Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 152gr | Hasler ARIETE bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 and Winchester StaBALL HD.
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% | 57,174 psi | 90% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,824 psi | 86% | 2999 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,071 psi | 86% | 3120 fps | 99% |
| Accurate MAGPRO | <<locked>> | 94% | 56,028 psi | 88% | 3123 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 56,101 psi | 88% | 2959 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,811 psi | 87% | 3061 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 96% | 57,305 psi | 90% | 3123 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2949 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,424 psi | 66% | 2904 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,363 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,825 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,072 psi | 89% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,317 psi | 87% | 3048 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,130 psi | 90% | 3117 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,520 psi | 85% | 3028 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,824 psi | 84% | 3091 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,868 psi | 86% | 3120 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,550 psi | 87% | 3018 fps | 96.4% |
| Bofors RP15 | <<locked>> | 98% | 56,217 psi | 88% | 3100 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 3022 fps | 98.5% |
| Bofors RP5 | <<locked>> | 96% | 57,130 psi | 90% | 3117 fps | 99.7% |
| Bofors RP7 | <<locked>> | 86% | 57,435 psi | 90% | 3002 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 3048 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 86% | 56,666 psi | 89% | 3054 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 55,680 psi | 87% | 3012 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 94% | 57,348 psi | 90% | 3061 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,057 psi | 88% | 3041 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,014 psi | 88% | 2972 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,736 psi | 83% | 3159 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 57,479 psi | 90% | 3097 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,564 psi | 87% | 2989 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,390 psi | 87% | 2969 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 55,187 psi | 86% | 2989 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,650 psi | 86% | 2982 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 96% | 55,172 psi | 86% | 3100 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 55,927 psi | 88% | 2969 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,479 psi | 90% | 3015 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,331 psi | 85% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,623 psi | 89% | 3048 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 37,927 psi | 59% | 2822 fps | 97.6% |
| Norma MRP | <<locked>> | 94% | 57,116 psi | 90% | 3140 fps | 100% |
| Norma URP | <<locked>> | 88% | 56,956 psi | 89% | 3035 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,753 psi | 87% | 3117 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 88% | 56,043 psi | 88% | 3045 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,099 psi | 85% | 3051 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,753 psi | 59% | 1932 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,797 psi | 89% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,882 psi | 86% | 3025 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,334 psi | 90% | 3110 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 3159 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,211 psi | 76% | 3028 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,868 psi | 86% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,985 psi | 89% | 3028 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 54,766 psi | 86% | 3035 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 57,435 psi | 90% | 3002 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,927 psi | 88% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,479 psi | 90% | 3015 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,768 psi | 89% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,143 psi | 86% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,216 psi | 87% | 2920 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,331 psi | 85% | 3028 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 54,781 psi | 86% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,085 psi | 86% | 2963 fps | 98.2% |
| Somchem S365 | <<locked>> | 90% | 57,551 psi | 90% | 3038 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,114 psi | 86% | 3002 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 55,999 psi | 88% | 2910 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,332 psi | 87% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,868 psi | 86% | 2986 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 54,273 psi | 85% | 2979 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,652 psi | 89% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,985 psi | 89% | 3136 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 3107 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,603 psi | 78% | 3041 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,781 psi | 86% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,927 psi | 89% | 3061 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,101 psi | 88% | 3169 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,303 psi | 87% | 3002 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% | 32,735 psi | 51% | 2549 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 44,353 psi | 70% | 2822 fps | 100% |
| Accurate High Country | 63.4 gr | 82% | 38,363 psi | 60% | 2785 fps | 95% |
| Accurate MAGPRO | <<locked>> | 88% | 45,136 psi | 71% | 2923 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 52,794 psi | 83% | 2907 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,202 psi | 58% | 2694 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 40,538 psi | 64% | 2802 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 94% | 39,001 psi | 61% | 2759 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 92% | 32,619 psi | 51% | 2651 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,751 psi | 84% | 2927 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,844 psi | 67% | 2835 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,487 psi | 78% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,144 psi | 58% | 2687 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,375 psi | 55% | 2684 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,575 psi | 49% | 2585 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,514 psi | 43% | 2484 fps | 95% |
| Alliant Reloder-26 | 63.8 gr | 80% | 34,592 psi | 54% | 2726 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,315 psi | 82% | 2963 fps | 95.6% |
| Bofors RP15 | <<locked>> | 86% | 37,623 psi | 59% | 2736 fps | 95.9% |
| Bofors RP30 | <<locked>> | 92% | 37,623 psi | 59% | 2769 fps | 95.3% |
| Bofors RP5 | <<locked>> | 82% | 35,375 psi | 55% | 2684 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 47,369 psi | 74% | 2831 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 37,362 psi | 59% | 2720 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 46,383 psi | 73% | 2881 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 49,066 psi | 77% | 2897 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 86% | 43,584 psi | 68% | 2812 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,583 psi | 67% | 2792 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,277 psi | 63% | 2713 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 35,128 psi | 55% | 2756 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 45,934 psi | 72% | 2904 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 43% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,960 psi | 67% | 2762 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,892 psi | 77% | 2861 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 42,279 psi | 66% | 2769 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 42,308 psi | 66% | 2749 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 41,727 psi | 65% | 2841 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 46,224 psi | 72% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 44,628 psi | 70% | 2795 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 30,023 psi | 47% | 2477 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 42,801 psi | 67% | 2795 fps | 97.3% |
| Norma 217 | <<locked>> | 96% | 33,083 psi | 52% | 2694 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 34,403 psi | 54% | 2687 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 43,830 psi | 69% | 2815 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 38,667 psi | 61% | 2782 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 42,554 psi | 67% | 2805 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 34,301 psi | 54% | 2654 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 44% | 1729 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,663 psi | 83% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,338 psi | 69% | 2844 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,815 psi | 67% | 2864 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,894 psi | 50% | 2657 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 44,599 psi | 70% | 2959 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 51,517 psi | 81% | 2890 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,133 psi | 64% | 2733 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 36,434 psi | 57% | 2671 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 47,369 psi | 74% | 2831 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,224 psi | 72% | 2802 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 44,628 psi | 70% | 2795 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,924 psi | 83% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,808 psi | 81% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,179 psi | 71% | 2749 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,114 psi | 57% | 2664 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 51,300 psi | 80% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,018 psi | 66% | 2723 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 40,669 psi | 64% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,970 psi | 58% | 2654 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 80% | 49,255 psi | 77% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,179 psi | 71% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 34,156 psi | 54% | 2579 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 44,556 psi | 70% | 2812 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 35,346 psi | 55% | 2664 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 86% | 42,917 psi | 67% | 2874 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 90% | 39,827 psi | 62% | 2792 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 46,035 psi | 72% | 2972 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,309 psi | 69% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,383 psi | 73% | 2881 fps | 99.3% |
| Winchester StaBALL HD | 61.2 gr | 80% | 27,876 psi | 44% | 2589 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,187 psi | 57% | 2635 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 83 powders for 7 x 66 SE v. Hofe loaded with the .284 | 152gr | Hasler ARIETE. Winchester StaBALL HD delivers the highest muzzle velocity at 3,169 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,169 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 152.0 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. Accurate High Country, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 152gr | Hasler ARIETE 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.