Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Barnes TTSX BT bullet and 82 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 Accurate MAGPRO.
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% | 54,534 psi | 85% | 3091 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,927 psi | 88% | 3133 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,275 psi | 88% | 3251 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 57,348 psi | 90% | 3255 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 54,244 psi | 85% | 3048 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,305 psi | 90% | 3196 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 96% | 54,998 psi | 86% | 3196 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,774 psi | 72% | 3005 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,451 psi | 63% | 2953 fps | 98.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,450 psi | 90% | 3192 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,288 psi | 87% | 3068 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,203 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,534 psi | 85% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,695 psi | 89% | 3182 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,650 psi | 86% | 3186 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,564 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3159 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,101 psi | 88% | 3258 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,159 psi | 90% | 3146 fps | 95.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 3232 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 56,202 psi | 88% | 3084 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,137 psi | 74% | 3077 fps | 97.3% |
| Bofors RP5 | <<locked>> | 96% | 54,650 psi | 86% | 3186 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 55,288 psi | 87% | 3081 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 3107 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 56,507 psi | 89% | 3110 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,331 psi | 85% | 3133 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 57,232 psi | 90% | 3150 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 94% | 54,926 psi | 86% | 3130 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,725 psi | 90% | 3176 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,421 psi | 90% | 3110 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,183 psi | 79% | 3222 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 54,839 psi | 86% | 3173 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,753 psi | 58% | 1969 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,116 psi | 90% | 3081 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,985 psi | 89% | 3123 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,130 psi | 90% | 3114 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 56,478 psi | 89% | 3127 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,188 psi | 88% | 3117 fps | 98% |
| IMR 7828 SSC | <<locked>> | 98% | 56,318 psi | 88% | 3232 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 57,276 psi | 90% | 3071 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,334 psi | 90% | 3104 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,361 psi | 87% | 3097 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 3045 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,230 psi | 85% | 3120 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 54,462 psi | 85% | 3215 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 54,650 psi | 86% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,261 psi | 90% | 3255 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 57,406 psi | 90% | 3182 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3179 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 59% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,188 psi | 88% | 3094 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 53,911 psi | 84% | 3143 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,188 psi | 88% | 3159 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,708 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 3219 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 56,304 psi | 88% | 3081 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,926 psi | 86% | 3104 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 55,912 psi | 88% | 3163 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 55,288 psi | 87% | 3081 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,334 psi | 90% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,276 psi | 90% | 3071 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,361 psi | 87% | 3097 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,418 psi | 85% | 3091 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,811 psi | 89% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,811 psi | 89% | 3054 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,463 psi | 87% | 3159 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 56,057 psi | 88% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,579 psi | 89% | 3091 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 54,810 psi | 86% | 3120 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,623 psi | 89% | 3136 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 86% | 57,522 psi | 90% | 3048 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,536 psi | 89% | 3110 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,101 psi | 88% | 3114 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 55,767 psi | 87% | 3117 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,085 psi | 85% | 3133 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,447 psi | 85% | 3205 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3173 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,391 psi | 88% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,578 psi | 86% | 3140 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3304 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,637 psi | 89% | 3133 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% | 31,082 psi | 49% | 2602 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 42,308 psi | 66% | 2890 fps | 99.7% |
| Accurate High Country | <<locked>> | 86% | 42,235 psi | 66% | 2979 fps | 95.4% |
| Accurate MAGPRO | 72.3 gr | 90% | 45,963 psi | 72% | 3045 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 50,879 psi | 80% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,159 psi | 60% | 2815 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 44,628 psi | 70% | 2992 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 42,714 psi | 67% | 2940 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 33,257 psi | 52% | 2753 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,377 psi | 60% | 2815 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,793 psi | 81% | 3015 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,843 psi | 64% | 2904 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,297 psi | 74% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,014 psi | 60% | 2808 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,537 psi | 60% | 2861 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,052 psi | 47% | 2638 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,023 psi | 47% | 2651 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,561 psi | 51% | 2769 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,650 psi | 84% | 3087 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 38,189 psi | 60% | 2851 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 52,359 psi | 82% | 3025 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,973 psi | 64% | 2946 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 38,537 psi | 60% | 2861 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,687 psi | 72% | 2904 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 41,002 psi | 64% | 2904 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 52,707 psi | 83% | 3048 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,382 psi | 70% | 2946 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 46,963 psi | 74% | 2966 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 88% | 44,614 psi | 70% | 2936 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,891 psi | 73% | 2982 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,348 psi | 60% | 2782 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,203 psi | 60% | 2936 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 43,729 psi | 69% | 2966 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,456 psi | 43% | 1762 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,505 psi | 84% | 3025 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,307 psi | 65% | 2828 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,239 psi | 74% | 2936 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 40,451 psi | 63% | 2835 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,497 psi | 68% | 2874 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 42,612 psi | 67% | 2959 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 53,693 psi | 84% | 3015 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,570 psi | 70% | 2881 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 42,743 psi | 67% | 2861 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 30,501 psi | 48% | 2585 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 41,118 psi | 64% | 2861 fps | 96% |
| Norma MRP | 64.7 gr | 82% | 35,099 psi | 55% | 2805 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 41,785 psi | 65% | 2881 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 42,482 psi | 67% | 2969 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 40,814 psi | 64% | 2874 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 35,041 psi | 55% | 2762 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 44% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,504 psi | 82% | 3031 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,241 psi | 79% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,366 psi | 66% | 2913 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,741 psi | 64% | 2927 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,027 psi | 55% | 2841 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 49,284 psi | 77% | 2972 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,206 psi | 66% | 2858 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 37,086 psi | 58% | 2785 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 45,687 psi | 72% | 2904 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,570 psi | 70% | 2881 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 53,693 psi | 84% | 3015 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,743 psi | 67% | 2861 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,995 psi | 80% | 3035 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,024 psi | 78% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,540 psi | 68% | 2822 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,407 psi | 62% | 2844 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 49,458 psi | 78% | 2969 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,224 psi | 72% | 2907 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 38,653 psi | 61% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,128 psi | 55% | 2707 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 47,224 psi | 74% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,323 psi | 68% | 2881 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 37,304 psi | 58% | 2753 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 42,670 psi | 67% | 2881 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 33,562 psi | 53% | 2720 fps | 98.5% |
| Vihtavuori N560 | 69.4 gr | 88% | 43,845 psi | 69% | 2995 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 43,540 psi | 68% | 2972 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,467 psi | 67% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,382 psi | 70% | 2946 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,527 psi | 42% | 2625 fps | 98.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,755 psi | 62% | 2815 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 82 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Barnes TTSX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,304 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,304 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Barnes TTSX BT 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.