Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Frontier BTSP 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% | 58,465 psi | 90% | 3146 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,463 psi | 87% | 3241 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 86% | 57,624 psi | 89% | 3255 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 55,782 psi | 86% | 3176 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 58,160 psi | 90% | 3251 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 57,217 psi | 88% | 3228 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,899 psi | 89% | 3343 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 98% | 56,289 psi | 87% | 3248 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,434 psi | 85% | 3166 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,595 psi | 90% | 3245 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,695 psi | 87% | 3150 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,290 psi | 88% | 3228 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,682 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,564 psi | 86% | 3248 fps | 97.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,463 psi | 85% | 3232 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,537 psi | 90% | 3205 fps | 97.9% |
| Bofors RP15 | <<locked>> | 90% | 57,986 psi | 89% | 3235 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,145 psi | 88% | 3238 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 58,595 psi | 90% | 3245 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 58,653 psi | 90% | 3248 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 57,087 psi | 88% | 3182 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,956 psi | 86% | 3159 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,941 psi | 86% | 3084 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,405 psi | 87% | 3314 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 58% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,783 psi | 89% | 3153 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,653 psi | 90% | 3156 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,203 psi | 88% | 3156 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 88% | 56,521 psi | 87% | 3232 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,230 psi | 85% | 3222 fps | 99.5% |
| Lovex S071 | <<locked>> | 92% | 56,652 psi | 87% | 3117 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,449 psi | 87% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,853 psi | 84% | 3196 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,059 psi | 89% | 3258 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 56,550 psi | 87% | 3182 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,754 psi | 60% | 2119 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,638 psi | 89% | 3301 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,942 psi | 88% | 3261 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 56,275 psi | 87% | 3146 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 84% | 55,114 psi | 85% | 3156 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,552 psi | 90% | 3215 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,754 psi | 89% | 3136 fps | 99.2% |
| Somchem S365 | <<locked>> | 82% | 58,262 psi | 90% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,448 psi | 85% | 3123 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,463 psi | 85% | 3110 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 94% | 58,639 psi | 90% | 3189 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 86% | 58,479 psi | 90% | 3182 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,276 psi | 90% | 3268 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,579 psi | 86% | 3192 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 94% | 57,159 psi | 88% | 3261 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 96% | 58,711 psi | 90% | 3330 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,116 psi | 88% | 3241 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,317 psi | 85% | 3120 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% | 44,686 psi | 69% | 2907 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 49,081 psi | 76% | 3104 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 80% | 46,456 psi | 71% | 3035 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 48,646 psi | 75% | 3045 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 43,888 psi | 68% | 2976 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 37,608 psi | 58% | 2822 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 96% | 49,821 psi | 77% | 3179 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 32,169 psi | 50% | 2707 fps | 96% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,573 psi | 75% | 3035 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,686 psi | 69% | 2979 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,395 psi | 67% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,652 psi | 58% | 2844 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,487 psi | 76% | 3104 fps | 100% |
| Alliant Reloder-33 | 85.8 gr | 94% | 51,561 psi | 79% | 3173 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 98% | 51,256 psi | 79% | 3150 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,167 psi | 74% | 3009 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,669 psi | 64% | 2913 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 37,811 psi | 58% | 2835 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 44,686 psi | 69% | 2979 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 80% | 35,563 psi | 55% | 2769 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 46,557 psi | 72% | 2982 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,629 psi | 70% | 2963 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,460 psi | 81% | 3031 fps | 100% |
| Hodgdon Retumbo | 67.7 gr | 80% | 36,883 psi | 57% | 2884 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,186 psi | 83% | 3091 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 55,129 psi | 85% | 3100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,282 psi | 73% | 2969 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 42,714 psi | 66% | 2956 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,233 psi | 60% | 2884 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,435 psi | 59% | 2766 fps | 98.8% |
| Norma 217 | <<locked>> | 84% | 32,097 psi | 49% | 2710 fps | 95% |
| Norma MRP | <<locked>> | 80% | 47,587 psi | 73% | 3061 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 42,873 psi | 66% | 2969 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 80% | 38,711 psi | 60% | 2831 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 45% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,216 psi | 56% | 2851 fps | 97.7% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,901 psi | 64% | 2953 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 49,269 psi | 76% | 3015 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,254 psi | 74% | 3025 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,935 psi | 74% | 3022 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 50,502 psi | 78% | 3005 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 54,389 psi | 84% | 3091 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,602 psi | 75% | 2999 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 42,540 psi | 65% | 2864 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 92% | 54,694 psi | 84% | 3117 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,182 psi | 74% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,166 psi | 73% | 3051 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 39,305 psi | 60% | 2851 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 86% | 42,917 psi | 66% | 2972 fps | 95% |
| Vihtavuori N570 | 80.7 gr | 92% | 50,589 psi | 78% | 3176 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,177 psi | 65% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,860 psi | 69% | 2923 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 | Frontier BTSP. ADI AR 2218 delivers the highest muzzle velocity at 3,343 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,343 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 | Frontier BTSP 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.