Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 135gr | Atomic 29 HP bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 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>> | 96% | 56,130 psi | 88% | 3163 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,566 psi | 90% | 3205 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 57,566 psi | 90% | 3320 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 94% | 54,563 psi | 86% | 3251 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,187 psi | 86% | 3114 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,549 psi | 85% | 3199 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 56,057 psi | 88% | 3261 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,818 psi | 73% | 3068 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,698 psi | 65% | 3025 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,376 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,520 psi | 85% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,782 psi | 87% | 3225 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,667 psi | 90% | 3245 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,883 psi | 88% | 3255 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,927 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,620 psi | 82% | 3228 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,624 psi | 90% | 3327 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,810 psi | 86% | 3238 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 57,435 psi | 90% | 3153 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 3153 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 55,883 psi | 88% | 3255 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 56,434 psi | 88% | 3150 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 3169 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 57,522 psi | 90% | 3173 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,593 psi | 87% | 3202 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,679 psi | 86% | 3156 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 56,072 psi | 88% | 3196 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,853 psi | 86% | 3176 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,969 psi | 86% | 3127 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,488 psi | 81% | 3291 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 56,101 psi | 88% | 3241 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 2011 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,418 psi | 85% | 3130 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,433 psi | 85% | 3117 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 54,041 psi | 85% | 3136 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,058 psi | 89% | 3176 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 98% | 57,653 psi | 90% | 3301 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 55,013 psi | 86% | 3117 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,478 psi | 89% | 3163 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,476 psi | 84% | 3120 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,317 psi | 87% | 3186 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 55,680 psi | 87% | 3281 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,753 psi | 87% | 3182 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,418 psi | 85% | 3255 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 54,694 psi | 86% | 3186 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,927 psi | 89% | 3251 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2057 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,246 psi | 90% | 3159 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,042 psi | 86% | 3212 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,450 psi | 90% | 3225 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,724 psi | 87% | 3258 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 3287 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 57,740 psi | 90% | 3153 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,970 psi | 88% | 3169 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 57,276 psi | 90% | 3235 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 56,434 psi | 88% | 3150 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,013 psi | 86% | 3117 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,478 psi | 89% | 3163 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,550 psi | 87% | 3156 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,508 psi | 90% | 3015 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,360 psi | 85% | 3064 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,826 psi | 89% | 3232 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 57,406 psi | 90% | 3146 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,638 psi | 90% | 3153 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 55,956 psi | 88% | 3186 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,244 psi | 85% | 3146 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 55,085 psi | 86% | 3061 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,012 psi | 85% | 3120 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,246 psi | 90% | 3179 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 57,043 psi | 89% | 3182 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,492 psi | 87% | 3202 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,593 psi | 87% | 3271 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,303 psi | 87% | 3241 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,566 psi | 90% | 3133 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,593 psi | 87% | 3202 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,114 psi | 85% | 3314 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,056 psi | 85% | 3136 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% | 32,460 psi | 51% | 2674 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 43,700 psi | 68% | 2963 fps | 99.7% |
| Accurate High Country | <<locked>> | 86% | 43,366 psi | 68% | 3045 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 90% | 47,253 psi | 74% | 3110 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 51,851 psi | 81% | 3058 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,073 psi | 61% | 2877 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 90% | 45,701 psi | 72% | 3058 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 43,816 psi | 69% | 3005 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 34,272 psi | 54% | 2822 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,968 psi | 83% | 3081 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,887 psi | 66% | 2972 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,254 psi | 76% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,972 psi | 61% | 2871 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,827 psi | 62% | 2933 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,067 psi | 49% | 2707 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,009 psi | 49% | 2720 fps | 95.6% |
| Alliant Reloder-26 | 66.6 gr | 80% | 33,808 psi | 53% | 2841 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 39,305 psi | 62% | 2917 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 53,911 psi | 84% | 3097 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 42,322 psi | 66% | 3018 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 39,827 psi | 62% | 2933 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 46,615 psi | 73% | 2969 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 41,974 psi | 66% | 2966 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 53,780 psi | 84% | 3114 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,382 psi | 71% | 3012 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 48,095 psi | 75% | 3035 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 45,716 psi | 72% | 2999 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,979 psi | 75% | 3048 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,523 psi | 62% | 2848 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,450 psi | 62% | 3009 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,759 psi | 70% | 3028 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 43% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,105 psi | 66% | 2887 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,964 psi | 75% | 2995 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 41,655 psi | 65% | 2904 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,425 psi | 70% | 2940 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 43,743 psi | 69% | 3028 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 45,556 psi | 71% | 2943 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 43,903 psi | 69% | 2930 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 31,763 psi | 50% | 2654 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 42,047 psi | 66% | 2923 fps | 95.9% |
| Norma MRP | 66.3 gr | 82% | 36,289 psi | 57% | 2874 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 42,931 psi | 67% | 2949 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 43,772 psi | 69% | 3041 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,800 psi | 66% | 2940 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 36,361 psi | 57% | 2835 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 44% | 1844 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,621 psi | 84% | 3100 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,184 psi | 80% | 3150 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,482 psi | 68% | 2979 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,814 psi | 66% | 2992 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,245 psi | 57% | 2913 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 50,618 psi | 79% | 3041 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,265 psi | 68% | 2920 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 38,159 psi | 60% | 2851 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 46,615 psi | 73% | 2969 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,556 psi | 71% | 2943 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 43,903 psi | 69% | 2930 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,967 psi | 81% | 3100 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,923 psi | 80% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,643 psi | 70% | 2884 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,611 psi | 64% | 2913 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 50,473 psi | 79% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,268 psi | 74% | 2969 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,697 psi | 62% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,419 psi | 57% | 2779 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 48,385 psi | 76% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,396 psi | 70% | 2946 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,392 psi | 60% | 2818 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 43,743 psi | 69% | 2946 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,911 psi | 55% | 2792 fps | 98.6% |
| Vihtavuori N560 | 71.1 gr | 88% | 44,991 psi | 71% | 3064 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 44,918 psi | 70% | 3045 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,482 psi | 68% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,571 psi | 71% | 3015 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,630 psi | 43% | 2700 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,785 psi | 64% | 2877 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 83 powders for 7 x 66 SE v. Hofe loaded with the .284 | 135gr | Atomic 29 HP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,327 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,327 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 135.0 gr projectile in 0.284" calls for a 1:11.0 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 135gr | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Vihtavuori N170 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.