Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .263 | 120gr | Rhino Penetrator bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 55,434 psi | 85% | 3097 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,319 psi | 88% | 3258 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 58,407 psi | 90% | 3264 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 56,405 psi | 87% | 3186 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 86% | 55,071 psi | 85% | 3199 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 57,986 psi | 89% | 3238 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,520 psi | 84% | 3278 fps | 97% |
| ADI AR 2225 | <<locked>> | 98% | 57,348 psi | 88% | 3264 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,637 psi | 87% | 3182 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,043 psi | 86% | 3173 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,593 psi | 86% | 3192 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,580 psi | 89% | 3163 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 58,117 psi | 89% | 3235 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 58,349 psi | 90% | 3248 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,478 psi | 87% | 3261 fps | 97.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,376 psi | 87% | 3245 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,637 psi | 86% | 3153 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 58,798 psi | 90% | 3245 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,928 psi | 89% | 3251 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,593 psi | 86% | 3192 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 92% | 55,593 psi | 86% | 3199 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 57,885 psi | 89% | 3192 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,724 psi | 87% | 3173 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,623 psi | 87% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,363 psi | 88% | 3323 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 58% | 2077 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,407 psi | 90% | 3159 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,943 psi | 89% | 3166 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 57,363 psi | 88% | 3245 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,217 psi | 87% | 3235 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 57,232 psi | 88% | 3127 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,464 psi | 88% | 3258 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,709 psi | 86% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,636 psi | 84% | 3202 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 90% | 57,348 psi | 88% | 3192 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 60% | 2123 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 58,769 psi | 90% | 3317 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,899 psi | 89% | 3274 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 56,869 psi | 88% | 3153 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 55,724 psi | 86% | 3163 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,332 psi | 85% | 3159 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 58,218 psi | 90% | 3143 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,217 psi | 87% | 3133 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,202 psi | 86% | 3120 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 55,608 psi | 86% | 3133 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,071 psi | 85% | 3209 fps | 99% |
| Vihtavuori N565 | <<locked>> | 90% | 56,318 psi | 87% | 3202 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 58,131 psi | 89% | 3274 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,477 psi | 85% | 3268 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 58,102 psi | 89% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,072 psi | 86% | 3130 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% | 45,295 psi | 70% | 2913 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 49,734 psi | 77% | 3114 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 80% | 47,210 psi | 73% | 3051 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 49,255 psi | 76% | 3054 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 44,483 psi | 68% | 2986 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 84% | 38,116 psi | 59% | 2828 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 50,589 psi | 78% | 3196 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 30,632 psi | 47% | 2654 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,632 psi | 76% | 3054 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,168 psi | 76% | 3045 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,281 psi | 70% | 2992 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,048 psi | 68% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,232 psi | 59% | 2858 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,386 psi | 78% | 3114 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,515 psi | 75% | 3107 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 52,330 psi | 81% | 3166 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,791 psi | 75% | 3022 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,090 psi | 65% | 2917 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 38,363 psi | 59% | 2844 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 45,281 psi | 70% | 2992 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,056 psi | 55% | 2779 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 47,108 psi | 73% | 2992 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,195 psi | 71% | 2972 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,142 psi | 82% | 3041 fps | 100% |
| Hodgdon Retumbo | 68.5 gr | 80% | 37,449 psi | 58% | 2897 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,297 psi | 44% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,781 psi | 84% | 3100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,819 psi | 74% | 2979 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 43,337 psi | 67% | 2969 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,769 psi | 61% | 2894 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 38,986 psi | 60% | 2779 fps | 98.9% |
| Norma 217 | <<locked>> | 84% | 32,648 psi | 50% | 2720 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 48,225 psi | 74% | 3071 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 43,729 psi | 67% | 2982 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 80% | 39,436 psi | 61% | 2848 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 45% | 1903 fps | 100% |
| ReloadSwiss RS 76 | 73.3 gr | 80% | 36,883 psi | 57% | 2867 fps | 98% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,627 psi | 66% | 2966 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 49,864 psi | 77% | 3028 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 48,892 psi | 75% | 3038 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,544 psi | 75% | 3031 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 50,995 psi | 78% | 3015 fps | 98.2% |
| Somchem S385 | <<locked>> | 80% | 49,182 psi | 76% | 3009 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 43,091 psi | 66% | 2874 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 48,834 psi | 75% | 3018 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,776 psi | 74% | 3064 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 39,842 psi | 61% | 2861 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 86% | 43,642 psi | 67% | 2986 fps | 95.2% |
| Vihtavuori N570 | 81.7 gr | 92% | 51,590 psi | 79% | 3192 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,902 psi | 66% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,397 psi | 70% | 2933 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 51 powders for 6.5-300 Weatherby Mag. loaded with the .263 | 120gr | Rhino Penetrator. Hodgdon Retumbo delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,323 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 51 of the 51 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 0.263" calls for a 1:9.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .263 | 120gr | Rhino Penetrator 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.