Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 145gr | Hasler ARIETE bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 55,492 psi | 87% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,985 psi | 89% | 3097 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 57,087 psi | 89% | 3219 fps | 99% |
| Accurate MAGPRO | <<locked>> | 94% | 54,201 psi | 85% | 3153 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 54,882 psi | 86% | 3005 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,331 psi | 85% | 3100 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 55,666 psi | 87% | 3159 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,412 psi | 73% | 2976 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,249 psi | 65% | 2933 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,607 psi | 86% | 3094 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,607 psi | 86% | 3094 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,999 psi | 88% | 3028 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,433 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,550 psi | 87% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,566 psi | 90% | 3146 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,390 psi | 87% | 3153 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,608 psi | 89% | 3127 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,072 psi | 89% | 3219 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,534 psi | 85% | 3136 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 57,058 psi | 89% | 3048 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,979 psi | 75% | 3051 fps | 97.8% |
| Bofors RP5 | <<locked>> | 96% | 55,390 psi | 87% | 3153 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 56,043 psi | 88% | 3045 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,387 psi | 81% | 3077 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 82% | 57,072 psi | 89% | 3068 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,288 psi | 87% | 3100 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 54,476 psi | 85% | 3054 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 55,811 psi | 87% | 3097 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,549 psi | 85% | 3074 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,607 psi | 86% | 3022 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,198 psi | 80% | 3192 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 86% | 55,825 psi | 87% | 3140 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 58% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,667 psi | 90% | 3084 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,653 psi | 90% | 3071 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 57,261 psi | 90% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,927 psi | 89% | 3081 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 98% | 57,392 psi | 90% | 3199 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 54,592 psi | 86% | 3012 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,202 psi | 88% | 3061 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,721 psi | 83% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,984 psi | 86% | 3084 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 36,521 psi | 57% | 2838 fps | 96.5% |
| Norma MRP | <<locked>> | 94% | 55,259 psi | 87% | 3176 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 55,564 psi | 87% | 3081 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,157 psi | 85% | 3156 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 54,346 psi | 85% | 3084 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,463 psi | 88% | 3150 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1978 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,000 psi | 89% | 3058 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,940 psi | 86% | 3104 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,072 psi | 89% | 3123 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,622 psi | 87% | 3156 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 3186 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 57,159 psi | 90% | 3045 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,637 psi | 87% | 3068 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 94% | 56,797 psi | 89% | 3130 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 56,043 psi | 88% | 3045 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,592 psi | 86% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,202 psi | 88% | 3061 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,259 psi | 87% | 3051 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,435 psi | 90% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,464 psi | 90% | 3018 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,347 psi | 88% | 3127 fps | 99.4% |
| Somchem S355 | <<locked>> | 84% | 56,840 psi | 89% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,450 psi | 90% | 3061 fps | 98.2% |
| Somchem S365 | <<locked>> | 90% | 55,680 psi | 87% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,276 psi | 90% | 3100 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 54,665 psi | 86% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,479 psi | 90% | 3074 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,043 psi | 89% | 3081 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 56,507 psi | 89% | 3077 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,984 psi | 86% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,230 psi | 87% | 3169 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,781 psi | 86% | 3143 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,246 psi | 90% | 3028 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,288 psi | 87% | 3100 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,679 psi | 84% | 3205 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,624 psi | 90% | 3100 fps | 99.5% |
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% | 31,647 psi | 50% | 2575 fps | 96% |
| Accurate 4350 | <<locked>> | 80% | 43,004 psi | 67% | 2858 fps | 99.8% |
| Accurate High Country | <<locked>> | 84% | 39,885 psi | 63% | 2877 fps | 95% |
| Accurate MAGPRO | 71.5 gr | 90% | 46,833 psi | 73% | 3015 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 51,430 psi | 81% | 2953 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,754 psi | 61% | 2785 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 42,322 psi | 66% | 2897 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 40,582 psi | 64% | 2848 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 94% | 33,678 psi | 53% | 2730 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,015 psi | 61% | 2785 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,015 psi | 61% | 2785 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,475 psi | 82% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,452 psi | 65% | 2871 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,921 psi | 75% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,624 psi | 61% | 2779 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 36,695 psi | 57% | 2772 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,574 psi | 48% | 2615 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,558 psi | 45% | 2569 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,257 psi | 52% | 2749 fps | 98.1% |
| Bofors RP15 | <<locked>> | 88% | 38,986 psi | 61% | 2828 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 53,098 psi | 83% | 2989 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 38,986 psi | 61% | 2858 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 36,695 psi | 57% | 2772 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 46,267 psi | 73% | 2871 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 38,725 psi | 61% | 2805 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 53,403 psi | 84% | 3012 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,078 psi | 71% | 2917 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 47,616 psi | 75% | 2930 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 45,237 psi | 71% | 2904 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,411 psi | 70% | 2887 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,957 psi | 61% | 2746 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,303 psi | 57% | 2844 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 44,425 psi | 70% | 2933 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 43% | 1726 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,872 psi | 66% | 2799 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,805 psi | 75% | 2900 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 41,089 psi | 64% | 2805 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,976 psi | 69% | 2841 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 43,482 psi | 68% | 2936 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 45,150 psi | 71% | 2844 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 43,308 psi | 68% | 2828 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 31,038 psi | 49% | 2559 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 41,582 psi | 65% | 2828 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 34,055 psi | 53% | 2772 fps | 95.4% |
| Norma MRP | 62.4 gr | 80% | 33,228 psi | 52% | 2710 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 42,395 psi | 66% | 2848 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 40,263 psi | 63% | 2874 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 41,321 psi | 65% | 2841 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 35,665 psi | 56% | 2740 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 44% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,229 psi | 83% | 2995 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,952 psi | 80% | 3045 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,134 psi | 68% | 2881 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,495 psi | 65% | 2897 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,199 psi | 52% | 2746 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 49,995 psi | 78% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,844 psi | 67% | 2828 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 37,724 psi | 59% | 2759 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 46,267 psi | 73% | 2871 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,150 psi | 71% | 2844 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 43,308 psi | 68% | 2828 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,532 psi | 81% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,531 psi | 79% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,121 psi | 69% | 2789 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,391 psi | 59% | 2753 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,067 psi | 78% | 2930 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 43,743 psi | 69% | 2815 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 39,334 psi | 62% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,708 psi | 56% | 2680 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 47,834 psi | 75% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,961 psi | 69% | 2848 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,462 psi | 56% | 2667 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 43,337 psi | 68% | 2848 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 34,156 psi | 54% | 2690 fps | 98.8% |
| Vihtavuori N560 | 68.6 gr | 88% | 44,585 psi | 70% | 2969 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 92% | 41,263 psi | 65% | 2881 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,033 psi | 67% | 2805 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,078 psi | 71% | 2917 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,919 psi | 42% | 2605 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,579 psi | 59% | 2723 fps | 95.4% |
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 80 powders for 7 x 66 SE v. Hofe loaded with the .284 | 145gr | Hasler ARIETE. Accurate High Country delivers the highest muzzle velocity at 3,219 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,219 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:9.0 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 145gr | 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.