Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 173gr | Sellier & Bellot SPCE 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 ReloadSwiss RS 80.
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>> | 90% | 55,361 psi | 87% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,217 psi | 88% | 2841 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,058 psi | 89% | 2979 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 54,273 psi | 85% | 2930 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 88% | 56,913 psi | 89% | 2910 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,100 psi | 86% | 2923 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 2953 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,530 psi | 78% | 2923 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2917 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,174 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,363 psi | 90% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,536 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,463 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,942 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,724 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,606 psi | 84% | 2913 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 2982 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,941 psi | 88% | 2884 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,694 psi | 86% | 2904 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,652 psi | 89% | 2966 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,463 psi | 87% | 2920 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,696 psi | 90% | 2838 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,636 psi | 86% | 2917 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,711 psi | 90% | 2897 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,621 psi | 86% | 2858 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,319 psi | 90% | 2897 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,363 psi | 90% | 2812 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,622 psi | 87% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 59% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,043 psi | 88% | 2831 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,463 psi | 88% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,216 psi | 87% | 2835 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 57,174 psi | 90% | 2966 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,920 psi | 74% | 2828 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,478 psi | 89% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,679 psi | 86% | 2805 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,811 psi | 89% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,072 psi | 89% | 2887 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,572 psi | 75% | 2854 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,317 psi | 87% | 2933 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,433 psi | 85% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,041 psi | 85% | 2923 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,898 psi | 89% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,594 psi | 89% | 2913 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 1837 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,275 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,708 psi | 86% | 2890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,347 psi | 88% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,622 psi | 87% | 2992 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 54,128 psi | 85% | 2822 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,246 psi | 88% | 2890 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,696 psi | 90% | 2838 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,478 psi | 89% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,679 psi | 86% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,434 psi | 87% | 2762 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,840 psi | 88% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,622 psi | 87% | 2818 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,608 psi | 87% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,550 psi | 89% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,028 psi | 88% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,434 psi | 88% | 2844 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,129 psi | 86% | 2861 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 55,317 psi | 87% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,550 psi | 87% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,911 psi | 86% | 2936 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 55,550 psi | 87% | 2927 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 56,376 psi | 88% | 2992 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3051 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,405 psi | 87% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,711 psi | 90% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,275 psi | 88% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,420 psi | 88% | 2858 fps | 100% |
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% | 39,784 psi | 62% | 2559 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 52,634 psi | 82% | 2789 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,236 psi | 68% | 2733 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 40,785 psi | 64% | 2674 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,816 psi | 69% | 2684 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 39,189 psi | 61% | 2625 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 86% | 35,636 psi | 56% | 2543 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 45,948 psi | 72% | 2851 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 28,456 psi | 45% | 2392 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,135 psi | 69% | 2684 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,343 psi | 79% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,729 psi | 69% | 2677 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,740 psi | 62% | 2631 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,522 psi | 60% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,243 psi | 52% | 2513 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,931 psi | 67% | 2736 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,308 psi | 68% | 2779 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,569 psi | 68% | 2654 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,898 psi | 58% | 2569 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 32,822 psi | 51% | 2497 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 39,740 psi | 62% | 2631 fps | 98.3% |
| Bofors RP7 | <<locked>> | 80% | 54,230 psi | 85% | 2785 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,823 psi | 53% | 2497 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,983 psi | 85% | 2841 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,771 psi | 65% | 2625 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,031 psi | 64% | 2612 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,384 psi | 74% | 2671 fps | 100% |
| Hodgdon Retumbo | 61.5 gr | 80% | 32,372 psi | 51% | 2539 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,530 psi | 78% | 2726 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,734 psi | 78% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,105 psi | 68% | 2621 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 37,898 psi | 59% | 2605 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,518 psi | 53% | 2536 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,098 psi | 83% | 2756 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,401 psi | 81% | 2753 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,374 psi | 54% | 2441 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 50,024 psi | 78% | 2776 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,530 psi | 46% | 2448 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 41,771 psi | 65% | 2697 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 51,082 psi | 80% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,536 psi | 59% | 2608 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 80% | 50,024 psi | 78% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,620 psi | 53% | 2493 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 45% | 1640 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,591 psi | 82% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,995 psi | 80% | 2838 fps | 100% |
| ReloadSwiss RS 76 | 65.8 gr | 80% | 31,372 psi | 49% | 2510 fps | 97.4% |
| ReloadSwiss RS 80 | 73 gr | 88% | 38,116 psi | 60% | 2661 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,744 psi | 70% | 2657 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,192 psi | 68% | 2664 fps | 99% |
| Rottweil R 907 | <<locked>> | 80% | 54,230 psi | 85% | 2785 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,098 psi | 83% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,401 psi | 81% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,822 psi | 81% | 2707 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,859 psi | 67% | 2661 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 45,629 psi | 72% | 2648 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 48,733 psi | 76% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,787 psi | 69% | 2644 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,576 psi | 82% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,072 psi | 60% | 2523 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 51,547 psi | 81% | 2802 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 51,793 psi | 81% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,888 psi | 67% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,640 psi | 65% | 2690 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 80% | 34,577 psi | 54% | 2513 fps | 95% |
| Vihtavuori N568 | <<locked>> | 88% | 39,552 psi | 62% | 2677 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 46,282 psi | 73% | 2854 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,634 psi | 81% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,215 psi | 85% | 2848 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,607 psi | 56% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,103 psi | 63% | 2575 fps | 98.3% |
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 | 173gr | Sellier & Bellot SPCE. Vihtavuori N570 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,051 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 59–90 %, leaving at least 10 % headroom. The 173.0 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 2218, ADI AR 2225 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, ReloadSwiss RS 80 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 173gr | Sellier & Bellot SPCE 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.