Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | CutEdge MTH bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO and Accurate High Country.
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>> | 94% | 55,883 psi | 88% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,305 psi | 90% | 2966 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,012 psi | 85% | 3035 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 54,926 psi | 86% | 3038 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 54,665 psi | 86% | 2976 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 56,173 psi | 88% | 3041 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,328 psi | 79% | 2940 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,788 psi | 70% | 2897 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,752 psi | 86% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,796 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,696 psi | 90% | 3018 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,130 psi | 88% | 3035 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,493 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,884 psi | 89% | 3064 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,969 psi | 85% | 3035 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,740 psi | 90% | 2999 fps | 97.5% |
| Bofors RP15 | <<locked>> | 96% | 55,042 psi | 86% | 3015 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,692 psi | 83% | 3009 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 56,130 psi | 88% | 3035 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 55,811 psi | 87% | 2910 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 3025 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 55,317 psi | 87% | 2969 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,447 psi | 85% | 2927 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 55,883 psi | 88% | 2972 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,897 psi | 86% | 2956 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,868 psi | 86% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3143 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,970 psi | 88% | 3009 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,144 psi | 58% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,682 psi | 90% | 2956 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,334 psi | 90% | 2936 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,522 psi | 90% | 2953 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,956 psi | 89% | 2956 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 53,940 psi | 85% | 3015 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,277 psi | 63% | 2795 fps | 96.7% |
| Lovex S065 | <<locked>> | 84% | 54,433 psi | 85% | 2881 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,231 psi | 88% | 2930 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,158 psi | 86% | 2959 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 40,379 psi | 63% | 2822 fps | 98.8% |
| Norma MRP | <<locked>> | 92% | 56,014 psi | 88% | 3054 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,782 psi | 87% | 2949 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,839 psi | 86% | 3038 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 54,737 psi | 86% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,101 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 60% | 1890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,377 psi | 90% | 2989 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,144 psi | 88% | 3025 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3143 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3025 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 82% | 57,116 psi | 90% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,738 psi | 87% | 2943 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 92% | 57,246 psi | 90% | 3009 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 55,811 psi | 87% | 2910 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,433 psi | 85% | 2881 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,231 psi | 88% | 2930 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,029 psi | 89% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,203 psi | 90% | 2887 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,811 psi | 89% | 3002 fps | 99.9% |
| Somchem S355 | <<locked>> | 82% | 56,884 psi | 89% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,232 psi | 90% | 2936 fps | 99% |
| Somchem S365 | <<locked>> | 88% | 56,304 psi | 88% | 2949 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,725 psi | 90% | 2976 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 54,462 psi | 85% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,638 psi | 90% | 2940 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,334 psi | 90% | 2959 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 56,739 psi | 89% | 2946 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,767 psi | 87% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,811 psi | 87% | 3051 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 55,608 psi | 87% | 3028 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,388 psi | 82% | 3028 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,072 psi | 89% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,535 psi | 87% | 2969 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,390 psi | 87% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,911 psi | 84% | 2917 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% | 34,476 psi | 54% | 2539 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 46,485 psi | 73% | 2795 fps | 100% |
| Accurate High Country | 62.1 gr | 80% | 37,666 psi | 59% | 2707 fps | 95.4% |
| Accurate MAGPRO | 66.4 gr | 84% | 41,046 psi | 64% | 2772 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 38,899 psi | 61% | 2674 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 39,784 psi | 62% | 2726 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 92% | 38,276 psi | 60% | 2687 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 29,994 psi | 47% | 2520 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,889 psi | 70% | 2808 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,851 psi | 81% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,885 psi | 61% | 2671 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,693 psi | 54% | 2608 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,301 psi | 52% | 2569 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,877 psi | 45% | 2477 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,651 psi | 57% | 2713 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 47,834 psi | 75% | 2822 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 34,432 psi | 54% | 2598 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 37,231 psi | 58% | 2703 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 34,693 psi | 54% | 2608 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 49,182 psi | 77% | 2802 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 36,535 psi | 57% | 2651 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 48,428 psi | 76% | 2854 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 51,010 psi | 80% | 2867 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 39,682 psi | 62% | 2671 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,756 psi | 65% | 2717 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,192 psi | 66% | 2684 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 32,213 psi | 50% | 2618 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 48,167 psi | 75% | 2881 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,701 psi | 70% | 2736 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,662 psi | 79% | 2828 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,222 psi | 69% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,769 psi | 61% | 2615 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 38,261 psi | 60% | 2703 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,507 psi | 59% | 2730 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,008 psi | 75% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,441 psi | 73% | 2766 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 29,602 psi | 46% | 2411 fps | 96.3% |
| Norma 204 | <<locked>> | 80% | 44,875 psi | 70% | 2779 fps | 98.3% |
| Norma 217 | <<locked>> | 92% | 30,618 psi | 48% | 2566 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 36,303 psi | 57% | 2677 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 45,788 psi | 72% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,855 psi | 59% | 2707 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 44,701 psi | 70% | 2785 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 31,198 psi | 49% | 2516 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 1686 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,702 psi | 73% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,947 psi | 70% | 2841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,212 psi | 49% | 2589 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,741 psi | 64% | 2815 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 53,635 psi | 84% | 2854 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,263 psi | 63% | 2657 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 38,247 psi | 60% | 2654 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 49,182 psi | 77% | 2802 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,008 psi | 75% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,441 psi | 73% | 2766 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,606 psi | 84% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,934 psi | 74% | 2723 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,927 psi | 59% | 2651 fps | 96.8% |
| Somchem S355 | <<locked>> | 80% | 53,287 psi | 84% | 2848 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,857 psi | 64% | 2641 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 42,786 psi | 67% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,711 psi | 61% | 2635 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 51,184 psi | 80% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,137 psi | 74% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,446 psi | 52% | 2507 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,470 psi | 73% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,434 psi | 59% | 2648 fps | 99.9% |
| Vihtavuori N560 | 63.7 gr | 82% | 39,305 psi | 62% | 2733 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 88% | 39,204 psi | 61% | 2720 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 42,250 psi | 66% | 2831 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,296 psi | 73% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,428 psi | 76% | 2854 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,559 psi | 46% | 2592 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,346 psi | 55% | 2559 fps | 95.8% |
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 | 160gr | CutEdge MTH. Hodgdon Retumbo delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,143 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 58–90 %, leaving at least 10 % headroom. The 160.0 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 2218, ADI AR 2225 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. Vihtavuori N560, Accurate MAGPRO, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | CutEdge MTH they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron 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.