Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Barnes MRX BT 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 High Country, Alliant Reloder-26 and Winchester StaBALL HD.
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% | 56,739 psi | 89% | 3130 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,302 psi | 85% | 3114 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,607 psi | 86% | 3228 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 94% | 55,709 psi | 87% | 3232 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 55,767 psi | 87% | 3077 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,535 psi | 87% | 3176 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 57,043 psi | 89% | 3238 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,674 psi | 75% | 3054 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,337 psi | 66% | 3005 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,927 psi | 89% | 3100 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,593 psi | 87% | 3179 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,608 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,042 psi | 86% | 3163 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,811 psi | 89% | 3228 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,244 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,592 psi | 84% | 3202 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,607 psi | 86% | 3235 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,709 psi | 87% | 3209 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,414 psi | 77% | 3123 fps | 98% |
| Bofors RP5 | <<locked>> | 96% | 56,811 psi | 89% | 3228 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 57,145 psi | 90% | 3120 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3153 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 86% | 56,217 psi | 88% | 3173 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 55,317 psi | 87% | 3123 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 56,971 psi | 89% | 3169 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,724 psi | 87% | 3150 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,680 psi | 87% | 3091 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3271 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 57,072 psi | 89% | 3212 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1982 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,216 psi | 87% | 3100 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,984 psi | 86% | 3087 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 54,810 psi | 86% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,447 psi | 85% | 3094 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 54,694 psi | 86% | 3209 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 55,434 psi | 87% | 3084 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,174 psi | 90% | 3133 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,056 psi | 85% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,202 psi | 88% | 3159 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 37,594 psi | 59% | 2910 fps | 96.7% |
| Norma MRP | <<locked>> | 94% | 56,695 psi | 89% | 3251 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 56,623 psi | 89% | 3153 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,434 psi | 87% | 3232 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 55,564 psi | 87% | 3159 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,708 psi | 84% | 3156 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,536 psi | 59% | 2028 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,231 psi | 88% | 3179 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,491 psi | 85% | 3136 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,826 psi | 89% | 3228 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,301 psi | 84% | 3268 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,109 psi | 75% | 3130 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 82% | 54,592 psi | 86% | 3061 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,826 psi | 89% | 3143 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 54,302 psi | 85% | 3146 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 57,145 psi | 90% | 3120 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,434 psi | 87% | 3084 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,174 psi | 90% | 3133 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,405 psi | 88% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,766 psi | 86% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,737 psi | 86% | 3031 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,740 psi | 90% | 3205 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 54,375 psi | 85% | 3054 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,694 psi | 86% | 3071 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 56,927 psi | 89% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,955 psi | 86% | 3117 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 55,593 psi | 87% | 3025 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,853 psi | 86% | 3091 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,476 psi | 85% | 3094 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 54,114 psi | 85% | 3094 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,304 psi | 88% | 3173 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,579 psi | 89% | 3248 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3222 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,447 psi | 85% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,463 psi | 88% | 3176 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,854 psi | 88% | 3284 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,882 psi | 86% | 3114 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% | 32,401 psi | 51% | 2638 fps | 96.1% |
| Accurate 4350 | <<locked>> | 80% | 43,947 psi | 69% | 2927 fps | 99.8% |
| Accurate High Country | 68.5 gr | 84% | 40,973 psi | 64% | 2949 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 90% | 48,196 psi | 76% | 3094 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 52,417 psi | 82% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,407 psi | 62% | 2851 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 88% | 43,221 psi | 68% | 2966 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 96% | 41,510 psi | 65% | 2920 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 34,519 psi | 54% | 2799 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,447 psi | 84% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,424 psi | 66% | 2943 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,139 psi | 77% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,494 psi | 62% | 2848 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,449 psi | 59% | 2838 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,198 psi | 49% | 2674 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,109 psi | 46% | 2628 fps | 95.1% |
| Alliant Reloder-26 | 67.2 gr | 80% | 34,156 psi | 54% | 2815 fps | 98.2% |
| Bofors RP15 | <<locked>> | 86% | 37,275 psi | 58% | 2831 fps | 95% |
| Bofors RP30 | <<locked>> | 94% | 39,943 psi | 63% | 2927 fps | 95.3% |
| Bofors RP5 | <<locked>> | 84% | 37,449 psi | 59% | 2838 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 47,137 psi | 74% | 2943 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 39,755 psi | 62% | 2881 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 45,832 psi | 72% | 2982 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 48,588 psi | 76% | 3005 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 46,412 psi | 73% | 2979 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,411 psi | 71% | 2959 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,885 psi | 63% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,275 psi | 58% | 2917 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 45,484 psi | 71% | 3005 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1775 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,641 psi | 67% | 2864 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,646 psi | 76% | 2972 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 41,959 psi | 66% | 2871 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,831 psi | 70% | 2910 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 88% | 41,553 psi | 65% | 2940 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 45,818 psi | 72% | 2910 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,150 psi | 69% | 2897 fps | 98.7% |
| Lovex S071 | <<locked>> | 84% | 31,807 psi | 50% | 2621 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 42,453 psi | 67% | 2897 fps | 96.6% |
| Norma 217 | <<locked>> | 98% | 35,128 psi | 55% | 2844 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 34,011 psi | 53% | 2779 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 43,323 psi | 68% | 2917 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 41,307 psi | 65% | 2949 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 42,192 psi | 66% | 2910 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 36,695 psi | 57% | 2812 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1818 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,315 psi | 82% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,034 psi | 69% | 2949 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,482 psi | 67% | 2966 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,098 psi | 53% | 2818 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 44,498 psi | 70% | 3054 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 50,952 psi | 80% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,944 psi | 64% | 2835 fps | 95% |
| Rottweil R 905 | <<locked>> | 82% | 38,653 psi | 61% | 2828 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 47,137 psi | 74% | 2943 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,818 psi | 72% | 2910 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,150 psi | 69% | 2897 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,518 psi | 82% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,387 psi | 81% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,846 psi | 70% | 2854 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,319 psi | 60% | 2822 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 50,865 psi | 80% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,599 psi | 70% | 2881 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 40,277 psi | 63% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,579 psi | 57% | 2746 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 48,747 psi | 76% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,802 psi | 70% | 2913 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 36,216 psi | 57% | 2730 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 44,237 psi | 69% | 2917 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 35,070 psi | 55% | 2759 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 88% | 45,687 psi | 72% | 3041 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 92% | 42,395 psi | 66% | 2953 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,121 psi | 69% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,050 psi | 72% | 2989 fps | 98.9% |
| Winchester StaBALL HD | 64.5 gr | 80% | 27,586 psi | 43% | 2671 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,464 psi | 60% | 2789 fps | 95.5% |
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 | 140gr | Barnes MRX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,284 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 140.0 gr projectile in 0.284" calls for a 1:11.5 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 High Country, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 Enduron 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.