Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Sierra Pro-Hunter 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 ReloadSwiss RS 80.
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% | 56,985 psi | 88% | 3120 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 55,027 psi | 85% | 3212 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 84% | 55,898 psi | 86% | 3219 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 57,754 psi | 89% | 3209 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,608 psi | 87% | 3222 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 94% | 55,680 psi | 86% | 3199 fps | 99.7% |
| ADI AR 2218 | <<locked>> | 98% | 56,507 psi | 87% | 3314 fps | 97.7% |
| ADI AR 2225 | <<locked>> | 96% | 55,129 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,334 psi | 88% | 3196 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,145 psi | 88% | 3215 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,230 psi | 85% | 3120 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,883 psi | 86% | 3196 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,912 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,668 psi | 90% | 3297 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,755 psi | 90% | 3281 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,971 psi | 88% | 3176 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 56,550 psi | 87% | 3205 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 55,840 psi | 86% | 3209 fps | 99.6% |
| Bofors RP5 | <<locked>> | 86% | 57,145 psi | 88% | 3215 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 57,334 psi | 88% | 3225 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 55,376 psi | 85% | 3150 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 86% | 58,175 psi | 90% | 3196 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,885 psi | 89% | 3110 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,376 psi | 85% | 3287 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,913 psi | 58% | 2087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,521 psi | 85% | 3127 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 86% | 55,129 psi | 85% | 3202 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 58,131 psi | 89% | 3261 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 58,740 psi | 90% | 3146 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,564 psi | 86% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,305 psi | 88% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,536 psi | 87% | 3228 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 88% | 54,853 psi | 84% | 3146 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,798 psi | 60% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,231 psi | 87% | 3268 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,564 psi | 86% | 3228 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 58,146 psi | 89% | 3179 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 57,319 psi | 88% | 3189 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,942 psi | 88% | 3186 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,753 psi | 86% | 3100 fps | 99.1% |
| Somchem S385 | <<locked>> | 84% | 57,493 psi | 88% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,609 psi | 89% | 3140 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,130 psi | 88% | 3163 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 57,043 psi | 88% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,608 psi | 87% | 3232 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 57,972 psi | 89% | 3228 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 92% | 55,912 psi | 86% | 3228 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 94% | 57,406 psi | 88% | 3297 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,941 psi | 86% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,493 psi | 88% | 3153 fps | 99.9% |
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% | 46,398 psi | 71% | 2933 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 51,285 psi | 79% | 3143 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 48,486 psi | 75% | 3074 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 50,401 psi | 78% | 3074 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 45,788 psi | 70% | 3012 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 82% | 36,593 psi | 56% | 2789 fps | 95% |
| ADI AR 2218 | 87.3 gr | 94% | 48,660 psi | 75% | 3150 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 31,473 psi | 48% | 2677 fps | 95.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,285 psi | 77% | 3068 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,572 psi | 72% | 3018 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,266 psi | 70% | 2949 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,378 psi | 61% | 2877 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,054 psi | 80% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 50,415 psi | 78% | 3140 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,444 psi | 78% | 3123 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,818 psi | 72% | 2979 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 43,381 psi | 67% | 2946 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 36,840 psi | 57% | 2799 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 46,572 psi | 72% | 3018 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 37,144 psi | 57% | 2805 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 48,153 psi | 74% | 3012 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,413 psi | 73% | 2995 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,433 psi | 84% | 3061 fps | 100% |
| Hodgdon Retumbo | 70.1 gr | 80% | 38,551 psi | 59% | 2923 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 44% | 1867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,791 psi | 75% | 2999 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 44,512 psi | 69% | 2989 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 38,406 psi | 59% | 2854 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 39,987 psi | 62% | 2799 fps | 99.2% |
| Norma 217 | <<locked>> | 84% | 33,881 psi | 52% | 2749 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 49,806 psi | 77% | 3097 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 44,962 psi | 69% | 3005 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 40,683 psi | 63% | 2871 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,043 psi | 59% | 2894 fps | 98.4% |
| ReloadSwiss RS 80 | 81.3 gr | 86% | 44,164 psi | 68% | 2999 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,937 psi | 78% | 3048 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 50,067 psi | 77% | 3058 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,719 psi | 77% | 3054 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 52,257 psi | 80% | 3038 fps | 98.5% |
| Somchem S385 | <<locked>> | 80% | 50,444 psi | 78% | 3031 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 44,135 psi | 68% | 2894 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 53,214 psi | 82% | 3091 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 50,082 psi | 77% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,298 psi | 76% | 3091 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 41,060 psi | 63% | 2887 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 45,005 psi | 69% | 3012 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 90% | 49,516 psi | 76% | 3143 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,527 psi | 69% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,601 psi | 72% | 2956 fps | 98.8% |
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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Sierra Pro-Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,314 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 120.0 gr projectile in 0.264" calls for a 1:11.5 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, ReloadSwiss RS 80 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Sierra Pro-Hunter 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.