Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 135gr | Berger Classic Hybrid 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 ADI AR 2218, 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>> | 84% | 55,869 psi | 86% | 2956 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,547 psi | 79% | 2979 fps | 96.8% |
| Accurate High Country | <<locked>> | 82% | 57,870 psi | 89% | 3114 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 82% | 55,027 psi | 85% | 3058 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 82% | 56,782 psi | 87% | 3041 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,593 psi | 86% | 3058 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 92% | 54,998 psi | 85% | 3045 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 96% | 55,506 psi | 85% | 3163 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 96% | 58,769 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,217 psi | 87% | 3025 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,173 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 58,146 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,303 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,812 psi | 89% | 3143 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 58,015 psi | 89% | 3136 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,825 psi | 86% | 3018 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 55,608 psi | 86% | 3045 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,201 psi | 85% | 3054 fps | 99.9% |
| Bofors RP5 | <<locked>> | 84% | 56,173 psi | 86% | 3051 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,333 psi | 87% | 3061 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 58,073 psi | 89% | 3051 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,985 psi | 88% | 3031 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,926 psi | 85% | 3127 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,101 psi | 59% | 1972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,856 psi | 89% | 3022 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 58,044 psi | 89% | 3104 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,682 psi | 89% | 3110 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 58,073 psi | 89% | 2989 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,259 psi | 85% | 3071 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,246 psi | 87% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,608 psi | 86% | 3068 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 58,160 psi | 90% | 3054 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 60% | 2014 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,753 psi | 86% | 3110 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,708 psi | 84% | 3074 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 82% | 56,971 psi | 88% | 3012 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 56,188 psi | 86% | 3022 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,490 psi | 82% | 2992 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,825 psi | 86% | 3018 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 58,392 psi | 90% | 3002 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 56,449 psi | 87% | 2989 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,565 psi | 87% | 2979 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,014 psi | 86% | 3009 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 56,260 psi | 87% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,521 psi | 85% | 3068 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 88% | 57,043 psi | 88% | 3068 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 90% | 55,216 psi | 85% | 3077 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 92% | 56,840 psi | 87% | 3150 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,434 psi | 85% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,144 psi | 86% | 2986 fps | 100% |
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% | 49,023 psi | 75% | 2841 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 47,761 psi | 74% | 2910 fps | 95.8% |
| Accurate High Country | <<locked>> | 80% | 54,114 psi | 83% | 3051 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 51,271 psi | 79% | 2992 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 53,069 psi | 82% | 2979 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 48,356 psi | 74% | 2927 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 36,143 psi | 56% | 2654 fps | 96.2% |
| ADI AR 2218 | 81 gr | 90% | 44,570 psi | 69% | 2933 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 33,489 psi | 52% | 2621 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,881 psi | 81% | 2969 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,153 psi | 76% | 2930 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,906 psi | 74% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,032 psi | 65% | 2799 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 46,209 psi | 71% | 2923 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 92% | 46,398 psi | 71% | 2913 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,774 psi | 70% | 2828 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 45,701 psi | 70% | 2861 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 39,320 psi | 61% | 2736 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 49,153 psi | 76% | 2930 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 39,407 psi | 61% | 2736 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 50,604 psi | 78% | 2920 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,806 psi | 77% | 2907 fps | 98.9% |
| Hodgdon Retumbo | 67.9 gr | 80% | 41,118 psi | 63% | 2858 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 44% | 1762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,082 psi | 79% | 2904 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 47,094 psi | 72% | 2907 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 35,810 psi | 55% | 2664 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 42,264 psi | 65% | 2713 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 31,531 psi | 49% | 2562 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 52,562 psi | 81% | 3002 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,935 psi | 74% | 2930 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 43,279 psi | 67% | 2795 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,399 psi | 45% | 1804 fps | 100% |
| ReloadSwiss RS 76 | 72.7 gr | 80% | 40,814 psi | 63% | 2831 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 40,524 psi | 62% | 2789 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 53,374 psi | 82% | 2949 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 52,533 psi | 81% | 2963 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,514 psi | 72% | 2861 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,199 psi | 80% | 2956 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 54,621 psi | 84% | 2943 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 52,924 psi | 81% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,557 psi | 72% | 2808 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 48,994 psi | 75% | 2877 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 52,663 psi | 81% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,924 psi | 80% | 3002 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 43,569 psi | 67% | 2815 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 41,437 psi | 64% | 2805 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 86% | 45,803 psi | 70% | 2933 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,921 psi | 74% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,052 psi | 75% | 2864 fps | 99.7% |
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 | 135gr | Berger Classic Hybrid Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,163 fps. Accurate 8700 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 59–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 135gr | Berger Classic Hybrid 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.