Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 165gr | Geco SOFTPOINT bullet and 70 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% | 55,071 psi | 86% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,825 psi | 87% | 2904 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,637 psi | 89% | 3038 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 57,740 psi | 90% | 3048 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 88% | 56,507 psi | 89% | 2969 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 54,723 psi | 86% | 2986 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3009 fps | 99.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,039 psi | 80% | 2972 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,782 psi | 89% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,739 psi | 89% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,144 psi | 88% | 2959 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,114 psi | 86% | 2979 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,637 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,333 psi | 88% | 3012 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,188 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 3038 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,622 psi | 87% | 2943 fps | 97.8% |
| Bofors RP15 | <<locked>> | 92% | 54,331 psi | 85% | 2966 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 56,101 psi | 88% | 3025 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 55,114 psi | 86% | 2979 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,217 psi | 90% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,201 psi | 85% | 2972 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,261 psi | 90% | 2963 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,128 psi | 85% | 2917 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,942 psi | 89% | 2959 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,927 psi | 89% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,172 psi | 86% | 3094 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 59% | 1844 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,666 psi | 87% | 2894 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,014 psi | 88% | 2894 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,868 psi | 86% | 2897 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 56,695 psi | 89% | 3025 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,456 psi | 73% | 2881 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 55,999 psi | 88% | 2867 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,418 psi | 85% | 2867 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,478 psi | 89% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,739 psi | 89% | 2949 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,253 psi | 74% | 2913 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 54,897 psi | 86% | 2995 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,114 psi | 85% | 2884 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,490 psi | 84% | 2982 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,550 psi | 89% | 2949 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,999 psi | 88% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 60% | 1886 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,941 psi | 88% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,273 psi | 85% | 2956 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,072 psi | 88% | 3091 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,143 psi | 86% | 3048 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 57,334 psi | 90% | 2936 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 55,854 psi | 88% | 2953 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,217 psi | 90% | 2904 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,999 psi | 88% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,418 psi | 85% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,897 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,434 psi | 87% | 2946 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 55,303 psi | 87% | 2877 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 55,114 psi | 86% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,304 psi | 88% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,666 psi | 87% | 2877 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,057 psi | 88% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 54,897 psi | 86% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,172 psi | 86% | 2920 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,520 psi | 85% | 2995 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 54,911 psi | 86% | 2982 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 55,825 psi | 87% | 3048 fps | 98.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,014 psi | 89% | 3114 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,984 psi | 86% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,261 psi | 90% | 2963 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,579 psi | 87% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,028 psi | 88% | 2917 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% | 39,334 psi | 62% | 2608 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 52,127 psi | 82% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,989 psi | 67% | 2789 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 40,509 psi | 63% | 2726 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 43,381 psi | 68% | 2740 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 38,769 psi | 61% | 2671 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 35,273 psi | 55% | 2585 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 82% | 28,079 psi | 44% | 2428 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,729 psi | 69% | 2736 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,937 psi | 78% | 2854 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,323 psi | 68% | 2730 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,291 psi | 62% | 2680 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,145 psi | 60% | 2635 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,880 psi | 52% | 2559 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,366 psi | 66% | 2789 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,209 psi | 72% | 2897 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,122 psi | 72% | 2766 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 36,535 psi | 57% | 2615 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 34,867 psi | 55% | 2605 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 39,291 psi | 62% | 2680 fps | 97.8% |
| Bofors RP7 | <<locked>> | 80% | 53,867 psi | 84% | 2851 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,518 psi | 53% | 2543 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 53,621 psi | 84% | 2904 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,307 psi | 65% | 2677 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,611 psi | 64% | 2661 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,065 psi | 74% | 2730 fps | 100% |
| Hodgdon Retumbo | 63.3 gr | 80% | 32,140 psi | 50% | 2585 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,139 psi | 77% | 2785 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 49,298 psi | 77% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,757 psi | 67% | 2674 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 37,463 psi | 59% | 2654 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,563 psi | 56% | 2644 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 52,750 psi | 83% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,995 psi | 80% | 2812 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,968 psi | 53% | 2487 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 49,676 psi | 78% | 2835 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 29,153 psi | 46% | 2487 fps | 95% |
| Norma MRP | <<locked>> | 80% | 41,553 psi | 65% | 2756 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 50,633 psi | 79% | 2831 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,188 psi | 58% | 2661 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 49,676 psi | 78% | 2838 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,257 psi | 52% | 2539 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 45% | 1690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,170 psi | 82% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,488 psi | 79% | 2894 fps | 100% |
| ReloadSwiss RS 76 | 67.7 gr | 80% | 31,125 psi | 49% | 2556 fps | 96.7% |
| ReloadSwiss RS 80 | 76.8 gr | 90% | 40,712 psi | 64% | 2776 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 44,382 psi | 70% | 2713 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 42,772 psi | 67% | 2717 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 80% | 53,867 psi | 84% | 2851 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,750 psi | 83% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,995 psi | 80% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,590 psi | 81% | 2769 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,453 psi | 67% | 2713 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 45,208 psi | 71% | 2700 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 48,269 psi | 76% | 2785 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,323 psi | 68% | 2697 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 52,112 psi | 82% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,695 psi | 59% | 2572 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 80% | 51,488 psi | 81% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,482 psi | 67% | 2707 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,452 psi | 65% | 2746 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 36,535 psi | 57% | 2618 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 90% | 41,989 psi | 66% | 2789 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 49,327 psi | 77% | 2976 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,329 psi | 80% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,621 psi | 84% | 2904 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,128 psi | 55% | 2677 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,827 psi | 62% | 2628 fps | 97.9% |
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 70 powders for 7 x 66 SE v. Hofe loaded with the .284 | 165gr | Geco SOFTPOINT. Vihtavuori N570 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,114 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 165.0 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, ReloadSwiss RS 80 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 165gr | Geco SOFTPOINT 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.