80% | 2936 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,848 psi | 74% | 2867 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 43,047 psi | 66% | 2733 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 45% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,654 psi | 63% | 2776 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,318 psi | 57% | 2657 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 53,243 psi | 82% | 2884 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 52,446 psi | 81% | 2894 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,238 psi | 71% | 2802 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,098 psi | 80% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 54,462 psi | 84% | 2874 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 52,707 psi | 81% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,325 psi | 71% | 2743 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 48,689 psi | 75% | 2815 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 52,692 psi | 81% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,648 psi | 79% | 2936 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 43,439 psi | 67% | 2756 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 80% | 38,464 psi | 59% | 2680 fps | 95.3% |
| Vihtavuori N570 | 72.9 gr | 86% | 45,455 psi | 70% | 2871 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,543 psi | 73% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,878 psi | 75% | 2802 fps | 99.8% |
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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 142gr | SUS-TAC HPT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,120 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,120 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 142.0 gr projectile in 0.264" calls for a 1:7.5 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, Hodgdon Retumbo rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 142gr | SUS-TAC HPT 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.