Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 130gr | Sierra SP SSPistol 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 MAGPRO, Alliant Reloder-26 and Accurate High Country.
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% | 56,608 psi | 89% | 3222 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,114 psi | 85% | 3209 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,186 psi | 85% | 3317 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 94% | 55,288 psi | 87% | 3317 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,477 psi | 87% | 3176 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,013 psi | 86% | 3261 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 56,695 psi | 89% | 3327 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,456 psi | 74% | 3133 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,235 psi | 66% | 3084 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,230 psi | 87% | 3258 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,637 psi | 89% | 3199 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,027 psi | 86% | 3274 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,217 psi | 88% | 3287 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,549 psi | 85% | 3248 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,536 psi | 89% | 3323 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,421 psi | 90% | 3294 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,156 psi | 83% | 3294 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 53,969 psi | 85% | 3323 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,448 psi | 87% | 3301 fps | 98.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 3212 fps | 97.3% |
| Bofors RP5 | <<locked>> | 96% | 56,536 psi | 89% | 3323 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 56,739 psi | 89% | 3209 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3235 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 86% | 55,927 psi | 88% | 3264 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,955 psi | 86% | 3219 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 94% | 56,507 psi | 89% | 3258 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,303 psi | 87% | 3235 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,390 psi | 87% | 3189 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3356 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 56,594 psi | 89% | 3304 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 2060 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,752 psi | 86% | 3189 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,766 psi | 86% | 3179 fps | 99.5% |
| IMR 4831 | <<locked>> | 88% | 54,679 psi | 86% | 3202 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,580 psi | 90% | 3241 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 54,360 psi | 85% | 3297 fps | 97.9% |
| Lovex S065 | <<locked>> | 86% | 55,288 psi | 87% | 3179 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,855 psi | 89% | 3225 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3182 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,753 psi | 87% | 3248 fps | 98.7% |
| Norma MRP | <<locked>> | 94% | 56,304 psi | 88% | 3346 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 56,173 psi | 88% | 3248 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,984 psi | 86% | 3317 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 88% | 55,201 psi | 87% | 3251 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,682 psi | 90% | 3317 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2110 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,479 psi | 90% | 3222 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,550 psi | 87% | 3274 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,201 psi | 85% | 3232 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,333 psi | 88% | 3323 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3353 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,462 psi | 85% | 3159 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,391 psi | 88% | 3232 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 94% | 57,609 psi | 90% | 3297 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 56,739 psi | 89% | 3209 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,288 psi | 87% | 3179 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,855 psi | 89% | 3225 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,840 psi | 88% | 3219 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,389 psi | 85% | 3028 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,766 psi | 86% | 3127 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,159 psi | 90% | 3291 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 57,595 psi | 90% | 3209 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,404 psi | 85% | 3153 fps | 97.1% |
| Somchem S365 | <<locked>> | 90% | 56,521 psi | 89% | 3251 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,592 psi | 86% | 3205 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 55,448 psi | 87% | 3127 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,491 psi | 85% | 3186 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,099 psi | 85% | 3179 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 57,290 psi | 90% | 3245 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,956 psi | 88% | 3264 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,188 psi | 88% | 3337 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3307 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,230 psi | 85% | 3140 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,173 psi | 88% | 3268 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,027 psi | 86% | 3379 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,491 psi | 85% | 3196 fps | 98.7% |
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% | 32,721 psi | 51% | 2726 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 43,990 psi | 69% | 3022 fps | 99.6% |
| Accurate High Country | 71.9 gr | 86% | 43,816 psi | 69% | 3104 fps | 95.3% |
| Accurate MAGPRO | 76.7 gr | 90% | 47,906 psi | 75% | 3176 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 52,025 psi | 82% | 3117 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 42,003 psi | 66% | 2999 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 90% | 46,064 psi | 72% | 3117 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 98% | 44,338 psi | 69% | 3064 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 34,606 psi | 54% | 2871 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,697 psi | 62% | 2936 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,316 psi | 84% | 3146 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,061 psi | 66% | 3025 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,631 psi | 76% | 3163 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,320 psi | 62% | 2930 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,190 psi | 63% | 2989 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,357 psi | 49% | 2759 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,241 psi | 49% | 2769 fps | 95.4% |
| Alliant Reloder-26 | 68.9 gr | 80% | 34,185 psi | 54% | 2897 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 39,653 psi | 62% | 2976 fps | 95.1% |
| Bofors RP30 | <<locked>> | 96% | 42,757 psi | 67% | 3077 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 40,190 psi | 63% | 2989 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 46,905 psi | 74% | 3028 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 94% | 42,540 psi | 67% | 3028 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 45,759 psi | 72% | 3071 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 48,327 psi | 76% | 3091 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 88% | 45,977 psi | 72% | 3054 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 90% | 48,370 psi | 76% | 3104 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,726 psi | 62% | 2904 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,769 psi | 62% | 3064 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 45,237 psi | 71% | 3091 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,525 psi | 67% | 2949 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,254 psi | 76% | 3058 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 41,974 psi | 66% | 2963 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 47,601 psi | 75% | 3058 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 44,150 psi | 69% | 3087 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 45,890 psi | 72% | 3002 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 44,193 psi | 69% | 2986 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 32,024 psi | 50% | 2707 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 42,395 psi | 66% | 2982 fps | 95.8% |
| Norma MRP | <<locked>> | 82% | 36,666 psi | 57% | 2930 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 43,236 psi | 68% | 3009 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 44,092 psi | 69% | 3097 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 42,148 psi | 66% | 2995 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 88% | 36,622 psi | 57% | 2887 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1890 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,998 psi | 85% | 3163 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,619 psi | 81% | 3212 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,005 psi | 69% | 3041 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,235 psi | 66% | 3051 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,680 psi | 57% | 2969 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 50,966 psi | 80% | 3104 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,584 psi | 68% | 2979 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 41,278 psi | 65% | 2976 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 46,905 psi | 74% | 3028 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,890 psi | 72% | 3002 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 44,193 psi | 69% | 2986 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,359 psi | 82% | 3163 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,169 psi | 80% | 2979 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,904 psi | 70% | 2943 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,915 psi | 64% | 2969 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 50,821 psi | 80% | 3097 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,630 psi | 75% | 3028 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 40,176 psi | 63% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,651 psi | 57% | 2831 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 48,675 psi | 76% | 3015 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,657 psi | 70% | 3002 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 38,754 psi | 61% | 2874 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 44,135 psi | 69% | 3005 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 35,099 psi | 55% | 2844 fps | 98.5% |
| Vihtavuori N560 | <<locked>> | 88% | 45,542 psi | 71% | 3127 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 94% | 45,527 psi | 71% | 3104 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,859 psi | 69% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,759 psi | 72% | 3071 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,891 psi | 44% | 2753 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,278 psi | 65% | 2936 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 76 powders for 7 x 66 SE v. Hofe loaded with the .284 | 130gr | Sierra SP SSPistol. Winchester StaBALL HD delivers the highest muzzle velocity at 3,379 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,379 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 130.0 gr projectile in 0.284" calls for a 1:13.5 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. Accurate MAGPRO, Alliant Reloder-26, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 130gr | Sierra SP SSPistol 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.