Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 133gr | CutEdge MTAC bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 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>> | 86% | 56,768 psi | 87% | 2992 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 55,056 psi | 85% | 3091 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 84% | 56,057 psi | 86% | 3097 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 58,030 psi | 89% | 3084 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,739 psi | 87% | 3097 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 56,130 psi | 86% | 3081 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 56,710 psi | 87% | 3205 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 96% | 55,376 psi | 85% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,566 psi | 89% | 3071 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,130 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,405 psi | 85% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,144 psi | 86% | 3074 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,941 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,479 psi | 90% | 3176 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 3163 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,130 psi | 88% | 3061 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 56,536 psi | 87% | 3081 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,709 psi | 86% | 3087 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 57,130 psi | 88% | 3094 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,551 psi | 89% | 3104 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,492 psi | 85% | 3028 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 58,247 psi | 90% | 3074 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 58,131 psi | 89% | 2982 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,651 psi | 86% | 3163 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 58% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,709 psi | 86% | 3009 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 55,390 psi | 85% | 3084 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 58,073 psi | 89% | 3140 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 58,653 psi | 90% | 3018 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,593 psi | 86% | 3100 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,319 psi | 88% | 3104 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,623 psi | 87% | 3107 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 55,100 psi | 85% | 3031 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,870 psi | 60% | 2021 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,507 psi | 87% | 3150 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,390 psi | 85% | 3110 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 58,291 psi | 90% | 3051 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 57,450 psi | 88% | 3068 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,072 psi | 88% | 3061 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,956 psi | 86% | 2982 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 57,435 psi | 88% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,682 psi | 89% | 3018 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,043 psi | 88% | 3045 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 84% | 56,927 psi | 88% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,695 psi | 87% | 3110 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 57,827 psi | 89% | 3107 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 55,956 psi | 86% | 3114 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 57,464 psi | 88% | 3182 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,217 psi | 87% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,551 psi | 89% | 3031 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% | 46,238 psi | 71% | 2815 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 51,358 psi | 79% | 3022 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 80% | 48,617 psi | 75% | 2959 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 50,676 psi | 78% | 2959 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 45,934 psi | 71% | 2900 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 82% | 36,535 psi | 56% | 2684 fps | 96.1% |
| ADI AR 2218 | 81.5 gr | 92% | 44,991 psi | 69% | 2963 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,227 psi | 48% | 2579 fps | 96.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,502 psi | 78% | 2949 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,572 psi | 72% | 2900 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,252 psi | 70% | 2828 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,479 psi | 61% | 2769 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,069 psi | 80% | 3015 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 46,528 psi | 72% | 2953 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,096 psi | 77% | 3015 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,874 psi | 68% | 2808 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 43,221 psi | 67% | 2828 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 36,753 psi | 57% | 2694 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 46,572 psi | 72% | 2900 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 37,086 psi | 57% | 2700 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 48,283 psi | 74% | 2900 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,485 psi | 73% | 2881 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,491 psi | 84% | 2930 fps | 100% |
| Hodgdon Retumbo | 66.9 gr | 80% | 38,508 psi | 59% | 2815 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1765 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,979 psi | 75% | 2887 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 44,585 psi | 69% | 2877 fps | 98.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,650 psi | 55% | 2684 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 39,566 psi | 61% | 2680 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 31,227 psi | 48% | 2575 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 49,835 psi | 77% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,237 psi | 70% | 2900 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 80% | 40,466 psi | 62% | 2759 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 45% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,942 psi | 58% | 2789 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 40,669 psi | 63% | 2812 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 51,097 psi | 79% | 2930 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 50,198 psi | 77% | 2940 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,864 psi | 77% | 2936 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 52,214 psi | 80% | 2920 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 50,386 psi | 78% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,208 psi | 68% | 2785 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 49,661 psi | 76% | 2910 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,995 psi | 77% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,371 psi | 76% | 2979 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 40,915 psi | 63% | 2776 fps | 96.9% |
| Vihtavuori N568 | <<locked>> | 84% | 41,771 psi | 64% | 2831 fps | 95.7% |
| Vihtavuori N570 | 76.4 gr | 88% | 46,108 psi | 71% | 2959 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,541 psi | 69% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,673 psi | 72% | 2844 fps | 99.4% |
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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 133gr | CutEdge MTAC. ADI AR 2218 delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,205 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 50 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 133.0 gr projectile in 0.264" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 133gr | CutEdge MTAC 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.