Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Swift A-Frame bullet and 75 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% | 55,317 psi | 87% | 3104 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,637 psi | 89% | 3143 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 53,896 psi | 84% | 3199 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,261 psi | 90% | 3100 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,348 psi | 90% | 3202 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 55,158 psi | 86% | 3205 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,545 psi | 78% | 3091 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,266 psi | 69% | 3048 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,537 psi | 90% | 3199 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,261 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,752 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,811 psi | 89% | 3186 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,158 psi | 86% | 3199 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,318 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3232 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,145 psi | 90% | 3268 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,000 psi | 89% | 3156 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 54,114 psi | 85% | 3179 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 3166 fps | 98.5% |
| Bofors RP5 | <<locked>> | 94% | 55,158 psi | 86% | 3199 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 55,274 psi | 87% | 3084 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,621 psi | 86% | 3186 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 54,447 psi | 85% | 3140 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 57,043 psi | 89% | 3153 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 55,114 psi | 86% | 3136 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,740 psi | 90% | 3179 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,624 psi | 90% | 3117 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3310 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 54,882 psi | 86% | 3176 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1988 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,913 psi | 89% | 3127 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,652 psi | 89% | 3110 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 56,855 psi | 89% | 3133 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,057 psi | 88% | 3120 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 56,782 psi | 89% | 3241 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 57,319 psi | 90% | 3110 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,434 psi | 87% | 3100 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3120 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,244 psi | 85% | 3127 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 39,682 psi | 62% | 2959 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 55,085 psi | 86% | 3225 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 54,839 psi | 86% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,711 psi | 90% | 3264 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 57,464 psi | 90% | 3186 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,014 psi | 88% | 3189 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 59% | 2034 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,565 psi | 89% | 3166 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,897 psi | 86% | 3196 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3304 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,343 psi | 79% | 3173 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 56,550 psi | 89% | 3087 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,810 psi | 86% | 3107 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 56,217 psi | 88% | 3176 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,274 psi | 87% | 3084 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,319 psi | 90% | 3110 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,434 psi | 87% | 3100 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,304 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,579 psi | 89% | 3058 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,782 psi | 87% | 3169 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 56,159 psi | 88% | 3081 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,579 psi | 89% | 3100 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 55,419 psi | 87% | 3127 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,884 psi | 89% | 3146 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 57,508 psi | 90% | 3051 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,753 psi | 89% | 3117 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,565 psi | 89% | 3123 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,796 psi | 87% | 3120 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,984 psi | 86% | 3146 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,911 psi | 86% | 3215 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 54,636 psi | 86% | 3189 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,503 psi | 81% | 3182 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,173 psi | 88% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,679 psi | 86% | 3143 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,056 psi | 85% | 3255 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,956 psi | 89% | 3143 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% | 34,316 psi | 54% | 2684 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 45,992 psi | 72% | 2963 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 46,644 psi | 73% | 3058 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,896 psi | 84% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,363 psi | 60% | 2822 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 41,945 psi | 66% | 2933 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 94% | 40,451 psi | 63% | 2890 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 33,982 psi | 53% | 2779 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,711 psi | 61% | 2825 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,063 psi | 69% | 2972 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,923 psi | 80% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,363 psi | 60% | 2818 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,651 psi | 57% | 2815 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,880 psi | 52% | 2713 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,618 psi | 48% | 2671 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,158 psi | 57% | 2861 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,490 psi | 84% | 3094 fps | 95.4% |
| Bofors RP15 | <<locked>> | 86% | 38,928 psi | 61% | 2867 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 39,262 psi | 62% | 2907 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 36,651 psi | 57% | 2815 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 48,530 psi | 76% | 2966 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 90% | 38,653 psi | 61% | 2851 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 47,703 psi | 75% | 3015 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 50,125 psi | 79% | 3031 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 44,773 psi | 70% | 2943 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,019 psi | 69% | 2927 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,611 psi | 65% | 2848 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,463 psi | 57% | 2890 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 47,326 psi | 74% | 3038 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,150 psi | 69% | 2894 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,038 psi | 78% | 2995 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 43,729 psi | 69% | 2904 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,497 psi | 68% | 2881 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 43,076 psi | 68% | 2972 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 47,485 psi | 74% | 2940 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,832 psi | 72% | 2927 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 31,589 psi | 50% | 2612 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 44,164 psi | 69% | 2930 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 34,722 psi | 54% | 2828 fps | 95.6% |
| Norma MRP | 66 gr | 80% | 35,853 psi | 56% | 2822 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 45,034 psi | 71% | 2946 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 39,987 psi | 63% | 2913 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 44,005 psi | 69% | 2943 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 35,737 psi | 56% | 2782 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 44% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,890 psi | 72% | 2982 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,077 psi | 69% | 2999 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,330 psi | 52% | 2789 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,659 psi | 73% | 3100 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 52,924 psi | 83% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,424 psi | 66% | 2864 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 37,608 psi | 59% | 2799 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 48,530 psi | 76% | 2966 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,485 psi | 74% | 2940 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,832 psi | 72% | 2927 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,924 psi | 83% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,644 psi | 73% | 2884 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,289 psi | 58% | 2792 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 52,620 psi | 82% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,192 psi | 68% | 2848 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,134 psi | 66% | 2904 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,261 psi | 60% | 2782 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,430 psi | 79% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,485 psi | 73% | 2943 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,433 psi | 56% | 2707 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 45,948 psi | 72% | 2946 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,999 psi | 58% | 2802 fps | 99.3% |
| Vihtavuori N560 | 70.9 gr | 86% | 44,440 psi | 70% | 3012 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 41,698 psi | 65% | 2930 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 47,848 psi | 75% | 3110 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,585 psi | 71% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,703 psi | 75% | 3015 fps | 99.2% |
| Winchester StaBALL HD | 65.3 gr | 80% | 29,298 psi | 46% | 2726 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,492 psi | 59% | 2762 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 75 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,310 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 1:13.0 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Swift A-Frame 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.