Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Osprey Virtus bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 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>> | 96% | 56,913 psi | 89% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,389 psi | 85% | 3012 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,781 psi | 86% | 3133 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 94% | 55,680 psi | 87% | 3136 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 55,840 psi | 88% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,593 psi | 87% | 3074 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 96% | 57,290 psi | 90% | 3143 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2963 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,366 psi | 66% | 2920 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,825 psi | 87% | 3071 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,825 psi | 87% | 3071 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,072 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,695 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,898 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,129 psi | 86% | 3061 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,101 psi | 89% | 3136 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,273 psi | 85% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,780 psi | 84% | 3107 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,520 psi | 85% | 3133 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,550 psi | 87% | 3038 fps | 96.3% |
| Bofors RP15 | <<locked>> | 98% | 55,927 psi | 88% | 3117 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,647 psi | 78% | 3038 fps | 98.4% |
| Bofors RP5 | <<locked>> | 96% | 57,101 psi | 89% | 3136 fps | 99.7% |
| Bofors RP7 | <<locked>> | 86% | 57,087 psi | 89% | 3015 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 3061 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 86% | 56,521 psi | 89% | 3074 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 55,564 psi | 87% | 3028 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 94% | 57,130 psi | 90% | 3074 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,811 psi | 87% | 3054 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,840 psi | 88% | 2989 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3176 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 57,203 psi | 90% | 3114 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 58% | 1900 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,405 psi | 87% | 3002 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,303 psi | 87% | 2989 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 55,027 psi | 86% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,476 psi | 85% | 2995 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 54,897 psi | 86% | 3114 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 55,608 psi | 87% | 2982 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,319 psi | 90% | 3035 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,085 psi | 85% | 2992 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,188 psi | 88% | 3061 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 37,666 psi | 59% | 2831 fps | 97.4% |
| Norma MRP | <<locked>> | 94% | 56,782 psi | 89% | 3156 fps | 100% |
| Norma URP | <<locked>> | 88% | 56,768 psi | 89% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,680 psi | 87% | 3136 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 55,608 psi | 87% | 3058 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,722 psi | 84% | 3061 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 1946 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,347 psi | 88% | 3074 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,650 psi | 86% | 3038 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,072 psi | 89% | 3130 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,156 psi | 83% | 3169 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,051 psi | 75% | 3045 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 54,795 psi | 86% | 2959 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,826 psi | 89% | 3041 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 54,563 psi | 86% | 3051 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 57,087 psi | 89% | 3015 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,608 psi | 87% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,319 psi | 90% | 3035 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,376 psi | 88% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,897 psi | 86% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,071 psi | 86% | 2936 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,128 psi | 85% | 3045 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 54,520 psi | 85% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,853 psi | 86% | 2976 fps | 98.1% |
| Somchem S365 | <<locked>> | 90% | 57,087 psi | 89% | 3051 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,853 psi | 86% | 3018 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 55,695 psi | 87% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,969 psi | 86% | 2989 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,665 psi | 86% | 3002 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 57,696 psi | 90% | 3048 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,420 psi | 88% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,681 psi | 89% | 3150 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3123 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,255 psi | 77% | 3048 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,578 psi | 86% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,739 psi | 89% | 3077 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,637 psi | 87% | 3182 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,085 psi | 86% | 3018 fps | 99.4% |
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% | 32,489 psi | 51% | 2562 fps | 96.7% |
| Accurate 4350 | <<locked>> | 80% | 44,063 psi | 69% | 2835 fps | 100% |
| Accurate High Country | 65.4 gr | 84% | 41,191 psi | 65% | 2867 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 88% | 44,744 psi | 70% | 2930 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 52,533 psi | 82% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,970 psi | 58% | 2703 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 40,437 psi | 63% | 2815 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 41,582 psi | 65% | 2835 fps | 96% |
| ADI AR 2225 | <<locked>> | 92% | 32,489 psi | 51% | 2661 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,275 psi | 58% | 2707 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,275 psi | 58% | 2707 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,708 psi | 84% | 2946 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,598 psi | 67% | 2848 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,342 psi | 77% | 2972 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,898 psi | 58% | 2697 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,652 psi | 59% | 2756 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,386 psi | 49% | 2595 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,254 psi | 46% | 2556 fps | 96% |
| Alliant Reloder-26 | 64.1 gr | 80% | 34,272 psi | 54% | 2736 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,083 psi | 82% | 2976 fps | 95.4% |
| Bofors RP15 | <<locked>> | 86% | 37,333 psi | 59% | 2746 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 37,449 psi | 59% | 2782 fps | 95% |
| Bofors RP5 | <<locked>> | 84% | 37,652 psi | 59% | 2756 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 47,108 psi | 74% | 2844 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 37,231 psi | 58% | 2733 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 46,064 psi | 72% | 2890 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 48,791 psi | 76% | 2910 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 43,250 psi | 68% | 2822 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,453 psi | 67% | 2805 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,045 psi | 63% | 2726 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,998 psi | 55% | 2769 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 45,556 psi | 71% | 2913 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 43% | 1699 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,728 psi | 67% | 2772 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,631 psi | 76% | 2874 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 42,206 psi | 66% | 2785 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 42,221 psi | 66% | 2762 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 88% | 41,597 psi | 65% | 2854 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 45,977 psi | 72% | 2818 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 44,367 psi | 70% | 2805 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 29,820 psi | 47% | 2487 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 42,685 psi | 67% | 2812 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 32,909 psi | 52% | 2703 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 34,142 psi | 54% | 2697 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 43,569 psi | 68% | 2828 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 38,334 psi | 60% | 2792 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 42,453 psi | 67% | 2822 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 34,127 psi | 53% | 2664 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 44% | 1742 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,489 psi | 82% | 3018 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,193 psi | 69% | 2858 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,511 psi | 67% | 2874 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,749 psi | 50% | 2667 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 44,498 psi | 70% | 2972 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 51,227 psi | 80% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,089 psi | 64% | 2746 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 36,187 psi | 57% | 2680 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 47,108 psi | 74% | 2844 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,977 psi | 72% | 2818 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 44,367 psi | 70% | 2805 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,837 psi | 83% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,590 psi | 81% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,121 psi | 71% | 2766 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,897 psi | 56% | 2677 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 51,039 psi | 80% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,727 psi | 65% | 2733 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 40,393 psi | 63% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,709 psi | 58% | 2664 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 48,994 psi | 77% | 2822 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,918 psi | 70% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,924 psi | 53% | 2589 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 44,251 psi | 69% | 2825 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 35,273 psi | 55% | 2677 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 42,714 psi | 67% | 2887 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 42,656 psi | 67% | 2871 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 98% | 45,716 psi | 72% | 2979 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,193 psi | 69% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,296 psi | 73% | 2894 fps | 99.2% |
| Winchester StaBALL HD | 61.6 gr | 80% | 27,789 psi | 44% | 2602 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,897 psi | 56% | 2644 fps | 95.2% |
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 80 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | Osprey Virtus. Winchester StaBALL HD delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,182 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 1:9.0 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 High Country, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Osprey Virtus 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.