Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .263 | 120gr | Rhino Solid Shank bullet and 51 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% | 56,637 psi | 87% | 3117 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 58,798 psi | 90% | 3278 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 84% | 55,796 psi | 86% | 3219 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 57,638 psi | 89% | 3205 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,275 psi | 87% | 3215 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 94% | 55,593 psi | 86% | 3196 fps | 99.7% |
| ADI AR 2218 | <<locked>> | 98% | 56,246 psi | 87% | 3307 fps | 97.6% |
| ADI AR 2225 | <<locked>> | 96% | 55,013 psi | 85% | 3219 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,812 psi | 89% | 3202 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,217 psi | 88% | 3192 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,797 psi | 87% | 3212 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,114 psi | 85% | 3120 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,767 psi | 86% | 3196 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,767 psi | 86% | 3202 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,392 psi | 90% | 3291 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 3278 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,710 psi | 87% | 3173 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 56,231 psi | 87% | 3202 fps | 99.8% |
| Bofors RP30 | <<locked>> | 92% | 55,521 psi | 85% | 3205 fps | 99.6% |
| Bofors RP5 | <<locked>> | 86% | 56,797 psi | 87% | 3212 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 56,956 psi | 88% | 3219 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 55,230 psi | 85% | 3146 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,856 psi | 89% | 3192 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,740 psi | 89% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,969 psi | 85% | 3281 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 58% | 2083 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,434 psi | 85% | 3123 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 86% | 54,752 psi | 84% | 3196 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,812 psi | 89% | 3255 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 58,639 psi | 90% | 3146 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,434 psi | 85% | 3219 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,159 psi | 88% | 3228 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,159 psi | 86% | 3222 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 88% | 54,766 psi | 84% | 3150 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,769 psi | 60% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,883 psi | 86% | 3264 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,230 psi | 85% | 3225 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 58,001 psi | 89% | 3176 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 56,971 psi | 88% | 3182 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,594 psi | 87% | 3179 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,651 psi | 86% | 3100 fps | 99% |
| Somchem S385 | <<locked>> | 84% | 57,377 psi | 88% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,537 psi | 89% | 3140 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,826 psi | 87% | 3153 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 56,913 psi | 88% | 3153 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,492 psi | 87% | 3228 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 57,667 psi | 89% | 3222 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 92% | 55,593 psi | 86% | 3225 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 94% | 57,058 psi | 88% | 3294 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,811 psi | 86% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,174 psi | 88% | 3146 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% | 46,282 psi | 71% | 2933 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 50,952 psi | 78% | 3133 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 48,356 psi | 74% | 3071 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 50,285 psi | 77% | 3071 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 45,672 psi | 70% | 3009 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 39,088 psi | 60% | 2851 fps | 96% |
| ADI AR 2218 | 87 gr | 94% | 48,414 psi | 75% | 3143 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,386 psi | 48% | 2674 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,604 psi | 78% | 3071 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,169 psi | 77% | 3064 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,456 psi | 71% | 3015 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,121 psi | 69% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,247 psi | 60% | 2874 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,706 psi | 80% | 3133 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 50,125 psi | 77% | 3136 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,183 psi | 77% | 3120 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,557 psi | 72% | 2976 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 43,250 psi | 67% | 2943 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 36,738 psi | 57% | 2799 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 46,456 psi | 71% | 3015 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 37,057 psi | 57% | 2805 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 48,051 psi | 74% | 3009 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,297 psi | 73% | 2992 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,085 psi | 83% | 3051 fps | 100% |
| Hodgdon Retumbo | 69.9 gr | 80% | 38,435 psi | 59% | 2920 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,689 psi | 75% | 2995 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 44,382 psi | 68% | 2989 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 38,276 psi | 59% | 2851 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 39,813 psi | 61% | 2795 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 33,750 psi | 52% | 2746 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 49,472 psi | 76% | 3091 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 44,817 psi | 69% | 3005 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 40,538 psi | 62% | 2867 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,225 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,927 psi | 58% | 2890 fps | 98.4% |
| ReloadSwiss RS 80 | 81.1 gr | 86% | 44,034 psi | 68% | 2992 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 50,821 psi | 78% | 3045 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 49,937 psi | 77% | 3058 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,588 psi | 76% | 3051 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 51,953 psi | 80% | 3031 fps | 98.5% |
| Somchem S385 | <<locked>> | 80% | 50,328 psi | 77% | 3028 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 44,034 psi | 68% | 2890 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 90% | 53,127 psi | 82% | 3087 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 49,763 psi | 77% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,979 psi | 75% | 3087 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 40,944 psi | 63% | 2884 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 44,889 psi | 69% | 3012 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 90% | 49,385 psi | 76% | 3143 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,338 psi | 68% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,499 psi | 72% | 2953 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 51 powders for 6.5-300 Weatherby Mag. loaded with the .263 | 120gr | Rhino Solid Shank. ADI AR 2218 delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 2,083 fps to 3,307 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 1:11.0 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 .263 | 120gr | Rhino Solid Shank 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.