Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 123gr | Reichenberg HDB Universal 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% | 56,753 psi | 87% | 3087 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,998 psi | 85% | 3186 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 84% | 56,043 psi | 86% | 3189 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 57,711 psi | 89% | 3179 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,449 psi | 87% | 3192 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 94% | 55,680 psi | 86% | 3169 fps | 99.7% |
| ADI AR 2218 | <<locked>> | 98% | 56,376 psi | 87% | 3284 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 96% | 55,216 psi | 85% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,290 psi | 88% | 3163 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,956 psi | 88% | 3186 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,230 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,782 psi | 86% | 3166 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,985 psi | 86% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,508 psi | 90% | 3264 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 3251 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,942 psi | 88% | 3146 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 56,391 psi | 87% | 3173 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 55,796 psi | 86% | 3179 fps | 99.7% |
| Bofors RP5 | <<locked>> | 86% | 56,956 psi | 88% | 3186 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 57,334 psi | 88% | 3196 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,376 psi | 85% | 3120 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 58,015 psi | 89% | 3163 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,943 psi | 89% | 3081 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,274 psi | 85% | 3255 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 58% | 2057 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,477 psi | 85% | 3097 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 86% | 55,143 psi | 85% | 3173 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,986 psi | 89% | 3232 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 58,798 psi | 90% | 3117 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,419 psi | 85% | 3192 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,348 psi | 88% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,420 psi | 87% | 3199 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 88% | 54,853 psi | 84% | 3120 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 60% | 2106 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,115 psi | 86% | 3238 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,492 psi | 85% | 3202 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 58,059 psi | 89% | 3143 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 57,276 psi | 88% | 3159 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,898 psi | 88% | 3156 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 55,825 psi | 86% | 3071 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 57,479 psi | 88% | 3123 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,682 psi | 89% | 3114 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,956 psi | 88% | 3130 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 57,000 psi | 88% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,681 psi | 87% | 3202 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 57,943 psi | 89% | 3199 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 55,782 psi | 86% | 3202 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 94% | 57,290 psi | 88% | 3268 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,825 psi | 86% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,363 psi | 88% | 3120 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% | 46,470 psi | 72% | 2907 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 51,271 psi | 79% | 3110 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 48,486 psi | 75% | 3045 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 50,459 psi | 78% | 3048 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 45,701 psi | 70% | 2982 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 36,535 psi | 56% | 2762 fps | 95.2% |
| ADI AR 2218 | 85.9 gr | 94% | 48,617 psi | 75% | 3123 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 31,546 psi | 49% | 2661 fps | 96.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,328 psi | 77% | 3041 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,485 psi | 72% | 2986 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,295 psi | 70% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,450 psi | 61% | 2854 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,837 psi | 80% | 3107 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 50,343 psi | 77% | 3114 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,285 psi | 77% | 3097 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,688 psi | 72% | 2949 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 43,236 psi | 67% | 2913 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 36,898 psi | 57% | 2779 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 46,485 psi | 72% | 2986 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 37,217 psi | 57% | 2782 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 80% | 48,254 psi | 74% | 2986 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,311 psi | 73% | 2966 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,433 psi | 84% | 3028 fps | 100% |
| Hodgdon Retumbo | 69 gr | 80% | 38,609 psi | 59% | 2900 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 44% | 1841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,863 psi | 75% | 2972 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 44,570 psi | 69% | 2966 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 38,435 psi | 59% | 2831 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 40,103 psi | 62% | 2776 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 31,459 psi | 48% | 2657 fps | 95% |
| Norma MRP | <<locked>> | 80% | 49,748 psi | 77% | 3068 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 45,092 psi | 69% | 2982 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 40,654 psi | 63% | 2844 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,283 psi | 45% | 1886 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,072 psi | 59% | 2871 fps | 98.6% |
| ReloadSwiss RS 80 | 78.1 gr | 84% | 40,828 psi | 63% | 2894 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,981 psi | 78% | 3018 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 50,111 psi | 77% | 3031 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,763 psi | 77% | 3025 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 52,243 psi | 80% | 3009 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 50,343 psi | 77% | 3002 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 44,222 psi | 68% | 2871 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 53,200 psi | 82% | 3061 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 50,125 psi | 77% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,240 psi | 76% | 3064 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,176 psi | 63% | 2864 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 86% | 44,933 psi | 69% | 2986 fps | 96% |
| Vihtavuori N570 | <<locked>> | 90% | 49,530 psi | 76% | 3117 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,440 psi | 68% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,717 psi | 72% | 2930 fps | 99% |
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 | 123gr | Reichenberg HDB Universal. ADI AR 2218 delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 2,057 fps to 3,284 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 123.0 gr projectile in 0.264" calls for a 1:10.0 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 .264 | 123gr | Reichenberg HDB Universal 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.