Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Sierra GameKing bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 and Winchester StaBALL HD.
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>> | 96% | 57,014 psi | 89% | 3127 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,781 psi | 86% | 3114 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,607 psi | 86% | 3225 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 94% | 55,564 psi | 87% | 3222 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 55,724 psi | 87% | 3071 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,535 psi | 87% | 3166 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 56,927 psi | 89% | 3228 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,790 psi | 75% | 3048 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,496 psi | 67% | 3002 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,246 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,376 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,811 psi | 89% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,129 psi | 86% | 3156 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,811 psi | 89% | 3225 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,186 psi | 85% | 3136 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 3199 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,694 psi | 86% | 3232 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,709 psi | 87% | 3205 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,588 psi | 78% | 3123 fps | 97.9% |
| Bofors RP5 | <<locked>> | 96% | 56,811 psi | 89% | 3225 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 57,145 psi | 90% | 3110 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 3143 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 86% | 56,463 psi | 88% | 3169 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 55,434 psi | 87% | 3120 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 56,855 psi | 89% | 3163 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,883 psi | 88% | 3146 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,898 psi | 88% | 3091 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3264 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 86% | 56,942 psi | 89% | 3205 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 1975 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,187 psi | 86% | 3094 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,274 psi | 87% | 3081 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 55,143 psi | 86% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,520 psi | 85% | 3087 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 54,578 psi | 86% | 3202 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 55,724 psi | 87% | 3077 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,493 psi | 90% | 3130 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,317 psi | 85% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,231 psi | 88% | 3153 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2917 fps | 96.8% |
| Norma MRP | <<locked>> | 94% | 56,695 psi | 89% | 3248 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 56,840 psi | 89% | 3150 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,477 psi | 87% | 3225 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 55,637 psi | 87% | 3156 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,664 psi | 84% | 3153 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 59% | 2021 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,260 psi | 88% | 3176 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,650 psi | 86% | 3133 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,869 psi | 89% | 3222 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,142 psi | 83% | 3261 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,109 psi | 75% | 3130 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 82% | 54,882 psi | 86% | 3061 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,855 psi | 89% | 3136 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 54,433 psi | 85% | 3140 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 57,145 psi | 90% | 3110 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,724 psi | 87% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,493 psi | 90% | 3130 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,304 psi | 88% | 3117 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,969 psi | 86% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,085 psi | 86% | 3028 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,609 psi | 90% | 3196 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 54,578 psi | 86% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,752 psi | 86% | 3064 fps | 97.6% |
| Somchem S365 | <<locked>> | 90% | 57,000 psi | 89% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,984 psi | 86% | 3114 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 55,811 psi | 87% | 3022 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,071 psi | 86% | 3087 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,476 psi | 85% | 3087 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 54,230 psi | 85% | 3091 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,594 psi | 89% | 3169 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,565 psi | 89% | 3241 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3215 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,549 psi | 85% | 3041 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,463 psi | 88% | 3169 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,463 psi | 87% | 3281 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,882 psi | 86% | 3104 fps | 99.1% |
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% | 33,156 psi | 52% | 2651 fps | 96.3% |
| Accurate 4350 | <<locked>> | 80% | 44,599 psi | 70% | 2933 fps | 99.9% |
| Accurate High Country | 67.2 gr | 84% | 41,191 psi | 65% | 2949 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 90% | 48,283 psi | 76% | 3087 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 52,591 psi | 82% | 3018 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,639 psi | 62% | 2848 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 43,366 psi | 68% | 2963 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 96% | 41,698 psi | 65% | 2913 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 94% | 34,969 psi | 55% | 2805 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,780 psi | 84% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,656 psi | 67% | 2940 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,284 psi | 77% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,740 psi | 62% | 2848 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,782 psi | 59% | 2841 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,705 psi | 50% | 2684 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,559 psi | 46% | 2635 fps | 95.3% |
| Alliant Reloder-26 | 66 gr | 80% | 34,679 psi | 54% | 2825 fps | 98.3% |
| Bofors RP15 | <<locked>> | 86% | 37,492 psi | 59% | 2831 fps | 95% |
| Bofors RP30 | <<locked>> | 94% | 40,335 psi | 63% | 2930 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 37,782 psi | 59% | 2841 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 47,297 psi | 74% | 2936 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 39,885 psi | 63% | 2874 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 46,253 psi | 72% | 2982 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 48,704 psi | 76% | 2999 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 46,514 psi | 73% | 2972 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,513 psi | 71% | 2953 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,263 psi | 63% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,565 psi | 59% | 2917 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 45,571 psi | 71% | 3002 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1768 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,801 psi | 67% | 2861 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,660 psi | 76% | 2963 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 42,453 psi | 67% | 2877 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,078 psi | 71% | 2907 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 88% | 41,684 psi | 65% | 2936 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 46,253 psi | 72% | 2910 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,643 psi | 70% | 2900 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 30,443 psi | 48% | 2579 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 42,859 psi | 67% | 2897 fps | 96.6% |
| Norma 217 | <<locked>> | 98% | 35,520 psi | 56% | 2851 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 34,447 psi | 54% | 2782 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 43,729 psi | 69% | 2917 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 41,394 psi | 65% | 2943 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 42,612 psi | 67% | 2913 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 36,941 psi | 58% | 2812 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,297 psi | 44% | 1811 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,330 psi | 82% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,425 psi | 70% | 2949 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,728 psi | 67% | 2969 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,432 psi | 54% | 2822 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 44,512 psi | 70% | 3051 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 51,474 psi | 81% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,133 psi | 64% | 2831 fps | 95% |
| Rottweil R 905 | <<locked>> | 82% | 38,943 psi | 61% | 2828 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 47,297 psi | 74% | 2936 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,253 psi | 72% | 2910 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,643 psi | 70% | 2900 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,910 psi | 83% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,576 psi | 81% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,339 psi | 71% | 2854 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,595 psi | 60% | 2822 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 51,271 psi | 80% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,817 psi | 70% | 2877 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 40,524 psi | 64% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,014 psi | 58% | 2753 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 49,124 psi | 77% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,194 psi | 71% | 2917 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 36,579 psi | 57% | 2733 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 44,556 psi | 70% | 2917 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 35,665 psi | 56% | 2769 fps | 99% |
| Vihtavuori N560 | <<locked>> | 88% | 45,876 psi | 72% | 3038 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 92% | 42,859 psi | 67% | 2956 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,150 psi | 69% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,253 psi | 72% | 2982 fps | 98.9% |
| Winchester StaBALL HD | 63.4 gr | 80% | 28,253 psi | 44% | 2687 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,812 psi | 61% | 2792 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 83 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,281 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 1:10.0 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. Accurate High Country, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 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.