Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 128gr | Hasler Hunting 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% | 56,855 psi | 88% | 3035 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,868 psi | 84% | 3133 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 56,028 psi | 86% | 3143 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 57,885 psi | 89% | 3127 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,550 psi | 87% | 3143 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 55,593 psi | 86% | 3120 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 56,333 psi | 87% | 3241 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 96% | 55,071 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,261 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,058 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,201 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,782 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,956 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,436 psi | 90% | 3219 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,334 psi | 90% | 3209 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,884 psi | 88% | 3100 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 56,507 psi | 87% | 3127 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,666 psi | 86% | 3130 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 57,058 psi | 88% | 3136 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,232 psi | 88% | 3143 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,405 psi | 85% | 3071 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 58,146 psi | 89% | 3117 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,943 psi | 89% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,317 psi | 85% | 3209 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 58% | 2011 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,637 psi | 86% | 3048 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 86% | 55,013 psi | 85% | 3123 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,885 psi | 89% | 3182 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 58,697 psi | 90% | 3064 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,492 psi | 85% | 3143 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,290 psi | 88% | 3150 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,405 psi | 87% | 3146 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 88% | 55,013 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 60% | 2057 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,202 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,259 psi | 85% | 3150 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 57,972 psi | 89% | 3094 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,203 psi | 88% | 3107 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,826 psi | 87% | 3104 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,753 psi | 86% | 3025 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 57,508 psi | 89% | 3074 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,638 psi | 89% | 3064 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,043 psi | 88% | 3087 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 57,101 psi | 88% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,594 psi | 87% | 3156 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 57,870 psi | 89% | 3150 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 55,840 psi | 86% | 3159 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 57,203 psi | 88% | 3222 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,028 psi | 86% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,508 psi | 89% | 3074 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% | 46,485 psi | 72% | 2864 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 51,242 psi | 79% | 3064 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 48,530 psi | 75% | 3002 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 50,473 psi | 78% | 2999 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 45,774 psi | 70% | 2940 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 36,608 psi | 56% | 2723 fps | 95.7% |
| ADI AR 2218 | 83.6 gr | 94% | 48,443 psi | 75% | 3077 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 31,589 psi | 49% | 2625 fps | 96.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,357 psi | 78% | 2992 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,543 psi | 72% | 2943 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,266 psi | 70% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,450 psi | 61% | 2812 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,909 psi | 80% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 46,528 psi | 72% | 2992 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 50,183 psi | 77% | 3054 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,746 psi | 72% | 2907 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 43,410 psi | 67% | 2874 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 36,927 psi | 57% | 2740 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 46,543 psi | 72% | 2943 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 37,289 psi | 57% | 2746 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 48,341 psi | 74% | 2940 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,369 psi | 73% | 2923 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,346 psi | 84% | 2976 fps | 100% |
| Hodgdon Retumbo | 67.2 gr | 80% | 38,667 psi | 60% | 2861 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 44% | 1801 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,849 psi | 75% | 2923 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 44,628 psi | 69% | 2920 fps | 97.9% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,810 psi | 55% | 2726 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 40,147 psi | 62% | 2733 fps | 99.5% |
| Norma 217 | <<locked>> | 82% | 31,488 psi | 48% | 2621 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 49,705 psi | 76% | 3022 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 45,049 psi | 69% | 2936 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 80% | 40,654 psi | 63% | 2805 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 45% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,145 psi | 59% | 2835 fps | 98.9% |
| ReloadSwiss RS 80 | 76.1 gr | 84% | 40,872 psi | 63% | 2858 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 51,155 psi | 79% | 2976 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 50,125 psi | 77% | 2982 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,777 psi | 77% | 2979 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 52,286 psi | 80% | 2963 fps | 98.9% |
| Somchem S385 | <<locked>> | 80% | 50,415 psi | 78% | 2953 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 44,237 psi | 68% | 2825 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 53,171 psi | 82% | 3018 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 50,096 psi | 77% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,197 psi | 76% | 3015 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 41,104 psi | 63% | 2822 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 41,916 psi | 65% | 2877 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 90% | 49,501 psi | 76% | 3074 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,614 psi | 69% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,615 psi | 72% | 2884 fps | 99.1% |
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 | 128gr | Hasler Hunting. ADI AR 2218 delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,241 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 128.0 gr projectile in 0.264" calls for a 1:8.5 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 | 128gr | Hasler Hunting 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.