Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Remington PSP bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand 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>> | 94% | 56,768 psi | 89% | 3130 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,012 psi | 85% | 3107 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,418 psi | 85% | 3225 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 92% | 55,288 psi | 87% | 3225 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 90% | 54,781 psi | 86% | 3163 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 56,507 psi | 89% | 3232 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,676 psi | 79% | 3117 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,498 psi | 71% | 3077 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,955 psi | 86% | 3169 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,985 psi | 88% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,389 psi | 85% | 3150 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,565 psi | 89% | 3225 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,128 psi | 85% | 3140 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3261 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,534 psi | 85% | 3228 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,550 psi | 87% | 3205 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,272 psi | 83% | 3196 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 56,565 psi | 89% | 3225 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 56,115 psi | 88% | 3107 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,057 psi | 88% | 3215 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,724 psi | 87% | 3163 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 54,563 psi | 86% | 3117 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 56,463 psi | 88% | 3166 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,288 psi | 87% | 3146 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,230 psi | 87% | 3084 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3340 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,347 psi | 88% | 3199 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1998 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,360 psi | 85% | 3091 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,653 psi | 90% | 3130 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 54,520 psi | 85% | 3100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,334 psi | 90% | 3146 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 54,375 psi | 85% | 3205 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 54,824 psi | 86% | 3074 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,666 psi | 89% | 3127 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 54,244 psi | 85% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,448 psi | 87% | 3150 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,075 psi | 64% | 2992 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 56,594 psi | 89% | 3248 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,159 psi | 88% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,085 psi | 86% | 3225 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 55,027 psi | 86% | 3150 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,606 psi | 84% | 3156 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 2044 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,998 psi | 85% | 3127 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,202 psi | 88% | 3219 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3340 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,272 psi | 82% | 3212 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 57,740 psi | 90% | 3107 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,956 psi | 88% | 3130 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 57,696 psi | 90% | 3202 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,115 psi | 88% | 3107 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,824 psi | 86% | 3074 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,666 psi | 89% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,203 psi | 90% | 2966 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,740 psi | 90% | 3081 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,246 psi | 90% | 3199 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,130 psi | 90% | 3100 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,085 psi | 85% | 3061 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 56,623 psi | 89% | 3146 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,476 psi | 85% | 3110 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 54,984 psi | 86% | 3015 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,215 psi | 85% | 3081 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,186 psi | 85% | 3091 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 57,029 psi | 89% | 3140 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,362 psi | 88% | 3169 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,275 psi | 88% | 3245 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 56,420 psi | 88% | 3222 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3215 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,551 psi | 90% | 3087 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,724 psi | 87% | 3163 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,057 psi | 88% | 3281 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,491 psi | 85% | 3107 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% | 35,273 psi | 55% | 2710 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 47,166 psi | 74% | 2986 fps | 100% |
| Accurate High Country | 69.1 gr | 82% | 41,075 psi | 64% | 2949 fps | 95.4% |
| Accurate MAGPRO | 73.8 gr | 86% | 44,701 psi | 70% | 3018 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 39,175 psi | 61% | 2844 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 86% | 43,004 psi | 67% | 2963 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 41,350 psi | 65% | 2917 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 32,648 psi | 51% | 2740 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,049 psi | 71% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,141 psi | 82% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,320 psi | 62% | 2841 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,608 psi | 59% | 2838 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,837 psi | 53% | 2740 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,399 psi | 46% | 2631 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,159 psi | 58% | 2887 fps | 99.1% |
| Bofors RP15 | <<locked>> | 84% | 37,449 psi | 59% | 2831 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 40,538 psi | 64% | 2936 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 37,608 psi | 59% | 2838 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,588 psi | 78% | 2989 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 39,711 psi | 62% | 2881 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,791 psi | 76% | 3038 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 51,169 psi | 80% | 3054 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 42,917 psi | 67% | 2904 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,092 psi | 71% | 2953 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,569 psi | 67% | 2867 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,434 psi | 59% | 2920 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 48,530 psi | 76% | 3064 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 44% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,947 psi | 70% | 2913 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,894 psi | 80% | 3018 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 44,846 psi | 70% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,367 psi | 70% | 2904 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 41,307 psi | 65% | 2936 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 48,530 psi | 76% | 2963 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 46,862 psi | 73% | 2949 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 30,385 psi | 48% | 2575 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 45,165 psi | 71% | 2956 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 33,475 psi | 52% | 2792 fps | 95% |
| Norma MRP | <<locked>> | 80% | 36,811 psi | 58% | 2848 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 46,137 psi | 72% | 2972 fps | 100% |
| Ramshot Grand | 71.8 gr | 86% | 41,075 psi | 64% | 2943 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,034 psi | 71% | 2966 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 34,272 psi | 54% | 2746 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1834 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,195 psi | 74% | 3009 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,281 psi | 71% | 3025 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,287 psi | 54% | 2825 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,788 psi | 70% | 3058 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 54,128 psi | 85% | 3054 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,611 psi | 64% | 2828 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,638 psi | 61% | 2825 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,588 psi | 78% | 2989 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,530 psi | 76% | 2963 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 46,862 psi | 73% | 2949 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,838 psi | 84% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,442 psi | 74% | 2904 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,305 psi | 60% | 2818 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 53,795 psi | 84% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,179 psi | 69% | 2874 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 43,149 psi | 68% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,233 psi | 61% | 2808 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 51,547 psi | 81% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,587 psi | 75% | 2966 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,332 psi | 57% | 2730 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 46,992 psi | 74% | 2969 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,913 psi | 59% | 2822 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 42,453 psi | 67% | 2966 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 42,772 psi | 67% | 2959 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 46,021 psi | 72% | 3071 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,731 psi | 73% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,791 psi | 76% | 3038 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,124 psi | 47% | 2753 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,406 psi | 60% | 2785 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 79 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Remington PSP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,340 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,340 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 1:15.0 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. Accurate MAGPRO, Ramshot Grand, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Remington PSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 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.