Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | SUS-TAC HPT bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, 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>> | 88% | 58,392 psi | 90% | 3146 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,420 psi | 87% | 3241 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 86% | 57,537 psi | 89% | 3251 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 55,724 psi | 86% | 3176 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 58,102 psi | 89% | 3251 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,927 psi | 88% | 3222 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,885 psi | 89% | 3346 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 98% | 55,999 psi | 86% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,158 psi | 85% | 3159 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,523 psi | 90% | 3245 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,608 psi | 87% | 3150 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,985 psi | 88% | 3222 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,392 psi | 88% | 3235 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,506 psi | 85% | 3245 fps | 97% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,201 psi | 85% | 3225 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,537 psi | 90% | 3205 fps | 97.9% |
| Bofors RP15 | <<locked>> | 90% | 57,943 psi | 89% | 3235 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 56,855 psi | 88% | 3235 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 58,523 psi | 90% | 3245 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 58,624 psi | 90% | 3251 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 57,043 psi | 88% | 3179 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,927 psi | 86% | 3159 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,869 psi | 86% | 3084 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,362 psi | 87% | 3314 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 58% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,725 psi | 89% | 3153 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,595 psi | 90% | 3156 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,159 psi | 88% | 3156 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 88% | 56,449 psi | 87% | 3228 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,172 psi | 85% | 3219 fps | 99.5% |
| Lovex S071 | <<locked>> | 92% | 56,550 psi | 87% | 3117 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,362 psi | 87% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,781 psi | 84% | 3196 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,015 psi | 89% | 3258 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 56,492 psi | 87% | 3182 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 59% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,334 psi | 88% | 3297 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,666 psi | 87% | 3255 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 84% | 55,985 psi | 86% | 3140 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 84% | 55,013 psi | 85% | 3153 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,508 psi | 90% | 3212 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,508 psi | 89% | 3130 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 58,189 psi | 90% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,376 psi | 85% | 3120 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,419 psi | 85% | 3110 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 94% | 58,610 psi | 90% | 3189 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 86% | 58,421 psi | 90% | 3179 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,204 psi | 90% | 3264 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,288 psi | 85% | 3189 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 94% | 57,101 psi | 88% | 3261 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 96% | 58,407 psi | 90% | 3323 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,058 psi | 88% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,274 psi | 85% | 3117 fps | 99.8% |
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% | 44,628 psi | 69% | 2904 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 49,023 psi | 75% | 3100 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 80% | 46,383 psi | 71% | 3031 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 48,559 psi | 75% | 3041 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 43,830 psi | 67% | 2972 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 37,550 psi | 58% | 2815 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 96% | 49,763 psi | 77% | 3176 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 32,126 psi | 49% | 2703 fps | 96% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,515 psi | 75% | 3035 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,599 psi | 69% | 2979 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,323 psi | 67% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,594 psi | 58% | 2844 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,429 psi | 76% | 3100 fps | 100% |
| Alliant Reloder-33 | 85.6 gr | 94% | 51,271 psi | 79% | 3166 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 98% | 51,184 psi | 79% | 3150 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,138 psi | 74% | 3009 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,611 psi | 64% | 2910 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 37,753 psi | 58% | 2831 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 44,599 psi | 69% | 2979 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 80% | 35,505 psi | 55% | 2766 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 46,499 psi | 72% | 2979 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,571 psi | 70% | 2959 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,388 psi | 81% | 3031 fps | 100% |
| Hodgdon Retumbo | 67.5 gr | 80% | 36,666 psi | 56% | 2881 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,128 psi | 83% | 3091 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 54,824 psi | 84% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,224 psi | 73% | 2969 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 42,656 psi | 66% | 2953 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,030 psi | 60% | 2877 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 38,377 psi | 59% | 2766 fps | 98.8% |
| Norma 217 | <<locked>> | 86% | 34,345 psi | 53% | 2772 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 47,529 psi | 73% | 3061 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 42,815 psi | 66% | 2969 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 80% | 38,638 psi | 59% | 2831 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 45% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,158 psi | 56% | 2851 fps | 97.7% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,684 psi | 64% | 2949 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,211 psi | 76% | 3015 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,196 psi | 74% | 3025 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,848 psi | 74% | 3022 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 50,444 psi | 78% | 3005 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 54,317 psi | 84% | 3091 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,515 psi | 75% | 2995 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 42,482 psi | 65% | 2861 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 92% | 54,636 psi | 84% | 3117 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,109 psi | 74% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,108 psi | 73% | 3051 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 80% | 39,247 psi | 60% | 2848 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 88% | 45,977 psi | 71% | 3041 fps | 96% |
| Vihtavuori N570 | 80.6 gr | 92% | 50,531 psi | 78% | 3173 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,076 psi | 65% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,788 psi | 69% | 2920 fps | 98.4% |
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 53 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | SUS-TAC HPT. ADI AR 2218 delivers the highest muzzle velocity at 3,346 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,346 fps. ADI AR 2218 gives the best case fill at 100 %, and 53 of the 53 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 120.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, Alliant Reloder-50, Hodgdon TrailBoss 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | 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.