Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 155gr | Frontier PH HPFB bullet and 76 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% | 56,347 psi | 88% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,566 psi | 90% | 3005 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 53,969 psi | 85% | 3071 fps | 99% |
| Accurate MAGPRO | <<locked>> | 92% | 54,839 psi | 86% | 3074 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 54,520 psi | 85% | 3009 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 55,970 psi | 88% | 3074 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2969 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,846 psi | 70% | 2930 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,853 psi | 86% | 3009 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,665 psi | 86% | 3009 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,724 psi | 87% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,201 psi | 85% | 2999 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,043 psi | 88% | 3071 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,363 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,608 psi | 89% | 3100 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,896 psi | 84% | 3071 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,740 psi | 90% | 3031 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 55,216 psi | 87% | 3054 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,634 psi | 82% | 3041 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 56,043 psi | 88% | 3071 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,927 psi | 88% | 2949 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 3064 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 55,317 psi | 87% | 3005 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,433 psi | 85% | 2963 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 55,999 psi | 88% | 3012 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,781 psi | 86% | 2992 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,911 psi | 86% | 2927 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,463 psi | 87% | 3179 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,825 psi | 87% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 58% | 1877 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,609 psi | 90% | 2989 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,537 psi | 90% | 2976 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,215 psi | 85% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,855 psi | 89% | 2992 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 53,998 psi | 85% | 3051 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,408 psi | 63% | 2828 fps | 96.4% |
| Lovex S065 | <<locked>> | 84% | 54,592 psi | 86% | 2917 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,362 psi | 88% | 2969 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2989 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,100 psi | 86% | 2995 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 40,553 psi | 64% | 2854 fps | 98.5% |
| Norma MRP | <<locked>> | 92% | 56,115 psi | 88% | 3094 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,840 psi | 88% | 2989 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,592 psi | 86% | 3071 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 54,723 psi | 86% | 2995 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,072 psi | 89% | 3064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1916 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,667 psi | 90% | 3031 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,912 psi | 88% | 3061 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 3176 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 3061 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 57,392 psi | 90% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,666 psi | 87% | 2979 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 57,174 psi | 90% | 3045 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,927 psi | 88% | 2949 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,592 psi | 86% | 2917 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,362 psi | 88% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,116 psi | 90% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,348 psi | 90% | 2923 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,724 psi | 89% | 3038 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 57,101 psi | 89% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,392 psi | 90% | 2972 fps | 98.7% |
| Somchem S365 | <<locked>> | 88% | 56,318 psi | 88% | 2989 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,143 psi | 85% | 2959 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 54,621 psi | 86% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,638 psi | 90% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,493 psi | 90% | 2995 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,811 psi | 89% | 2986 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,912 psi | 88% | 3012 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,898 psi | 88% | 3091 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 55,608 psi | 87% | 3064 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,431 psi | 82% | 3064 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,188 psi | 90% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,550 psi | 87% | 3009 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,361 psi | 87% | 3123 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,867 psi | 84% | 2953 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% | 35,070 psi | 55% | 2582 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 46,934 psi | 74% | 2838 fps | 100% |
| Accurate High Country | 62.3 gr | 80% | 37,971 psi | 60% | 2746 fps | 95.1% |
| Accurate MAGPRO | 68.2 gr | 86% | 44,280 psi | 69% | 2874 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 39,102 psi | 61% | 2710 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 39,943 psi | 63% | 2762 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 38,479 psi | 60% | 2720 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 30,385 psi | 48% | 2556 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,465 psi | 62% | 2713 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,962 psi | 70% | 2848 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,851 psi | 81% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,102 psi | 61% | 2707 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,012 psi | 55% | 2648 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,649 psi | 53% | 2608 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,341 psi | 46% | 2516 fps | 96.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,970 psi | 58% | 2753 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,923 psi | 80% | 2913 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 34,751 psi | 54% | 2638 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 37,507 psi | 59% | 2740 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 35,012 psi | 55% | 2648 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 49,385 psi | 77% | 2838 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 36,767 psi | 58% | 2680 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 48,559 psi | 76% | 2890 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,053 psi | 80% | 2904 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 42,670 psi | 67% | 2766 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,887 psi | 66% | 2749 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,424 psi | 66% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,780 psi | 55% | 2723 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 48,182 psi | 76% | 2917 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 44% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,860 psi | 70% | 2772 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,749 psi | 80% | 2864 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 44,556 psi | 70% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,568 psi | 65% | 2707 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 38,479 psi | 60% | 2740 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,942 psi | 59% | 2769 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 48,312 psi | 76% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,746 psi | 73% | 2808 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,284 psi | 47% | 2457 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 45,020 psi | 71% | 2815 fps | 98% |
| Norma 217 | <<locked>> | 94% | 33,199 psi | 52% | 2671 fps | 96% |
| Norma MRP | <<locked>> | 80% | 36,550 psi | 57% | 2717 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 46,006 psi | 72% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,087 psi | 60% | 2743 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 44,846 psi | 70% | 2825 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,997 psi | 53% | 2618 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,456 psi | 45% | 1716 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,934 psi | 74% | 2861 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,005 psi | 71% | 2877 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,734 psi | 50% | 2628 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,019 psi | 69% | 2920 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 53,983 psi | 85% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,466 psi | 63% | 2690 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 38,537 psi | 60% | 2694 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 49,385 psi | 77% | 2838 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,312 psi | 76% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,746 psi | 73% | 2808 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,751 psi | 84% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,239 psi | 74% | 2759 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,203 psi | 60% | 2687 fps | 96.6% |
| Somchem S355 | <<locked>> | 80% | 53,563 psi | 84% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,133 psi | 64% | 2677 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 43,047 psi | 67% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,117 psi | 61% | 2677 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 51,387 psi | 81% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,355 psi | 74% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,794 psi | 53% | 2543 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 46,717 psi | 73% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,710 psi | 59% | 2687 fps | 99.8% |
| Vihtavuori N560 | 65.4 gr | 84% | 42,235 psi | 66% | 2831 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 39,697 psi | 62% | 2762 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 45,542 psi | 71% | 2933 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,557 psi | 73% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,559 psi | 76% | 2890 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,008 psi | 47% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,665 psi | 56% | 2595 fps | 95.5% |
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 76 powders for 7 x 66 SE v. Hofe loaded with the .284 | 155gr | Frontier PH HPFB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,179 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 155.0 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. Vihtavuori N560, Accurate MAGPRO, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 155gr | Frontier PH HPFB 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.