Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | 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 Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N560.
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% | 55,854 psi | 88% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,710 psi | 89% | 2956 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,305 psi | 90% | 3091 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 54,418 psi | 85% | 3031 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 90% | 57,667 psi | 90% | 3025 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 55,332 psi | 87% | 3031 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,476 psi | 84% | 2995 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,906 psi | 75% | 2956 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,609 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,985 psi | 89% | 3012 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,608 psi | 87% | 3028 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,029 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,768 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 53,780 psi | 84% | 3028 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,666 psi | 89% | 2989 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 54,795 psi | 86% | 3012 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3068 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 55,608 psi | 87% | 3028 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,882 psi | 86% | 2900 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,984 psi | 86% | 3022 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,462 psi | 85% | 2956 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,985 psi | 89% | 2969 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,085 psi | 86% | 2966 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,114 psi | 85% | 2949 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,317 psi | 85% | 2881 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,593 psi | 87% | 3143 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,882 psi | 86% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 58% | 1860 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,739 psi | 89% | 2943 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,217 psi | 88% | 2920 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,956 psi | 89% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,086 psi | 88% | 2949 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 57,276 psi | 90% | 3071 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,395 psi | 68% | 2861 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 57,087 psi | 89% | 2920 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,390 psi | 87% | 2920 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,087 psi | 89% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,114 psi | 85% | 2946 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,729 psi | 69% | 2887 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 55,521 psi | 87% | 3048 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,027 psi | 86% | 2936 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,157 psi | 85% | 3031 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,566 psi | 90% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,695 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,116 psi | 60% | 1903 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,797 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,114 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,362 psi | 88% | 3136 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3091 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 54,795 psi | 86% | 2933 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 56,666 psi | 89% | 3002 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,882 psi | 86% | 2900 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,087 psi | 89% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,390 psi | 87% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,347 psi | 88% | 2877 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,246 psi | 88% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,333 psi | 88% | 2927 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 55,869 psi | 88% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,159 psi | 90% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,174 psi | 90% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,666 psi | 89% | 2930 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,768 psi | 89% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,854 psi | 88% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,709 psi | 87% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,201 psi | 87% | 3045 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,405 psi | 87% | 3028 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3094 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3081 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,086 psi | 88% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,708 psi | 86% | 2959 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,564 psi | 87% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,101 psi | 89% | 2969 fps | 99.9% |
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% | 37,347 psi | 59% | 2602 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 49,705 psi | 78% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 40,422 psi | 63% | 2769 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 41,089 psi | 64% | 2772 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 41,176 psi | 65% | 2726 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 39,450 psi | 62% | 2720 fps | 96% |
| ADI AR 2217 | <<locked>> | 90% | 38,189 psi | 60% | 2690 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 30,284 psi | 47% | 2530 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,500 psi | 74% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,336 psi | 65% | 2723 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,101 psi | 58% | 2667 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,824 psi | 56% | 2625 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,024 psi | 49% | 2539 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,784 psi | 62% | 2779 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,152 psi | 74% | 2815 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 34,592 psi | 54% | 2602 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 35,027 psi | 55% | 2644 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 37,101 psi | 58% | 2667 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 51,590 psi | 81% | 2848 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,434 psi | 57% | 2648 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 51,155 psi | 80% | 2900 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,359 psi | 84% | 2910 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 39,233 psi | 61% | 2661 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,551 psi | 60% | 2644 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,802 psi | 70% | 2730 fps | 100% |
| Hodgdon Retumbo | 63.2 gr | 82% | 32,358 psi | 51% | 2621 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 51,010 psi | 80% | 2930 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,036 psi | 44% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,949 psi | 74% | 2779 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,866 psi | 83% | 2867 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,079 psi | 74% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,828 psi | 64% | 2664 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 38,087 psi | 60% | 2700 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,520 psi | 56% | 2677 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 50,473 psi | 79% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,950 psi | 77% | 2812 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,082 psi | 50% | 2474 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 47,413 psi | 74% | 2828 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 31,227 psi | 49% | 2582 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 39,001 psi | 61% | 2736 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 48,399 psi | 76% | 2831 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,724 psi | 59% | 2707 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 47,297 psi | 74% | 2835 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,386 psi | 49% | 2520 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 45% | 1703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,603 psi | 78% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,863 psi | 75% | 2894 fps | 100% |
| ReloadSwiss RS 76 | 67.7 gr | 82% | 31,502 psi | 49% | 2595 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,785 psi | 64% | 2815 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 42,482 psi | 67% | 2707 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 40,698 psi | 64% | 2710 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 51,590 psi | 81% | 2848 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,473 psi | 79% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,950 psi | 77% | 2812 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,458 psi | 78% | 2769 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,364 psi | 63% | 2703 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 43,279 psi | 68% | 2694 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 45,600 psi | 71% | 2785 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,176 psi | 65% | 2690 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 80% | 53,693 psi | 84% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,879 psi | 78% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,853 psi | 56% | 2562 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 49,153 psi | 77% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,234 psi | 63% | 2703 fps | 100% |
| Vihtavuori N560 | 64 gr | 80% | 39,030 psi | 61% | 2726 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 86% | 39,610 psi | 62% | 2726 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 42,264 psi | 66% | 2831 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 98% | 49,458 psi | 78% | 3015 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,921 psi | 77% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,155 psi | 80% | 2900 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,401 psi | 51% | 2661 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,797 psi | 59% | 2615 fps | 96.9% |
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 | 160gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,143 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 160.0 gr projectile in 0.284" calls for a 1:11.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | 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.