Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Sierra MatchKing bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Winchester StaBALL HD and Hodgdon Retumbo.
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% | 57,537 psi | 90% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,882 psi | 86% | 3022 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,419 psi | 87% | 3146 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 92% | 56,289 psi | 88% | 3150 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 55,680 psi | 87% | 3081 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 57,305 psi | 90% | 3150 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 3045 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,108 psi | 72% | 3002 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,999 psi | 88% | 3084 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,971 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,288 psi | 87% | 3071 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,406 psi | 90% | 3143 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,027 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,447 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,608 psi | 87% | 3146 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,187 psi | 86% | 3045 fps | 96.6% |
| Bofors RP15 | <<locked>> | 96% | 56,565 psi | 89% | 3130 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 3120 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 57,406 psi | 90% | 3143 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 56,913 psi | 89% | 3022 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 3136 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 56,681 psi | 89% | 3081 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,419 psi | 87% | 3035 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 57,145 psi | 90% | 3084 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,159 psi | 88% | 3068 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,101 psi | 88% | 2999 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3258 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,305 psi | 90% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 58% | 1923 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,143 psi | 86% | 3005 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,882 psi | 86% | 2989 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,390 psi | 87% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,375 psi | 85% | 3005 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,405 psi | 87% | 3127 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,655 psi | 65% | 2900 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 55,637 psi | 87% | 2989 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,493 psi | 90% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,129 psi | 86% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,260 psi | 88% | 3068 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 41,829 psi | 66% | 2930 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 57,522 psi | 90% | 3169 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,014 psi | 89% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,188 psi | 88% | 3150 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 55,912 psi | 88% | 3068 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,636 psi | 86% | 3077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,058 psi | 60% | 1969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,085 psi | 86% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,319 psi | 90% | 3133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,172 psi | 85% | 3189 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,084 psi | 83% | 3136 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 90% | 56,782 psi | 89% | 3048 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 54,911 psi | 86% | 3061 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,913 psi | 89% | 3022 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,637 psi | 87% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,493 psi | 90% | 3041 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,839 psi | 86% | 2940 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,491 psi | 85% | 3058 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 54,679 psi | 86% | 2982 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 57,740 psi | 90% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,405 psi | 87% | 3031 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,724 psi | 87% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,984 psi | 86% | 2992 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,897 psi | 86% | 3009 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 54,389 psi | 85% | 3002 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,363 psi | 90% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,232 psi | 90% | 3166 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 57,145 psi | 90% | 3140 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 3140 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,447 psi | 85% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,681 psi | 89% | 3081 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,188 psi | 90% | 3196 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,201 psi | 87% | 3025 fps | 99.6% |
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% | 35,897 psi | 56% | 2644 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 47,950 psi | 75% | 2907 fps | 100% |
| Accurate High Country | 65.1 gr | 80% | 38,885 psi | 61% | 2815 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 84% | 42,467 psi | 67% | 2884 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 39,914 psi | 63% | 2779 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 40,901 psi | 64% | 2831 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 39,407 psi | 62% | 2792 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 88% | 31,154 psi | 49% | 2621 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,861 psi | 72% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,171 psi | 83% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,929 psi | 63% | 2772 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,810 psi | 56% | 2710 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,563 psi | 54% | 2674 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,994 psi | 47% | 2579 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,029 psi | 60% | 2822 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,967 psi | 81% | 2986 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 35,679 psi | 56% | 2707 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 38,479 psi | 60% | 2805 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 35,810 psi | 56% | 2710 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,343 psi | 79% | 2910 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 37,623 psi | 59% | 2749 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 49,400 psi | 77% | 2956 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 51,938 psi | 81% | 2976 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 40,698 psi | 64% | 2772 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,873 psi | 67% | 2818 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,294 psi | 68% | 2789 fps | 100% |
| Hodgdon Retumbo | 67.5 gr | 86% | 35,766 psi | 56% | 2795 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 49,342 psi | 77% | 2986 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,730 psi | 72% | 2841 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,619 psi | 81% | 2933 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 45,513 psi | 71% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,250 psi | 66% | 2772 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 39,247 psi | 62% | 2805 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,001 psi | 61% | 2838 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 49,269 psi | 77% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,456 psi | 74% | 2871 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,908 psi | 48% | 2513 fps | 96.3% |
| Norma 204 | <<locked>> | 80% | 45,977 psi | 72% | 2884 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 32,010 psi | 50% | 2674 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 37,492 psi | 59% | 2782 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 46,789 psi | 73% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,972 psi | 61% | 2812 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,818 psi | 72% | 2890 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 32,387 psi | 51% | 2618 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,456 psi | 45% | 1759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,921 psi | 75% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,151 psi | 72% | 2949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,503 psi | 51% | 2694 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,337 psi | 66% | 2927 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 41,133 psi | 64% | 2756 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 39,218 psi | 61% | 2756 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,343 psi | 79% | 2910 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,269 psi | 77% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,456 psi | 74% | 2871 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,225 psi | 76% | 2831 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,914 psi | 61% | 2753 fps | 96.7% |
| Somchem S361 | <<locked>> | 80% | 41,959 psi | 66% | 2743 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,092 psi | 69% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,885 psi | 63% | 2740 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 52,141 psi | 82% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,283 psi | 76% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,548 psi | 54% | 2605 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 47,718 psi | 75% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,725 psi | 61% | 2753 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 40,480 psi | 63% | 2838 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 40,683 psi | 64% | 2828 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 94% | 43,569 psi | 68% | 2940 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,529 psi | 74% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,632 psi | 78% | 2963 fps | 99.7% |
| Winchester StaBALL HD | 64.5 gr | 80% | 30,806 psi | 48% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,361 psi | 57% | 2657 fps | 95.6% |
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 72 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,258 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 150.0 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, Bofors RP30 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, Winchester StaBALL HD, Hodgdon Retumbo rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Sierra MatchKing 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.