Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 108gr | Hasler ARIETE bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Ramshot Grand.
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>> | 88% | 55,100 psi | 85% | 3225 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,913 psi | 88% | 3383 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 88% | 58,102 psi | 89% | 3389 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 86% | 56,289 psi | 87% | 3317 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 90% | 58,784 psi | 90% | 3396 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 57,450 psi | 88% | 3360 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,217 psi | 87% | 3383 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,391 psi | 87% | 3320 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,898 psi | 86% | 3304 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,303 psi | 85% | 3320 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,014 psi | 88% | 3294 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,217 psi | 88% | 3366 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,856 psi | 89% | 3383 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,564 psi | 86% | 3274 fps | 96.4% |
| Bofors RP15 | <<locked>> | 92% | 58,291 psi | 90% | 3373 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 57,232 psi | 88% | 3369 fps | 99.2% |
| Bofors RP5 | <<locked>> | 88% | 55,303 psi | 85% | 3320 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 94% | 55,056 psi | 85% | 3320 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 88% | 57,943 psi | 89% | 3323 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,797 psi | 87% | 3301 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,608 psi | 87% | 3238 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,275 psi | 87% | 3448 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 58% | 2175 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,537 psi | 90% | 3297 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,724 psi | 86% | 3248 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 58,044 psi | 89% | 3297 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,985 psi | 88% | 3373 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,271 psi | 79% | 3271 fps | 98.3% |
| Lovex S065 | <<locked>> | 82% | 58,740 psi | 90% | 3278 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 57,276 psi | 88% | 3274 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,826 psi | 87% | 3255 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,275 psi | 87% | 3297 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 52,344 psi | 81% | 3304 fps | 99.7% |
| Norma MRP | <<locked>> | 86% | 55,230 psi | 85% | 3340 fps | 99.9% |
| Norma URP | <<locked>> | 82% | 57,276 psi | 88% | 3294 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 58,320 psi | 90% | 3396 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,260 psi | 87% | 3297 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,942 psi | 88% | 3317 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 59% | 2221 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,247 psi | 90% | 3369 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,609 psi | 89% | 3438 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,956 psi | 88% | 3386 fps | 98.3% |
| Rottweil R 904 | <<locked>> | 86% | 56,942 psi | 88% | 3287 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 86% | 55,724 psi | 86% | 3297 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,740 psi | 90% | 3278 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,276 psi | 88% | 3274 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,798 psi | 89% | 3228 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,332 psi | 85% | 3294 fps | 99.4% |
| Somchem S361 | <<locked>> | 86% | 58,595 psi | 90% | 3274 fps | 98.7% |
| Somchem S365 | <<locked>> | 84% | 58,639 psi | 90% | 3301 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,028 psi | 86% | 3264 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 58,682 psi | 90% | 3287 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,159 psi | 86% | 3248 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 57,957 psi | 89% | 3287 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,172 psi | 85% | 3268 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,726 psi | 90% | 3406 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,767 psi | 86% | 3320 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 96% | 57,421 psi | 88% | 3392 fps | 97.9% |
| Vihtavuori N570 | <<locked>> | 98% | 58,610 psi | 90% | 3451 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,552 psi | 90% | 3228 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,159 psi | 88% | 3386 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,086 psi | 86% | 3258 fps | 99.4% |
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% | 41,945 psi | 65% | 2966 fps | 98.8% |
| Accurate High Country | <<locked>> | 80% | 46,050 psi | 71% | 3159 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 46,746 psi | 72% | 3163 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 45,861 psi | 71% | 3114 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 44,309 psi | 68% | 3107 fps | 96% |
| ADI AR 2217 | <<locked>> | 88% | 40,408 psi | 62% | 3002 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 34,461 psi | 53% | 2881 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,663 psi | 81% | 3258 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,876 psi | 71% | 3104 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,032 psi | 65% | 3041 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,596 psi | 62% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,085 psi | 54% | 2894 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,021 psi | 71% | 3166 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 52,040 psi | 80% | 3209 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 39,059 psi | 60% | 2963 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 40,364 psi | 62% | 3015 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 42,032 psi | 65% | 3041 fps | 96.7% |
| Hodgdon H1000 | <<locked>> | 84% | 38,392 psi | 59% | 2953 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 43,845 psi | 67% | 3038 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,163 psi | 66% | 3025 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,617 psi | 76% | 3120 fps | 100% |
| Hodgdon Retumbo | 70.4 gr | 82% | 36,796 psi | 57% | 2992 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 43% | 1949 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,517 psi | 79% | 3173 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 52,156 psi | 80% | 3189 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,875 psi | 69% | 3038 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 42,859 psi | 66% | 3077 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 41,640 psi | 64% | 3058 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 55,085 psi | 85% | 3215 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,751 psi | 83% | 3215 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 36,071 psi | 56% | 2825 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 52,446 psi | 81% | 3228 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 36,593 psi | 56% | 2946 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 44,599 psi | 69% | 3123 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 53,577 psi | 82% | 3232 fps | 100% |
| Ramshot Grand | 72.5 gr | 82% | 43,149 psi | 66% | 3094 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 52,518 psi | 81% | 3232 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 35,940 psi | 55% | 2874 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1998 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 54,172 psi | 83% | 3301 fps | 100% |
| ReloadSwiss RS 76 | 73.5 gr | 80% | 33,634 psi | 52% | 2881 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 45,237 psi | 70% | 3150 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,905 psi | 72% | 3091 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 45,455 psi | 70% | 3091 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,085 psi | 85% | 3215 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,751 psi | 83% | 3215 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,172 psi | 83% | 3166 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,107 psi | 69% | 3087 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 47,964 psi | 74% | 3074 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 51,184 psi | 79% | 3179 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,035 psi | 71% | 3071 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 80% | 54,955 psi | 85% | 3225 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 40,045 psi | 62% | 2923 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 54,346 psi | 84% | 3228 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,237 psi | 70% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,324 psi | 68% | 3110 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 84% | 42,293 psi | 65% | 3035 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 49,603 psi | 76% | 3238 fps | 96% |
| Vihtavuori N570 | <<locked>> | 96% | 54,433 psi | 84% | 3376 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,505 psi | 84% | 3166 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,508 psi | 59% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,337 psi | 65% | 2986 fps | 96.8% |
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 62 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 108gr | Hasler ARIETE. Vihtavuori N570 delivers the highest muzzle velocity at 3,451 fps; across all powders the maximum-charge window runs from 2,175 fps to 3,451 fps. ADI AR 2225 gives the best case fill at 100 %, and 62 of the 62 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 108.0 gr projectile in 0.264" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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, ReloadSwiss RS 76, Ramshot Grand rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 108gr | Hasler ARIETE 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.