Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Frontier PH HPBT bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, 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>> | 86% | 55,782 psi | 86% | 3104 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,696 psi | 89% | 3264 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 86% | 58,711 psi | 90% | 3271 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 56,724 psi | 87% | 3192 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 55,405 psi | 85% | 3202 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 58,581 psi | 90% | 3248 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,969 psi | 85% | 3287 fps | 97.2% |
| ADI AR 2225 | <<locked>> | 98% | 57,638 psi | 89% | 3268 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,971 psi | 88% | 3189 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,376 psi | 87% | 3179 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,927 psi | 86% | 3199 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,885 psi | 89% | 3166 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 58,494 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,592 psi | 84% | 3189 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,985 psi | 88% | 3271 fps | 97.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,869 psi | 88% | 3255 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,869 psi | 86% | 3159 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 55,376 psi | 85% | 3189 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 58,276 psi | 90% | 3258 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,927 psi | 86% | 3199 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 55,912 psi | 86% | 3205 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 58,189 psi | 90% | 3199 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,072 psi | 88% | 3179 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,985 psi | 88% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,754 psi | 89% | 3333 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 58% | 2077 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,711 psi | 90% | 3166 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,247 psi | 90% | 3176 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 57,696 psi | 89% | 3251 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3241 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 57,566 psi | 89% | 3133 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 58,059 psi | 89% | 3271 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,043 psi | 86% | 3215 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,998 psi | 85% | 3205 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 90% | 57,885 psi | 89% | 3202 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 60% | 2126 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,766 psi | 84% | 3251 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 58,407 psi | 90% | 3281 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 57,159 psi | 88% | 3163 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 56,072 psi | 86% | 3169 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,695 psi | 86% | 3169 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 58,711 psi | 90% | 3150 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,550 psi | 87% | 3140 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,536 psi | 87% | 3127 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 55,941 psi | 86% | 3140 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,405 psi | 85% | 3212 fps | 99% |
| Vihtavuori N565 | <<locked>> | 90% | 56,652 psi | 87% | 3209 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 58,653 psi | 90% | 3284 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 55,811 psi | 86% | 3274 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 58,798 psi | 90% | 3261 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,405 psi | 87% | 3140 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% | 45,614 psi | 70% | 2920 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 50,053 psi | 77% | 3123 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 80% | 47,543 psi | 73% | 3058 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 49,574 psi | 76% | 3061 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 44,831 psi | 69% | 2995 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 38,377 psi | 59% | 2838 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 51,053 psi | 79% | 3205 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,734 psi | 47% | 2657 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,966 psi | 77% | 3061 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,501 psi | 76% | 3054 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,614 psi | 70% | 3002 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,382 psi | 68% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,551 psi | 59% | 2864 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,763 psi | 78% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,979 psi | 75% | 3117 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 52,823 psi | 81% | 3179 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 49,052 psi | 75% | 3028 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 42,424 psi | 65% | 2927 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 38,696 psi | 60% | 2854 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,614 psi | 70% | 3002 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 36,318 psi | 56% | 2785 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 47,224 psi | 73% | 2995 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,485 psi | 72% | 2979 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,316 psi | 82% | 3045 fps | 100% |
| Hodgdon Retumbo | 68.8 gr | 80% | 37,594 psi | 58% | 2900 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 44% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,114 psi | 85% | 3107 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,095 psi | 74% | 2986 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,685 psi | 67% | 2976 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,521 psi | 58% | 2838 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 39,160 psi | 60% | 2782 fps | 99% |
| Norma 217 | <<locked>> | 84% | 32,938 psi | 51% | 2730 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 48,588 psi | 75% | 3077 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 43,874 psi | 68% | 2986 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 80% | 39,595 psi | 61% | 2851 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 45% | 1906 fps | 100% |
| ReloadSwiss RS 76 | 73.7 gr | 80% | 37,173 psi | 57% | 2874 fps | 98.1% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,902 psi | 66% | 2976 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 50,183 psi | 77% | 3035 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 49,037 psi | 75% | 3041 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,689 psi | 75% | 3035 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 51,271 psi | 79% | 3022 fps | 98.3% |
| Somchem S385 | <<locked>> | 80% | 49,487 psi | 76% | 3015 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 43,410 psi | 67% | 2881 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 48,994 psi | 75% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,124 psi | 74% | 3074 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 40,161 psi | 62% | 2867 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 43,932 psi | 68% | 2992 fps | 95.4% |
| Vihtavuori N570 | 82.1 gr | 92% | 51,880 psi | 80% | 3196 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,337 psi | 67% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,701 psi | 70% | 2940 fps | 98.6% |
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 .264 | 120gr | Frontier PH HPBT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,333 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,333 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 0.264" calls for a 1:9.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Frontier PH HPBT 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.