Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 130gr | Swift Scirocco bullet and 51 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 Vihtavuori N570.
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% | 58,291 psi | 90% | 3041 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 56,362 psi | 87% | 3140 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 57,493 psi | 88% | 3150 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 82% | 55,230 psi | 85% | 3064 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 58,030 psi | 89% | 3146 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 57,363 psi | 88% | 3130 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,972 psi | 89% | 3251 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 96% | 56,884 psi | 88% | 3150 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,535 psi | 85% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 58,653 psi | 90% | 3114 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 58,537 psi | 90% | 3140 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,695 psi | 87% | 3041 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,334 psi | 88% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,537 psi | 89% | 3127 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,941 psi | 86% | 3156 fps | 97.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,028 psi | 86% | 3146 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 58,073 psi | 89% | 3100 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 57,928 psi | 89% | 3127 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,174 psi | 88% | 3133 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 58,537 psi | 90% | 3140 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 58,769 psi | 90% | 3150 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,536 psi | 87% | 3071 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,666 psi | 86% | 3058 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,101 psi | 88% | 3212 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,985 psi | 58% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,681 psi | 87% | 3048 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 56,536 psi | 87% | 3127 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,709 psi | 86% | 3123 fps | 99.8% |
| Lovex S071 | <<locked>> | 90% | 56,478 psi | 87% | 3012 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,319 psi | 88% | 3153 fps | 100% |
| Norma MRP | <<locked>> | 84% | 58,784 psi | 90% | 3153 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 58,030 psi | 89% | 3156 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,521 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 60% | 2047 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,899 psi | 89% | 3196 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,000 psi | 88% | 3159 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 82% | 55,593 psi | 86% | 3031 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 58,436 psi | 90% | 3107 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,663 psi | 80% | 3002 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 58,059 psi | 89% | 3104 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,927 psi | 88% | 3022 fps | 99.5% |
| Somchem S385 | <<locked>> | 82% | 55,201 psi | 85% | 3018 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,274 psi | 85% | 3005 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 58,305 psi | 90% | 3091 fps | 97% |
| Vihtavuori N555 | <<locked>> | 84% | 58,407 psi | 90% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 58,044 psi | 89% | 3159 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,521 psi | 85% | 3091 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 57,537 psi | 89% | 3166 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 92% | 54,824 psi | 84% | 3159 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,624 psi | 89% | 3130 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 58,624 psi | 90% | 3071 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% | 47,630 psi | 73% | 2864 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 52,489 psi | 81% | 3068 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 49,893 psi | 77% | 3009 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 51,619 psi | 79% | 3002 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 46,920 psi | 72% | 2943 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 35,128 psi | 54% | 2667 fps | 95.3% |
| ADI AR 2218 | 82.8 gr | 92% | 46,340 psi | 71% | 3012 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 32,474 psi | 50% | 2631 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,953 psi | 80% | 2999 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,503 psi | 79% | 2992 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,674 psi | 73% | 2946 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,427 psi | 71% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,611 psi | 63% | 2815 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,476 psi | 82% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 48,066 psi | 74% | 3005 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 94% | 48,153 psi | 74% | 2995 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,759 psi | 69% | 2848 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 44,527 psi | 69% | 2877 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 38,029 psi | 59% | 2749 fps | 96.5% |
| Bofors RP5 | <<locked>> | 80% | 47,674 psi | 73% | 2946 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 38,276 psi | 59% | 2749 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 80% | 49,414 psi | 76% | 2943 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,457 psi | 75% | 2923 fps | 98.3% |
| Hodgdon Retumbo | 68 gr | 80% | 39,813 psi | 61% | 2867 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 44% | 1791 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,835 psi | 77% | 2927 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 45,832 psi | 71% | 2930 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 37,043 psi | 57% | 2736 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 41,060 psi | 63% | 2733 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 30,400 psi | 47% | 2569 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 50,952 psi | 78% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,514 psi | 72% | 2949 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 41,974 psi | 65% | 2812 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,269 psi | 45% | 1834 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,436 psi | 61% | 2844 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 39,146 psi | 60% | 2795 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,243 psi | 80% | 2976 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 51,300 psi | 79% | 2986 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 48,254 psi | 74% | 2936 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,952 psi | 78% | 2982 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 53,287 psi | 82% | 2963 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 51,503 psi | 79% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,281 psi | 70% | 2825 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 50,981 psi | 78% | 2959 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,358 psi | 79% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,386 psi | 78% | 3022 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 42,192 psi | 65% | 2828 fps | 97.1% |
| Vihtavuori N568 | <<locked>> | 84% | 43,221 psi | 67% | 2887 fps | 96.1% |
| Vihtavuori N570 | 77.6 gr | 88% | 47,514 psi | 73% | 3012 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,050 psi | 71% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,863 psi | 74% | 2887 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 51 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 130gr | Swift Scirocco. ADI AR 2218 delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,251 fps. Hodgdon TrailBoss 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 130.0 gr projectile in 0.264" calls for a 1:8.5 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 130gr | Swift Scirocco 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.