Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 156gr | Norma ORYX bullet and 74 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% | 56,347 psi | 88% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,290 psi | 90% | 3002 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,215 psi | 85% | 3077 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 90% | 55,042 psi | 86% | 3077 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 88% | 54,433 psi | 85% | 3012 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,999 psi | 88% | 3081 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3038 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 3002 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,491 psi | 85% | 3005 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,636 psi | 86% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,522 psi | 90% | 3054 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,275 psi | 88% | 3074 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,012 psi | 85% | 2982 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,319 psi | 90% | 3104 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,215 psi | 85% | 3071 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 50,807 psi | 80% | 3054 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,159 psi | 90% | 3035 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 55,463 psi | 87% | 3061 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3114 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 56,275 psi | 88% | 3074 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,288 psi | 87% | 2946 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 55,680 psi | 87% | 3068 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,998 psi | 86% | 3002 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,319 psi | 90% | 3012 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,767 psi | 87% | 3015 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,621 psi | 86% | 2995 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,882 psi | 86% | 2927 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,072 psi | 88% | 3186 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,419 psi | 87% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1896 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,188 psi | 90% | 2989 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,579 psi | 89% | 2969 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,450 psi | 90% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,362 psi | 88% | 2992 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 54,027 psi | 85% | 3054 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,034 psi | 69% | 2904 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 57,653 psi | 90% | 2969 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,956 psi | 88% | 2966 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,566 psi | 90% | 2992 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,737 psi | 86% | 2992 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2930 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 56,202 psi | 88% | 3094 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,579 psi | 87% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,810 psi | 86% | 3077 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 54,505 psi | 85% | 2992 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,319 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1939 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,464 psi | 90% | 3028 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,738 psi | 87% | 3054 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,116 psi | 90% | 3182 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3140 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 55,405 psi | 87% | 2979 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 57,246 psi | 90% | 3048 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,288 psi | 87% | 2946 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,653 psi | 90% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,956 psi | 88% | 2966 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,565 psi | 89% | 2917 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,826 psi | 89% | 3041 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,884 psi | 89% | 2972 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 56,376 psi | 88% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,667 psi | 90% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,580 psi | 90% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,188 psi | 90% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,363 psi | 90% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,304 psi | 88% | 2979 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,086 psi | 88% | 3012 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,883 psi | 88% | 3094 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 56,115 psi | 88% | 3074 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3143 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,824 psi | 84% | 3127 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,579 psi | 89% | 2923 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,245 psi | 87% | 3005 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,507 psi | 89% | 3127 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,711 psi | 90% | 3015 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% | 37,565 psi | 59% | 2635 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 49,922 psi | 78% | 2887 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 40,930 psi | 64% | 2812 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 82% | 41,481 psi | 65% | 2812 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 41,582 psi | 65% | 2769 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 39,726 psi | 62% | 2759 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 38,479 psi | 60% | 2726 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 30,545 psi | 48% | 2562 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,916 psi | 66% | 2769 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,834 psi | 75% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,539 psi | 65% | 2762 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,463 psi | 59% | 2707 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,274 psi | 57% | 2664 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,372 psi | 49% | 2579 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,248 psi | 63% | 2818 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,210 psi | 74% | 2986 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,442 psi | 74% | 2858 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 34,983 psi | 55% | 2641 fps | 95.5% |
| Bofors RP30 | <<locked>> | 86% | 35,447 psi | 56% | 2684 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 37,463 psi | 59% | 2707 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 52,025 psi | 82% | 2890 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,724 psi | 58% | 2687 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 51,517 psi | 81% | 2943 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,751 psi | 84% | 2956 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 39,552 psi | 62% | 2700 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,655 psi | 65% | 2746 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,107 psi | 71% | 2772 fps | 100% |
| Hodgdon Retumbo | 65 gr | 82% | 32,779 psi | 51% | 2664 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 51,605 psi | 81% | 2976 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 44% | 1693 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,355 psi | 74% | 2825 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,316 psi | 84% | 2913 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,326 psi | 74% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,162 psi | 65% | 2703 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 38,377 psi | 60% | 2740 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,056 psi | 56% | 2720 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 50,952 psi | 80% | 2861 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,371 psi | 77% | 2858 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,401 psi | 51% | 2510 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 47,718 psi | 75% | 2871 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 31,517 psi | 49% | 2618 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 39,479 psi | 62% | 2779 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 48,863 psi | 77% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,130 psi | 60% | 2746 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 47,630 psi | 75% | 2874 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,589 psi | 50% | 2552 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,154 psi | 79% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,356 psi | 76% | 2936 fps | 100% |
| ReloadSwiss RS 76 | 69.5 gr | 82% | 31,778 psi | 50% | 2631 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,365 psi | 65% | 2858 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 42,728 psi | 67% | 2743 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 41,118 psi | 64% | 2749 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 52,025 psi | 82% | 2890 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,952 psi | 80% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,371 psi | 77% | 2858 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,864 psi | 78% | 2812 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,785 psi | 64% | 2746 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 43,656 psi | 68% | 2736 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 46,079 psi | 72% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,539 psi | 65% | 2730 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 54,157 psi | 85% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,096 psi | 79% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,042 psi | 56% | 2598 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 49,501 psi | 78% | 2871 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,538 psi | 64% | 2743 fps | 100% |
| Vihtavuori N560 | 65.8 gr | 80% | 39,479 psi | 62% | 2769 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 39,943 psi | 63% | 2762 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 92% | 42,757 psi | 67% | 2874 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 98% | 50,198 psi | 79% | 3061 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,313 psi | 77% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,721 psi | 81% | 2949 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,822 psi | 51% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,087 psi | 60% | 2654 fps | 96.8% |
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 74 powders for 7 x 66 SE v. Hofe loaded with the .284 | 156gr | Norma ORYX. Hodgdon Retumbo delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,186 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 156.0 gr projectile in 0.284" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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 | 156gr | Norma ORYX 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.