Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Sierra GameKing 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, Hodgdon Retumbo 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>> | 92% | 54,244 psi | 85% | 2999 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,216 psi | 87% | 3025 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,753 psi | 87% | 3153 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 56,594 psi | 89% | 3156 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 55,999 psi | 88% | 3087 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 57,595 psi | 90% | 3156 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,924 psi | 81% | 3051 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,325 psi | 73% | 3009 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,115 psi | 88% | 3084 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,319 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,564 psi | 87% | 3074 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,740 psi | 90% | 3150 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,361 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,737 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,898 psi | 88% | 3153 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,405 psi | 87% | 3051 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 56,884 psi | 89% | 3133 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3123 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 57,740 psi | 90% | 3150 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 57,246 psi | 90% | 3028 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3143 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 56,768 psi | 89% | 3084 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,521 psi | 87% | 3038 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 57,406 psi | 90% | 3087 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,202 psi | 88% | 3068 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,463 psi | 88% | 3002 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3264 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,348 psi | 90% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 58% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,434 psi | 87% | 3012 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,172 psi | 86% | 2995 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,506 psi | 87% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,679 psi | 86% | 3012 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,477 psi | 87% | 3130 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,887 psi | 66% | 2907 fps | 96.7% |
| Lovex S065 | <<locked>> | 84% | 55,927 psi | 88% | 2992 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,551 psi | 90% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,434 psi | 87% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,550 psi | 89% | 3071 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 42,105 psi | 66% | 2933 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 53,983 psi | 85% | 3110 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,145 psi | 90% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,492 psi | 89% | 3156 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,202 psi | 88% | 3071 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,940 psi | 86% | 3084 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 60% | 1969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,172 psi | 86% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,421 psi | 90% | 3136 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,418 psi | 85% | 3196 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,606 psi | 84% | 3146 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 90% | 57,058 psi | 89% | 3058 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 55,201 psi | 87% | 3068 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 57,246 psi | 90% | 3028 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,927 psi | 88% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,551 psi | 90% | 3041 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,911 psi | 86% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,781 psi | 86% | 3061 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 54,911 psi | 86% | 2989 fps | 98.4% |
| Somchem S365 | <<locked>> | 86% | 54,244 psi | 85% | 3012 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,738 psi | 87% | 3038 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,796 psi | 87% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,303 psi | 87% | 2999 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,201 psi | 87% | 3015 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 54,476 psi | 85% | 3002 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,464 psi | 90% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,493 psi | 90% | 3169 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 57,435 psi | 90% | 3146 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3150 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,737 psi | 86% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,956 psi | 89% | 3087 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,566 psi | 90% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,463 psi | 87% | 3031 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% | 36,187 psi | 57% | 2651 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 48,283 psi | 76% | 2913 fps | 100% |
| Accurate High Country | 65.4 gr | 80% | 39,204 psi | 61% | 2822 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 84% | 42,569 psi | 67% | 2884 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 40,016 psi | 63% | 2782 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 40,973 psi | 64% | 2835 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 39,653 psi | 62% | 2799 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 31,328 psi | 49% | 2628 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,992 psi | 72% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,301 psi | 84% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,190 psi | 63% | 2779 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,897 psi | 56% | 2713 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,679 psi | 54% | 2677 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,095 psi | 47% | 2582 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,305 psi | 60% | 2828 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 48,921 psi | 77% | 2927 fps | 95% |
| Bofors RP15 | <<locked>> | 82% | 35,766 psi | 56% | 2710 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 38,754 psi | 61% | 2812 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 35,897 psi | 56% | 2713 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 50,430 psi | 79% | 2913 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 37,855 psi | 59% | 2756 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 49,719 psi | 78% | 2966 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 52,025 psi | 82% | 2976 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 40,799 psi | 64% | 2776 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,975 psi | 67% | 2822 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,424 psi | 68% | 2792 fps | 100% |
| Hodgdon Retumbo | 66.1 gr | 84% | 33,504 psi | 53% | 2726 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 49,632 psi | 78% | 2992 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 44% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,818 psi | 72% | 2841 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,735 psi | 81% | 2936 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 45,614 psi | 71% | 2851 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,511 psi | 67% | 2776 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 84% | 39,537 psi | 62% | 2812 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,218 psi | 61% | 2844 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 49,342 psi | 77% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,776 psi | 75% | 2877 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 31,169 psi | 49% | 2523 fps | 96.5% |
| Norma 204 | <<locked>> | 80% | 46,050 psi | 72% | 2887 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 32,198 psi | 50% | 2680 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 37,753 psi | 59% | 2789 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 47,094 psi | 74% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,233 psi | 61% | 2818 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,919 psi | 72% | 2894 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 32,590 psi | 51% | 2621 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 45% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,225 psi | 76% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,224 psi | 72% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,706 psi | 51% | 2703 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,598 psi | 67% | 2930 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 41,394 psi | 65% | 2759 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 39,508 psi | 62% | 2762 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 50,430 psi | 79% | 2913 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,342 psi | 77% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,776 psi | 75% | 2877 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,312 psi | 76% | 2831 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,189 psi | 61% | 2759 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 42,032 psi | 66% | 2746 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,208 psi | 69% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,987 psi | 63% | 2743 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,475 psi | 82% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,588 psi | 76% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,795 psi | 55% | 2612 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 47,834 psi | 75% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,841 psi | 61% | 2756 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 40,553 psi | 64% | 2841 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 40,944 psi | 64% | 2835 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 43,816 psi | 69% | 2943 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,587 psi | 75% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,922 psi | 78% | 2966 fps | 99.7% |
| Winchester StaBALL HD | 64.7 gr | 80% | 30,879 psi | 48% | 2703 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,608 psi | 57% | 2664 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 72 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,264 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,264 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 1:12.0 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, Hodgdon Retumbo, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Sierra GameKing 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.