Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Nosler CT FailSafe bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP and Vihtavuori N560.
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% | 55,172 psi | 86% | 3100 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,420 psi | 88% | 3140 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,463 psi | 88% | 3258 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 94% | 57,537 psi | 90% | 3261 fps | 98% |
| ADI AR 2208 | <<locked>> | 82% | 57,087 psi | 89% | 3097 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,174 psi | 90% | 3199 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 54,984 psi | 86% | 3199 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,197 psi | 77% | 3081 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,961 psi | 69% | 3038 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,377 psi | 90% | 3192 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,043 psi | 89% | 3199 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,607 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,652 psi | 89% | 3186 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,013 psi | 86% | 3196 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,130 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3232 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,695 psi | 89% | 3264 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,869 psi | 89% | 3153 fps | 96.2% |
| Bofors RP15 | <<locked>> | 98% | 57,725 psi | 90% | 3238 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 3159 fps | 98.4% |
| Bofors RP5 | <<locked>> | 94% | 55,013 psi | 86% | 3196 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 55,114 psi | 86% | 3081 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3182 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 54,259 psi | 85% | 3136 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,913 psi | 89% | 3150 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 54,969 psi | 86% | 3136 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,595 psi | 90% | 3179 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,435 psi | 90% | 3114 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,346 psi | 85% | 3301 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 54,723 psi | 86% | 3169 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1988 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,739 psi | 89% | 3123 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,463 psi | 88% | 3107 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 56,666 psi | 89% | 3130 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,883 psi | 88% | 3117 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 56,637 psi | 89% | 3241 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 57,130 psi | 90% | 3107 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,245 psi | 87% | 3097 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,159 psi | 88% | 3117 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,085 psi | 85% | 3120 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 39,566 psi | 62% | 2956 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 54,679 psi | 86% | 3215 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 54,636 psi | 86% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,493 psi | 90% | 3264 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 57,290 psi | 90% | 3182 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,825 psi | 87% | 3186 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 2034 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,391 psi | 88% | 3163 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,665 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3301 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 3169 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,347 psi | 88% | 3084 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,636 psi | 86% | 3104 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 56,043 psi | 88% | 3169 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,114 psi | 86% | 3081 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,130 psi | 90% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,245 psi | 87% | 3097 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,086 psi | 88% | 2946 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,405 psi | 88% | 3054 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,608 psi | 87% | 3166 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 55,970 psi | 88% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,231 psi | 88% | 3091 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 55,216 psi | 87% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,739 psi | 89% | 3143 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 57,305 psi | 90% | 3048 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,565 psi | 89% | 3114 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,188 psi | 88% | 3120 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,608 psi | 87% | 3117 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,795 psi | 86% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,520 psi | 85% | 3209 fps | 98% |
| Vihtavuori N565 | <<locked>> | 98% | 54,505 psi | 85% | 3186 fps | 98.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 3179 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,028 psi | 88% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,505 psi | 85% | 3140 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,867 psi | 84% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,826 psi | 89% | 3140 fps | 99.4% |
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% | 34,171 psi | 54% | 2680 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 45,774 psi | 72% | 2959 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 42,801 psi | 67% | 2989 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 88% | 46,499 psi | 73% | 3054 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 53,737 psi | 84% | 3041 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,232 psi | 60% | 2818 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 41,800 psi | 66% | 2930 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 96% | 43,062 psi | 67% | 2953 fps | 96% |
| ADI AR 2225 | <<locked>> | 92% | 33,866 psi | 53% | 2772 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,537 psi | 60% | 2818 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,859 psi | 69% | 2966 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,734 psi | 80% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,189 psi | 60% | 2812 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,102 psi | 61% | 2874 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,837 psi | 51% | 2713 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,603 psi | 48% | 2671 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,984 psi | 56% | 2858 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,374 psi | 84% | 3091 fps | 95.3% |
| Bofors RP15 | <<locked>> | 86% | 38,769 psi | 61% | 2861 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 39,117 psi | 61% | 2900 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 39,102 psi | 61% | 2874 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 48,559 psi | 76% | 2966 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 41,249 psi | 65% | 2913 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 47,529 psi | 74% | 3012 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,966 psi | 78% | 3028 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 44,614 psi | 70% | 2940 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,859 psi | 69% | 2920 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,423 psi | 65% | 2841 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,332 psi | 57% | 2884 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 47,166 psi | 74% | 3035 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1775 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,976 psi | 69% | 2887 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,893 psi | 78% | 2992 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 43,569 psi | 68% | 2900 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,352 psi | 68% | 2877 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 88% | 42,917 psi | 67% | 2969 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 47,500 psi | 74% | 2940 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,861 psi | 72% | 2927 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 31,459 psi | 49% | 2605 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 44,019 psi | 69% | 2927 fps | 97% |
| Norma 217 | <<locked>> | 96% | 34,606 psi | 54% | 2825 fps | 95.5% |
| Norma MRP | 65.8 gr | 80% | 35,694 psi | 56% | 2818 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 45,049 psi | 71% | 2946 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 39,871 psi | 62% | 2910 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 43,830 psi | 69% | 2940 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 35,607 psi | 56% | 2779 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 45% | 1824 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,919 psi | 72% | 2982 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,106 psi | 69% | 2999 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,214 psi | 52% | 2785 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,514 psi | 73% | 3097 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 52,924 psi | 83% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,250 psi | 66% | 2861 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 37,623 psi | 59% | 2799 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 48,559 psi | 76% | 2966 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,500 psi | 74% | 2940 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,861 psi | 72% | 2927 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,736 psi | 83% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,485 psi | 73% | 2881 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,304 psi | 58% | 2792 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 52,649 psi | 83% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,093 psi | 72% | 2907 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 41,945 psi | 66% | 2897 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,130 psi | 60% | 2782 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,459 psi | 79% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,296 psi | 73% | 2940 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 35,302 psi | 55% | 2703 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 45,759 psi | 72% | 2943 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,811 psi | 58% | 2795 fps | 99.3% |
| Vihtavuori N560 | 70.7 gr | 86% | 44,280 psi | 69% | 3009 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 44,483 psi | 70% | 2992 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 98% | 47,718 psi | 75% | 3107 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,469 psi | 71% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,718 psi | 75% | 3015 fps | 99.2% |
| Winchester StaBALL HD | 65.1 gr | 80% | 29,196 psi | 46% | 2723 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,376 psi | 59% | 2759 fps | 95.2% |
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 | 140gr | Nosler CT FailSafe. Hodgdon Retumbo delivers the highest muzzle velocity at 3,301 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,301 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 140.0 gr projectile in 0.284" calls for a 1:12.5 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, Norma MRP, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Nosler CT FailSafe 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.