Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 127gr | RWS Kegelspitz 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, Vihtavuori N570 and Hodgdon Retumbo.
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% | 55,216 psi | 85% | 3018 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 57,058 psi | 88% | 3179 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 58,262 psi | 90% | 3189 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 55,840 psi | 86% | 3104 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 58,697 psi | 90% | 3186 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 58,247 psi | 90% | 3166 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,723 psi | 84% | 3215 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 96% | 57,957 psi | 89% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,521 psi | 85% | 3091 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,477 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,435 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 58,392 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 58,465 psi | 90% | 3166 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,956 psi | 88% | 3196 fps | 98% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,145 psi | 88% | 3186 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 58,755 psi | 90% | 3140 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 58,581 psi | 90% | 3166 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 58,088 psi | 89% | 3176 fps | 99.9% |
| Bofors RP5 | <<locked>> | 84% | 55,477 psi | 85% | 3117 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,695 psi | 86% | 3127 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,159 psi | 88% | 3110 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,304 psi | 87% | 3097 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,972 psi | 89% | 3255 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 59% | 2034 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,305 psi | 88% | 3087 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 57,203 psi | 88% | 3166 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,724 psi | 87% | 3166 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 57,159 psi | 88% | 3051 fps | 100% |
| Norma 217 | <<locked>> | 98% | 58,204 psi | 90% | 3192 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,448 psi | 85% | 3127 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,723 psi | 84% | 3127 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 88% | 57,421 psi | 88% | 3117 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 60% | 2077 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,795 psi | 84% | 3169 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 58,160 psi | 90% | 3202 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 56,144 psi | 86% | 3071 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 82% | 55,477 psi | 85% | 3087 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,750 psi | 81% | 3045 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,114 psi | 85% | 3081 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 57,638 psi | 89% | 3064 fps | 99.5% |
| Somchem S385 | <<locked>> | 82% | 55,724 psi | 86% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,840 psi | 86% | 3045 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,332 psi | 85% | 3061 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 82% | 55,332 psi | 85% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 58,668 psi | 90% | 3196 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 56,246 psi | 87% | 3127 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 58,291 psi | 90% | 3205 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 92% | 55,883 psi | 86% | 3202 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 58,595 psi | 90% | 3173 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,448 psi | 85% | 3048 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% | 48,225 psi | 74% | 2900 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 53,243 psi | 82% | 3107 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 50,546 psi | 78% | 3048 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 52,257 psi | 80% | 3041 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 47,718 psi | 73% | 2982 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 35,534 psi | 55% | 2700 fps | 95.2% |
| ADI AR 2218 | 85.1 gr | 92% | 47,123 psi | 73% | 3051 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 32,967 psi | 51% | 2667 fps | 97.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,069 psi | 80% | 3031 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,472 psi | 75% | 2986 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,152 psi | 73% | 2913 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,263 psi | 64% | 2851 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 54,230 psi | 83% | 3100 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 48,994 psi | 75% | 3045 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 94% | 49,124 psi | 76% | 3031 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,295 psi | 70% | 2884 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 44,962 psi | 69% | 2913 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 38,580 psi | 59% | 2782 fps | 96.4% |
| Bofors RP5 | <<locked>> | 80% | 48,472 psi | 75% | 2986 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 38,812 psi | 60% | 2785 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 80% | 49,980 psi | 77% | 2982 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,182 psi | 76% | 2966 fps | 98.4% |
| Hodgdon Retumbo | 69.9 gr | 80% | 40,451 psi | 62% | 2907 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 44% | 1818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,415 psi | 78% | 2963 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 46,456 psi | 71% | 2963 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 37,666 psi | 58% | 2772 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 41,553 psi | 64% | 2766 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 30,835 psi | 47% | 2598 fps | 95% |
| Norma MRP | <<locked>> | 80% | 51,735 psi | 80% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,108 psi | 73% | 2982 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 42,627 psi | 66% | 2851 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 45% | 1864 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,059 psi | 62% | 2881 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 39,871 psi | 61% | 2835 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 52,663 psi | 81% | 3012 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 51,938 psi | 80% | 3025 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 49,182 psi | 76% | 2976 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,590 psi | 79% | 3018 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 53,838 psi | 83% | 2999 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 52,286 psi | 80% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,847 psi | 71% | 2864 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 51,750 psi | 80% | 2999 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 51,880 psi | 80% | 2995 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,097 psi | 79% | 3058 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 42,888 psi | 66% | 2864 fps | 97.1% |
| Vihtavuori N568 | <<locked>> | 84% | 43,772 psi | 67% | 2920 fps | 96% |
| Vihtavuori N570 | 79.8 gr | 88% | 48,399 psi | 74% | 3054 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,934 psi | 72% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,399 psi | 74% | 2923 fps | 99.4% |
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 | 127gr | RWS Kegelspitz. Hodgdon Retumbo delivers the highest muzzle velocity at 3,255 fps; across all powders the maximum-charge window runs from 2,034 fps to 3,255 fps. Hodgdon TrailBoss 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 127.0 gr projectile in 0.264" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, SNPE Vectan SP 13 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, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 127gr | RWS Kegelspitz 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.