Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 130gr | Speer Boat-Tail bullet and 74 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% | 56,898 psi | 89% | 3228 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,491 psi | 85% | 3215 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,476 psi | 85% | 3323 fps | 98% |
| Accurate MAGPRO | <<locked>> | 94% | 55,579 psi | 87% | 3327 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 55,579 psi | 87% | 3179 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,274 psi | 87% | 3268 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 56,739 psi | 89% | 3330 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,485 psi | 74% | 3136 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,453 psi | 67% | 3091 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,956 psi | 89% | 3205 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,114 psi | 86% | 3278 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,536 psi | 89% | 3297 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,853 psi | 86% | 3255 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,594 psi | 89% | 3323 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 53,983 psi | 85% | 3241 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 3297 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,302 psi | 85% | 3330 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,753 psi | 87% | 3310 fps | 99% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3215 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 56,594 psi | 89% | 3323 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 57,000 psi | 89% | 3215 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3241 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 86% | 56,246 psi | 88% | 3271 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 55,245 psi | 87% | 3222 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 56,768 psi | 89% | 3264 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,608 psi | 87% | 3245 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,521 psi | 87% | 3192 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,402 psi | 82% | 3363 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 56,884 psi | 89% | 3310 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,883 psi | 58% | 2064 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,027 psi | 86% | 3196 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,839 psi | 86% | 3182 fps | 99.5% |
| IMR 4831 | <<locked>> | 88% | 54,795 psi | 86% | 3205 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,317 psi | 85% | 3186 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 96% | 54,418 psi | 85% | 3301 fps | 97.9% |
| Lovex S065 | <<locked>> | 86% | 55,608 psi | 87% | 3186 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,174 psi | 90% | 3235 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,085 psi | 85% | 3182 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 56,043 psi | 88% | 3255 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 56,623 psi | 89% | 3353 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 56,478 psi | 89% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,274 psi | 87% | 3323 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 55,463 psi | 87% | 3258 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 53,621 psi | 84% | 3251 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2110 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,941 psi | 88% | 3281 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,505 psi | 85% | 3238 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,652 psi | 89% | 3327 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 3356 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,563 psi | 86% | 3166 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,478 psi | 89% | 3235 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 92% | 54,201 psi | 85% | 3241 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 57,000 psi | 89% | 3215 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,608 psi | 87% | 3186 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,174 psi | 90% | 3235 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,173 psi | 88% | 3225 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,752 psi | 86% | 3035 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,868 psi | 86% | 3130 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,493 psi | 90% | 3301 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 54,346 psi | 85% | 3159 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,665 psi | 86% | 3163 fps | 97.2% |
| Somchem S365 | <<locked>> | 90% | 56,869 psi | 89% | 3258 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,853 psi | 86% | 3212 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 55,550 psi | 87% | 3127 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,795 psi | 86% | 3189 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,389 psi | 85% | 3189 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 57,595 psi | 90% | 3251 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,304 psi | 88% | 3271 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,492 psi | 89% | 3343 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 3314 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,244 psi | 85% | 3140 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,246 psi | 88% | 3271 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,376 psi | 87% | 3386 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,781 psi | 86% | 3205 fps | 98.8% |
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% | 32,837 psi | 51% | 2730 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 44,121 psi | 69% | 3025 fps | 99.7% |
| Accurate High Country | 72.2 gr | 86% | 44,106 psi | 69% | 3110 fps | 95.5% |
| Accurate MAGPRO | 76.9 gr | 90% | 47,979 psi | 75% | 3179 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 52,127 psi | 82% | 3120 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,523 psi | 62% | 2940 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 46,325 psi | 73% | 3127 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 44,556 psi | 70% | 3071 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 34,809 psi | 55% | 2881 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,432 psi | 84% | 3150 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,351 psi | 66% | 3035 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,979 psi | 77% | 3169 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,392 psi | 62% | 2930 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,292 psi | 63% | 2992 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,444 psi | 49% | 2762 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,459 psi | 49% | 2779 fps | 95.5% |
| Alliant Reloder-26 | 69.2 gr | 80% | 34,432 psi | 54% | 2907 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 39,914 psi | 63% | 2982 fps | 95.2% |
| Bofors RP30 | <<locked>> | 96% | 42,989 psi | 67% | 3084 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 40,292 psi | 63% | 2992 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 47,021 psi | 74% | 3031 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 42,583 psi | 67% | 3031 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 45,847 psi | 72% | 3077 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 48,414 psi | 76% | 3097 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 88% | 46,224 psi | 72% | 3064 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 48,617 psi | 76% | 3114 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,842 psi | 62% | 2907 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,987 psi | 63% | 3074 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 45,339 psi | 71% | 3097 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,641 psi | 67% | 2953 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,530 psi | 76% | 3064 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 42,090 psi | 66% | 2969 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 47,863 psi | 75% | 3061 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 90% | 44,396 psi | 70% | 3094 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 45,992 psi | 72% | 3009 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 44,280 psi | 69% | 2989 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 32,242 psi | 51% | 2713 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 42,496 psi | 67% | 2989 fps | 95.9% |
| Norma MRP | <<locked>> | 82% | 36,767 psi | 58% | 2936 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 43,352 psi | 68% | 3012 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 44,324 psi | 69% | 3104 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 42,235 psi | 66% | 2999 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 36,869 psi | 58% | 2894 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 44% | 1893 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,967 psi | 81% | 3222 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,092 psi | 69% | 3045 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,351 psi | 66% | 3058 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,869 psi | 58% | 2976 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 51,111 psi | 80% | 3107 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,671 psi | 68% | 2986 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 38,638 psi | 61% | 2913 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 47,021 psi | 74% | 3031 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,992 psi | 72% | 3009 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 44,280 psi | 69% | 2989 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,475 psi | 82% | 3166 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,271 psi | 80% | 2982 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,150 psi | 71% | 2949 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,017 psi | 64% | 2976 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 50,952 psi | 80% | 3100 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,848 psi | 75% | 3035 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 40,321 psi | 63% | 2966 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,753 psi | 58% | 2835 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 48,776 psi | 76% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,773 psi | 70% | 3009 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 39,001 psi | 61% | 2881 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 44,222 psi | 69% | 3012 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 35,375 psi | 55% | 2854 fps | 98.6% |
| Vihtavuori N560 | <<locked>> | 88% | 45,629 psi | 72% | 3130 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 45,600 psi | 71% | 3110 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,961 psi | 69% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,050 psi | 72% | 3081 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,949 psi | 44% | 2756 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,336 psi | 65% | 2940 fps | 95.8% |
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 81 powders for 7 x 66 SE v. Hofe loaded with the .284 | 130gr | Speer Boat-Tail. Winchester StaBALL HD delivers the highest muzzle velocity at 3,386 fps; across all powders the maximum-charge window runs from 2,064 fps to 3,386 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 | Speer Boat-Tail they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Vihtavuori N170, Vihtavuori N570 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.