Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 155gr | CutEdge MTH bullet and 77 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,390 psi | 87% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,521 psi | 89% | 3002 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,217 psi | 90% | 3133 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 92% | 54,085 psi | 85% | 3068 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 57,580 psi | 90% | 2956 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 54,099 psi | 85% | 3012 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 55,434 psi | 87% | 3074 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,777 psi | 78% | 2969 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,251 psi | 69% | 2927 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,331 psi | 85% | 3009 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,070 psi | 85% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,027 psi | 86% | 3015 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,290 psi | 90% | 3054 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,376 psi | 87% | 3064 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,724 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3100 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,508 psi | 90% | 3130 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,203 psi | 90% | 3031 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 54,563 psi | 86% | 3051 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 3041 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 55,376 psi | 87% | 3064 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,477 psi | 87% | 2949 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3061 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 54,824 psi | 86% | 3005 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,406 psi | 90% | 3018 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 55,463 psi | 87% | 3009 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,244 psi | 85% | 2992 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,389 psi | 85% | 2927 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,013 psi | 86% | 3179 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,245 psi | 87% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1877 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,217 psi | 90% | 2992 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,000 psi | 89% | 2976 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,014 psi | 89% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,434 psi | 88% | 2992 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 96% | 57,261 psi | 90% | 3114 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,740 psi | 62% | 2818 fps | 96.2% |
| Lovex S065 | <<locked>> | 86% | 57,392 psi | 90% | 2969 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,550 psi | 87% | 2966 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,636 psi | 86% | 2995 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,668 psi | 62% | 2841 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 55,419 psi | 87% | 3091 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,100 psi | 86% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,925 psi | 85% | 3068 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 54,172 psi | 85% | 2995 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,536 psi | 89% | 3064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,840 psi | 59% | 1923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,739 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,419 psi | 87% | 3061 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3173 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 3054 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,753 psi | 89% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,187 psi | 86% | 2979 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 56,608 psi | 89% | 3041 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,477 psi | 87% | 2949 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,392 psi | 90% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,550 psi | 87% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,623 psi | 89% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,811 psi | 89% | 2923 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,159 psi | 88% | 3038 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 56,347 psi | 88% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,797 psi | 89% | 2972 fps | 98.7% |
| Somchem S365 | <<locked>> | 88% | 55,695 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,043 psi | 89% | 3012 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 57,537 psi | 90% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,884 psi | 89% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,840 psi | 89% | 2992 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 55,985 psi | 88% | 2982 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,100 psi | 86% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,274 psi | 87% | 3087 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 54,969 psi | 86% | 3061 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,793 psi | 81% | 3061 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,695 psi | 89% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,042 psi | 86% | 3009 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,592 psi | 86% | 3117 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,276 psi | 90% | 3012 fps | 99.8% |
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% | 34,026 psi | 53% | 2562 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 45,934 psi | 72% | 2828 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 39,958 psi | 63% | 2802 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 86% | 43,555 psi | 68% | 2867 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 54,027 psi | 85% | 2907 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,464 psi | 60% | 2707 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 39,262 psi | 62% | 2753 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 37,826 psi | 59% | 2713 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 90% | 31,647 psi | 50% | 2605 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,783 psi | 61% | 2707 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,208 psi | 69% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,387 psi | 81% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,435 psi | 60% | 2700 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,229 psi | 54% | 2635 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,880 psi | 52% | 2598 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,529 psi | 45% | 2500 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,998 psi | 56% | 2740 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,415 psi | 79% | 2913 fps | 95.5% |
| Bofors RP15 | <<locked>> | 84% | 36,390 psi | 57% | 2687 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 36,724 psi | 58% | 2726 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 34,229 psi | 54% | 2635 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 48,718 psi | 76% | 2838 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 36,100 psi | 57% | 2674 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 47,863 psi | 75% | 2884 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 50,488 psi | 79% | 2904 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 41,959 psi | 66% | 2759 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,191 psi | 65% | 2743 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,582 psi | 65% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,113 psi | 53% | 2710 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 47,630 psi | 75% | 2913 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1680 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,266 psi | 69% | 2769 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,227 psi | 79% | 2864 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 43,729 psi | 69% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,973 psi | 64% | 2703 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 40,408 psi | 63% | 2792 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,101 psi | 58% | 2756 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 47,601 psi | 75% | 2808 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,006 psi | 72% | 2802 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 29,109 psi | 46% | 2434 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 44,338 psi | 69% | 2808 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 32,329 psi | 51% | 2654 fps | 95.6% |
| Norma MRP | 62.9 gr | 80% | 35,737 psi | 56% | 2703 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 45,310 psi | 71% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,246 psi | 58% | 2730 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 44,150 psi | 69% | 2818 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,069 psi | 52% | 2602 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,093 psi | 72% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,280 psi | 69% | 2871 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 30,951 psi | 49% | 2612 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,294 psi | 68% | 2910 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 53,113 psi | 83% | 2894 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,871 psi | 62% | 2687 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 37,782 psi | 59% | 2684 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 48,718 psi | 76% | 2838 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,601 psi | 75% | 2808 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,006 psi | 72% | 2802 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,011 psi | 83% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,485 psi | 73% | 2753 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,449 psi | 59% | 2680 fps | 96.4% |
| Somchem S355 | <<locked>> | 80% | 52,837 psi | 83% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,364 psi | 63% | 2667 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 42,250 psi | 66% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,261 psi | 60% | 2664 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,705 psi | 79% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,659 psi | 73% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,025 psi | 52% | 2533 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,948 psi | 72% | 2815 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,796 psi | 58% | 2674 fps | 99.7% |
| Vihtavuori N560 | 66.1 gr | 84% | 41,626 psi | 65% | 2825 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 38,856 psi | 61% | 2749 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 44,672 psi | 70% | 2923 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,861 psi | 72% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,066 psi | 75% | 2890 fps | 99.6% |
| Winchester StaBALL HD | 62.3 gr | 80% | 29,124 psi | 46% | 2615 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,911 psi | 55% | 2585 fps | 95.3% |
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 77 powders for 7 x 66 SE v. Hofe loaded with the .284 | 155gr | CutEdge MTH. 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 77 of the 77 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 155gr | CutEdge MTH 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.