Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Swift Scirocco bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,274 psi | 87% | 3005 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,637 psi | 89% | 3041 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 53,925 psi | 85% | 3104 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 57,479 psi | 90% | 2995 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,305 psi | 90% | 3100 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 55,158 psi | 86% | 3107 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,414 psi | 77% | 2995 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,237 psi | 69% | 2956 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,537 psi | 90% | 3100 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,795 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,811 psi | 89% | 3087 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,172 psi | 86% | 3100 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,463 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,913 psi | 89% | 3166 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,985 psi | 89% | 3061 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 54,157 psi | 85% | 3084 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 3071 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 55,172 psi | 86% | 3100 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 55,245 psi | 87% | 2986 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 3091 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 54,476 psi | 85% | 3038 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,232 psi | 90% | 3054 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 55,013 psi | 86% | 3038 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,740 psi | 90% | 3084 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,740 psi | 90% | 3012 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,708 psi | 86% | 3212 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,027 psi | 86% | 3077 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 58% | 1906 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,797 psi | 89% | 3025 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,623 psi | 89% | 3009 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,000 psi | 89% | 3031 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,985 psi | 88% | 3022 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 56,637 psi | 89% | 3143 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 57,406 psi | 90% | 3005 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,608 psi | 87% | 3002 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,244 psi | 85% | 3025 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,740 psi | 62% | 2877 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 54,940 psi | 86% | 3123 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,013 psi | 86% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,551 psi | 90% | 3166 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 57,609 psi | 90% | 3084 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,956 psi | 88% | 3094 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,942 psi | 59% | 1952 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,666 psi | 89% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,853 psi | 86% | 3094 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,477 psi | 87% | 3205 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,241 psi | 79% | 3081 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 56,652 psi | 89% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,056 psi | 86% | 3012 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 92% | 56,420 psi | 88% | 3077 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 55,245 psi | 87% | 2986 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,406 psi | 90% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,608 psi | 87% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,304 psi | 88% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,579 psi | 89% | 2959 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,985 psi | 88% | 3074 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 56,144 psi | 88% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,434 psi | 88% | 2999 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 55,317 psi | 87% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,000 psi | 89% | 3048 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 57,522 psi | 90% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,797 psi | 89% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,376 psi | 88% | 3025 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 55,941 psi | 88% | 3022 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,129 psi | 86% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,752 psi | 86% | 3117 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 54,592 psi | 86% | 3094 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3087 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,217 psi | 88% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,708 psi | 86% | 3041 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,114 psi | 85% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,826 psi | 89% | 3041 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 34,490 psi | 54% | 2605 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 46,209 psi | 72% | 2871 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 43,584 psi | 68% | 2904 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 53,954 psi | 85% | 2943 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,363 psi | 60% | 2733 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 42,018 psi | 66% | 2848 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 40,553 psi | 64% | 2808 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 90% | 31,952 psi | 50% | 2641 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,135 psi | 69% | 2874 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,024 psi | 80% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,537 psi | 60% | 2733 fps | 96.2% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,840 psi | 58% | 2733 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,098 psi | 52% | 2638 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,761 psi | 45% | 2536 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,187 psi | 57% | 2776 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,343 psi | 79% | 2943 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 36,550 psi | 57% | 2723 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 39,262 psi | 62% | 2822 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 36,840 psi | 58% | 2733 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 48,849 psi | 77% | 2874 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 38,798 psi | 61% | 2772 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 47,645 psi | 75% | 2917 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 50,212 psi | 79% | 2936 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 41,989 psi | 66% | 2792 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,092 psi | 69% | 2838 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,669 psi | 65% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,301 psi | 54% | 2743 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 47,311 psi | 74% | 2946 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 44% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,135 psi | 69% | 2799 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,198 psi | 79% | 2900 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 43,918 psi | 69% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,857 psi | 64% | 2733 fps | 95% |
| IMR 7828 SSC | <<locked>> | 86% | 40,480 psi | 63% | 2825 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,776 psi | 75% | 2848 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 45,992 psi | 72% | 2835 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 29,689 psi | 47% | 2477 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 44,179 psi | 69% | 2838 fps | 97.6% |
| Norma 217 | <<locked>> | 94% | 32,474 psi | 51% | 2687 fps | 95.2% |
| Norma MRP | 62.9 gr | 80% | 35,911 psi | 56% | 2740 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 45,194 psi | 71% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 40,219 psi | 63% | 2831 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 44,019 psi | 69% | 2851 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 33,330 psi | 52% | 2638 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 45% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,180 psi | 72% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,251 psi | 69% | 2910 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,359 psi | 52% | 2717 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,279 psi | 68% | 2943 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 53,055 psi | 83% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,784 psi | 62% | 2713 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 37,797 psi | 59% | 2717 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 48,849 psi | 77% | 2874 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,776 psi | 75% | 2848 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,992 psi | 72% | 2835 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,997 psi | 83% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,673 psi | 73% | 2792 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,463 psi | 59% | 2710 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 52,939 psi | 83% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,294 psi | 68% | 2762 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 42,163 psi | 66% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,348 psi | 60% | 2700 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 50,575 psi | 79% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,702 psi | 73% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,578 psi | 56% | 2625 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 46,079 psi | 72% | 2854 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,115 psi | 58% | 2717 fps | 99.6% |
| Vihtavuori N560 | 66 gr | 84% | 41,452 psi | 65% | 2854 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 41,742 psi | 65% | 2848 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 44,643 psi | 70% | 2956 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,832 psi | 72% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,877 psi | 75% | 2923 fps | 99.5% |
| Winchester StaBALL HD | 62.2 gr | 80% | 29,341 psi | 46% | 2648 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,579 psi | 59% | 2680 fps | 95.9% |
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 79 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | Swift Scirocco. Hodgdon Retumbo delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,212 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.