Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .285 | 139gr | Prvi Partizan SP bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Accurate High Country and Alliant Reloder-26.
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% | 56,695 psi | 89% | 3136 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,070 psi | 85% | 3120 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,563 psi | 86% | 3235 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 92% | 55,419 psi | 87% | 3235 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 90% | 54,998 psi | 86% | 3179 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 56,623 psi | 89% | 3245 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 3127 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,571 psi | 71% | 3087 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,216 psi | 87% | 3173 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,969 psi | 86% | 3179 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,217 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,563 psi | 86% | 3163 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,739 psi | 89% | 3238 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,288 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 3271 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,636 psi | 86% | 3241 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,666 psi | 87% | 3219 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,374 psi | 84% | 3205 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 56,739 psi | 89% | 3238 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 56,362 psi | 88% | 3120 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,159 psi | 88% | 3228 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,753 psi | 87% | 3176 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 54,578 psi | 86% | 3127 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 56,347 psi | 88% | 3173 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,216 psi | 87% | 3153 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,216 psi | 87% | 3094 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3350 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,275 psi | 88% | 3212 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 58% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,563 psi | 86% | 3104 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,667 psi | 90% | 3143 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 54,549 psi | 85% | 3110 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,261 psi | 90% | 3156 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 54,505 psi | 85% | 3215 fps | 98.5% |
| Lovex S065 | <<locked>> | 84% | 54,853 psi | 86% | 3084 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,695 psi | 89% | 3136 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 54,418 psi | 85% | 3100 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,405 psi | 87% | 3159 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,162 psi | 65% | 3005 fps | 98% |
| Norma MRP | <<locked>> | 92% | 56,695 psi | 89% | 3261 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,202 psi | 88% | 3159 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,230 psi | 87% | 3238 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 55,013 psi | 86% | 3159 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,693 psi | 84% | 3166 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,215 psi | 85% | 3140 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,405 psi | 88% | 3232 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3346 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 3219 fps | 97.4% |
| Rottweil R 904 | <<locked>> | 90% | 56,173 psi | 88% | 3146 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 57,653 psi | 90% | 3212 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,362 psi | 88% | 3120 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,853 psi | 86% | 3084 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,695 psi | 89% | 3136 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,305 psi | 90% | 2979 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,186 psi | 85% | 3035 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,203 psi | 90% | 3205 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,174 psi | 90% | 3110 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,027 psi | 85% | 3071 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 56,855 psi | 89% | 3159 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,607 psi | 86% | 3123 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,013 psi | 86% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,259 psi | 85% | 3091 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,128 psi | 85% | 3100 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 57,217 psi | 90% | 3156 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,550 psi | 89% | 3182 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,434 psi | 88% | 3255 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 56,521 psi | 89% | 3232 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,272 psi | 83% | 3225 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,711 psi | 90% | 3100 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,941 psi | 88% | 3179 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,159 psi | 88% | 3294 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,433 psi | 85% | 3117 fps | 99.2% |
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% | 35,317 psi | 55% | 2720 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 47,224 psi | 74% | 2999 fps | 100% |
| Accurate High Country | 69.5 gr | 82% | 41,104 psi | 64% | 2959 fps | 95.3% |
| Accurate MAGPRO | 74.2 gr | 86% | 44,686 psi | 70% | 3028 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 39,204 psi | 61% | 2854 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 42,989 psi | 67% | 2972 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 41,481 psi | 65% | 2927 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 32,750 psi | 51% | 2749 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,697 psi | 62% | 2858 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,121 psi | 71% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,141 psi | 82% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,363 psi | 62% | 2854 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,652 psi | 59% | 2848 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,895 psi | 53% | 2749 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,428 psi | 46% | 2641 fps | 95.4% |
| Alliant Reloder-26 | 69.8 gr | 80% | 37,159 psi | 58% | 2894 fps | 99% |
| Bofors RP15 | <<locked>> | 84% | 37,463 psi | 59% | 2841 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 40,480 psi | 63% | 2943 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 37,652 psi | 59% | 2848 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 49,647 psi | 78% | 3002 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 39,697 psi | 62% | 2890 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,820 psi | 77% | 3048 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 51,256 psi | 80% | 3068 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 42,888 psi | 67% | 2913 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,092 psi | 71% | 2963 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,627 psi | 67% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,565 psi | 59% | 2933 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 48,501 psi | 76% | 3074 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,991 psi | 71% | 2923 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,952 psi | 80% | 3028 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 44,715 psi | 70% | 2936 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,382 psi | 70% | 2913 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 41,278 psi | 65% | 2943 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 48,602 psi | 76% | 2976 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 46,920 psi | 74% | 2963 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 30,313 psi | 48% | 2582 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 45,194 psi | 71% | 2966 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 33,591 psi | 53% | 2805 fps | 95% |
| Norma MRP | <<locked>> | 80% | 36,840 psi | 58% | 2858 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 46,209 psi | 72% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 41,220 psi | 65% | 2956 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,049 psi | 71% | 2976 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 34,229 psi | 54% | 2753 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 45% | 1841 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,195 psi | 74% | 3018 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,324 psi | 71% | 3035 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,418 psi | 54% | 2835 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,860 psi | 70% | 3071 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 40,654 psi | 64% | 2838 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,667 psi | 61% | 2835 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,647 psi | 78% | 3002 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,602 psi | 76% | 2976 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 46,920 psi | 74% | 2963 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,722 psi | 84% | 2930 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,485 psi | 74% | 2917 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,348 psi | 60% | 2831 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 53,882 psi | 84% | 3058 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,193 psi | 69% | 2884 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 43,207 psi | 68% | 2933 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,262 psi | 62% | 2818 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 51,590 psi | 81% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,630 psi | 75% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,347 psi | 57% | 2740 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 47,021 psi | 74% | 2979 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,985 psi | 60% | 2831 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 42,627 psi | 67% | 2982 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 42,931 psi | 67% | 2969 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 46,093 psi | 72% | 3084 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,731 psi | 73% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,820 psi | 77% | 3048 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,168 psi | 47% | 2762 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,421 psi | 60% | 2795 fps | 95.7% |
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 73 powders for 7 x 66 SE v. Hofe loaded with the .285 | 139gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,350 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 139.0 gr projectile in 0.285" calls for a 1:16.0 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 MAGPRO, Accurate High Country, Alliant Reloder-26 rank at the top here: for 7 x 66 SE v. Hofe with the .285 | 139gr | Prvi Partizan SP 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.