Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 121gr | SUS-TAC LRT bullet and 54 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% | 58,624 psi | 90% | 3136 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,666 psi | 87% | 3238 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 57,551 psi | 89% | 3241 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 55,695 psi | 86% | 3163 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 58,320 psi | 90% | 3245 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 57,217 psi | 88% | 3219 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 58,030 psi | 89% | 3337 fps | 97.9% |
| ADI AR 2225 | <<locked>> | 98% | 56,318 psi | 87% | 3238 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,956 psi | 86% | 3159 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,361 psi | 85% | 3153 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,755 psi | 90% | 3238 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,840 psi | 87% | 3143 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,276 psi | 88% | 3215 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,638 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,608 psi | 86% | 3238 fps | 97.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,332 psi | 85% | 3222 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,523 psi | 90% | 3196 fps | 98% |
| Bofors RP15 | <<locked>> | 90% | 57,914 psi | 89% | 3222 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,145 psi | 88% | 3228 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 58,755 psi | 90% | 3238 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,781 psi | 84% | 3176 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 57,043 psi | 88% | 3169 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,115 psi | 86% | 3153 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,057 psi | 86% | 3077 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,420 psi | 87% | 3304 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 58% | 2060 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,899 psi | 89% | 3143 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,740 psi | 90% | 3146 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,348 psi | 88% | 3150 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 56,666 psi | 87% | 3222 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,245 psi | 85% | 3209 fps | 99.5% |
| Lovex S071 | <<locked>> | 92% | 56,536 psi | 87% | 3107 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,463 psi | 87% | 3235 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,998 psi | 85% | 3189 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,030 psi | 89% | 3248 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 56,521 psi | 87% | 3169 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 60% | 2113 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,682 psi | 89% | 3294 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,942 psi | 88% | 3251 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 56,188 psi | 86% | 3133 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 84% | 55,230 psi | 85% | 3146 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,450 psi | 90% | 3202 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,725 psi | 89% | 3123 fps | 99.2% |
| Somchem S365 | <<locked>> | 82% | 58,349 psi | 90% | 3140 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,593 psi | 86% | 3114 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,637 psi | 86% | 3100 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 94% | 58,653 psi | 90% | 3179 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 86% | 58,610 psi | 90% | 3173 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,247 psi | 90% | 3255 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,579 psi | 86% | 3182 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 57,174 psi | 88% | 3251 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 58,740 psi | 90% | 3320 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,377 psi | 88% | 3235 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,259 psi | 85% | 3107 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% | 44,759 psi | 69% | 2897 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 49,211 psi | 76% | 3097 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 80% | 46,557 psi | 72% | 3028 fps | 96.7% |
| ADI AR 2209 | <<locked>> | 80% | 48,718 psi | 75% | 3035 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 44,005 psi | 68% | 2969 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 37,710 psi | 58% | 2812 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 96% | 49,879 psi | 77% | 3169 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 32,256 psi | 50% | 2700 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,110 psi | 76% | 3035 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,646 psi | 75% | 3028 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,773 psi | 69% | 2972 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,482 psi | 67% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,724 psi | 58% | 2838 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,661 psi | 76% | 3094 fps | 100% |
| Alliant Reloder-33 | 85.4 gr | 94% | 51,590 psi | 79% | 3163 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 51,314 psi | 79% | 3143 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,138 psi | 74% | 3002 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 41,582 psi | 64% | 2897 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 37,724 psi | 58% | 2825 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 44,773 psi | 69% | 2972 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 35,621 psi | 55% | 2759 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,456 psi | 71% | 2969 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,701 psi | 70% | 2953 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,547 psi | 81% | 3022 fps | 100% |
| Hodgdon Retumbo | 67.3 gr | 80% | 36,796 psi | 57% | 2874 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 44% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,259 psi | 84% | 3081 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,998 psi | 85% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,326 psi | 73% | 2959 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 42,815 psi | 66% | 2949 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,189 psi | 60% | 2874 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,450 psi | 59% | 2759 fps | 98.8% |
| Norma 217 | <<locked>> | 84% | 32,039 psi | 49% | 2700 fps | 95% |
| Norma MRP | <<locked>> | 80% | 47,703 psi | 73% | 3054 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 42,975 psi | 66% | 2963 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 80% | 38,798 psi | 60% | 2825 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 45% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,318 psi | 56% | 2848 fps | 97.9% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,916 psi | 65% | 2943 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,356 psi | 76% | 3009 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 48,356 psi | 74% | 3018 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,008 psi | 74% | 3015 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 50,430 psi | 78% | 2995 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 54,491 psi | 84% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,675 psi | 75% | 2989 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 42,641 psi | 66% | 2854 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 92% | 54,926 psi | 85% | 3114 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,240 psi | 74% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,297 psi | 73% | 3045 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 80% | 39,407 psi | 61% | 2841 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 86% | 42,902 psi | 66% | 2963 fps | 95% |
| Vihtavuori N570 | 80.4 gr | 92% | 50,821 psi | 78% | 3169 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,293 psi | 65% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,962 psi | 69% | 2913 fps | 98.5% |
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 54 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 121gr | SUS-TAC LRT. ADI AR 2218 delivers the highest muzzle velocity at 3,337 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,337 fps. ADI AR 2218 gives the best case fill at 100 %, and 54 of the 54 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 121.0 gr projectile in 0.264" calls for a 1:8.0 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 | 121gr | SUS-TAC LRT 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.