Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 155gr | Geco EXPRESS bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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% | 54,288 psi | 85% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,477 psi | 87% | 2982 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,898 psi | 88% | 3110 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 92% | 56,840 psi | 89% | 3114 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 90% | 56,188 psi | 88% | 3041 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 54,085 psi | 85% | 3051 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3009 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,615 psi | 73% | 2969 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,434 psi | 88% | 3038 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,362 psi | 88% | 3038 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,421 psi | 90% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,767 psi | 87% | 3031 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,259 psi | 85% | 3045 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,622 psi | 87% | 3015 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,969 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,144 psi | 88% | 3107 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,637 psi | 87% | 3009 fps | 96.9% |
| Bofors RP15 | <<locked>> | 96% | 57,014 psi | 89% | 3087 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3084 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 54,259 psi | 85% | 3045 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 57,377 psi | 90% | 2979 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3097 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 57,058 psi | 89% | 3038 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,724 psi | 87% | 2992 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 53,882 psi | 84% | 2982 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,492 psi | 89% | 3025 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,710 psi | 89% | 2956 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,809 psi | 84% | 3156 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,667 psi | 90% | 3077 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,695 psi | 87% | 2969 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,259 psi | 87% | 2946 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,796 psi | 87% | 2972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,839 psi | 86% | 2966 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 55,840 psi | 88% | 3091 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,134 psi | 66% | 2867 fps | 97.1% |
| Lovex S065 | <<locked>> | 84% | 56,072 psi | 88% | 2946 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,375 psi | 85% | 2943 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,521 psi | 87% | 2969 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,739 psi | 89% | 3028 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 42,337 psi | 66% | 2897 fps | 99% |
| Norma MRP | <<locked>> | 90% | 54,128 psi | 85% | 3064 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,406 psi | 90% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,739 psi | 89% | 3110 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 56,347 psi | 88% | 3025 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,114 psi | 86% | 3041 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,174 psi | 60% | 1932 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,550 psi | 87% | 3005 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,711 psi | 90% | 3091 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,694 psi | 86% | 3153 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,751 psi | 84% | 3104 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 90% | 57,188 psi | 90% | 3009 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 55,434 psi | 87% | 3022 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 57,377 psi | 90% | 2979 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,072 psi | 88% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,375 psi | 85% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,129 psi | 86% | 2897 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,013 psi | 86% | 3018 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 55,230 psi | 87% | 2946 fps | 98.6% |
| Somchem S365 | <<locked>> | 86% | 54,549 psi | 85% | 2966 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,724 psi | 87% | 2989 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,173 psi | 88% | 2887 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,535 psi | 87% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,521 psi | 87% | 2972 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 54,737 psi | 86% | 2959 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,711 psi | 90% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,740 psi | 90% | 3127 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 53,983 psi | 85% | 3045 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3104 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,911 psi | 86% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,058 psi | 89% | 3038 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,693 psi | 84% | 3100 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,579 psi | 87% | 2986 fps | 99.7% |
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% | 36,260 psi | 57% | 2612 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 48,385 psi | 76% | 2867 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 39,392 psi | 62% | 2782 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 84% | 42,728 psi | 67% | 2848 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 40,263 psi | 63% | 2743 fps | 97.1% |
| ADI AR 2213 | <<locked>> | 82% | 38,421 psi | 60% | 2730 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 90% | 37,144 psi | 58% | 2694 fps | 95% |
| ADI AR 2225 | <<locked>> | 88% | 31,444 psi | 49% | 2595 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,654 psi | 64% | 2743 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,253 psi | 72% | 2874 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,548 psi | 84% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,292 psi | 63% | 2736 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,172 psi | 57% | 2677 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,882 psi | 55% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,269 psi | 47% | 2549 fps | 97.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,421 psi | 60% | 2789 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 49,037 psi | 77% | 2887 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 36,042 psi | 56% | 2674 fps | 95.8% |
| Bofors RP30 | <<locked>> | 88% | 36,405 psi | 57% | 2717 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 36,172 psi | 57% | 2677 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 50,662 psi | 79% | 2871 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 35,563 psi | 56% | 2657 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 49,850 psi | 78% | 2920 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 52,373 psi | 82% | 2936 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 40,973 psi | 64% | 2736 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 40,248 psi | 63% | 2720 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,642 psi | 68% | 2749 fps | 100% |
| Hodgdon Retumbo | 64.8 gr | 84% | 33,663 psi | 53% | 2694 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 49,821 psi | 78% | 2949 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 44% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,079 psi | 72% | 2802 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,967 psi | 81% | 2894 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 45,905 psi | 72% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,030 psi | 63% | 2680 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 84% | 39,697 psi | 62% | 2772 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,883 psi | 58% | 2746 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,574 psi | 78% | 2841 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,834 psi | 75% | 2835 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 31,299 psi | 49% | 2487 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 46,195 psi | 72% | 2841 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 32,387 psi | 51% | 2651 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 37,942 psi | 59% | 2753 fps | 98% |
| Norma URP | <<locked>> | 80% | 47,166 psi | 74% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 36,593 psi | 57% | 2710 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 46,093 psi | 72% | 2851 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 32,663 psi | 51% | 2589 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,572 psi | 45% | 1729 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,443 psi | 76% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,485 psi | 73% | 2910 fps | 100% |
| ReloadSwiss RS 76 | 67.7 gr | 82% | 30,560 psi | 48% | 2595 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,728 psi | 67% | 2890 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 41,437 psi | 65% | 2720 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 80% | 39,595 psi | 62% | 2720 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 80% | 50,662 psi | 79% | 2871 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,574 psi | 78% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,834 psi | 75% | 2835 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,399 psi | 76% | 2785 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,262 psi | 62% | 2717 fps | 97% |
| Somchem S361 | <<locked>> | 80% | 42,250 psi | 66% | 2707 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 44,527 psi | 70% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,263 psi | 63% | 2707 fps | 98.1% |
| Vihtavuori N150 | <<locked>> | 80% | 52,518 psi | 82% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,689 psi | 76% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,882 psi | 55% | 2572 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,950 psi | 75% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,059 psi | 61% | 2717 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 40,799 psi | 64% | 2802 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 38,377 psi | 60% | 2733 fps | 95% |
| Vihtavuori N568 | <<locked>> | 94% | 44,034 psi | 69% | 2907 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,863 psi | 75% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,082 psi | 78% | 2923 fps | 99.8% |
| Winchester StaBALL HD | 63.4 gr | 80% | 31,053 psi | 49% | 2667 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,738 psi | 58% | 2625 fps | 96.1% |
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 73 powders for 7 x 66 SE v. Hofe loaded with the .284 | 155gr | Geco EXPRESS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,156 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 155.0 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, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 155gr | Geco EXPRESS 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.