Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Speer Magnum Tip Soft Point bullet and 71 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 Accurate MAGPRO.
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% | 56,826 psi | 89% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,027 psi | 85% | 2920 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,737 psi | 86% | 3051 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 90% | 55,637 psi | 87% | 3054 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 54,824 psi | 86% | 2982 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,565 psi | 89% | 3051 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3015 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,066 psi | 77% | 2979 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,172 psi | 86% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,476 psi | 85% | 2972 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,797 psi | 89% | 3048 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,737 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,099 psi | 85% | 3022 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,853 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 3035 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,682 psi | 90% | 3012 fps | 97.8% |
| Bofors RP15 | <<locked>> | 94% | 55,970 psi | 88% | 3035 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 53,925 psi | 85% | 3028 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,797 psi | 89% | 3048 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,709 psi | 87% | 2917 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,347 psi | 88% | 3045 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,564 psi | 87% | 2976 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,231 psi | 88% | 2986 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,042 psi | 86% | 2966 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,230 psi | 87% | 2894 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,782 psi | 89% | 3163 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,115 psi | 88% | 3015 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 59% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,143 psi | 85% | 2907 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,014 psi | 89% | 2936 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,331 psi | 85% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,971 psi | 89% | 2966 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 54,534 psi | 85% | 3031 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,657 psi | 70% | 2884 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 54,520 psi | 85% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,420 psi | 88% | 2940 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,694 psi | 86% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,100 psi | 86% | 2966 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 45,049 psi | 71% | 2910 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 56,782 psi | 89% | 3064 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,130 psi | 88% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,463 psi | 87% | 3051 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 54,882 psi | 86% | 2963 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 53,751 psi | 84% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 60% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,186 psi | 85% | 2943 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,246 psi | 88% | 3025 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,711 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3117 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 55,738 psi | 87% | 2949 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 57,682 psi | 90% | 3018 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 55,709 psi | 87% | 2917 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,520 psi | 85% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,420 psi | 88% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,087 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,261 psi | 90% | 3015 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,348 psi | 90% | 2946 fps | 99.2% |
| Somchem S365 | <<locked>> | 86% | 57,058 psi | 89% | 2959 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,433 psi | 85% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,740 psi | 90% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,186 psi | 85% | 2917 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,855 psi | 89% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,811 psi | 89% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,434 psi | 88% | 3064 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 96% | 56,739 psi | 89% | 3051 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 53,621 psi | 84% | 3048 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 3110 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,246 psi | 90% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,796 psi | 87% | 2979 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,319 psi | 90% | 3100 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,389 psi | 85% | 2930 fps | 99.8% |
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% | 38,116 psi | 60% | 2618 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 50,618 psi | 79% | 2864 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,408 psi | 65% | 2792 fps | 96.9% |
| Accurate MAGPRO | 68 gr | 82% | 41,800 psi | 66% | 2792 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,959 psi | 66% | 2746 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 37,478 psi | 59% | 2674 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 36,376 psi | 57% | 2644 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 28,950 psi | 45% | 2487 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,269 psi | 76% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,119 psi | 66% | 2743 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,884 psi | 59% | 2684 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,680 psi | 57% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,691 psi | 50% | 2559 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,640 psi | 64% | 2795 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,718 psi | 75% | 2963 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,776 psi | 75% | 2831 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 35,360 psi | 55% | 2621 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 35,781 psi | 56% | 2661 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 37,884 psi | 59% | 2684 fps | 97% |
| Bofors RP7 | <<locked>> | 80% | 52,402 psi | 82% | 2864 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,708 psi | 54% | 2605 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 52,011 psi | 82% | 2917 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,958 psi | 63% | 2680 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,276 psi | 62% | 2664 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,527 psi | 71% | 2743 fps | 100% |
| Hodgdon Retumbo | 64.4 gr | 82% | 33,170 psi | 52% | 2648 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 51,996 psi | 81% | 2949 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 44% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,747 psi | 75% | 2799 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,693 psi | 84% | 2887 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,732 psi | 75% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,524 psi | 65% | 2680 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 38,798 psi | 61% | 2720 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,448 psi | 57% | 2700 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 51,300 psi | 80% | 2835 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,748 psi | 78% | 2831 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,851 psi | 51% | 2493 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 48,167 psi | 75% | 2844 fps | 99% |
| Norma 217 | <<locked>> | 88% | 29,994 psi | 47% | 2543 fps | 95% |
| Norma MRP | <<locked>> | 80% | 39,987 psi | 63% | 2759 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 49,269 psi | 77% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,795 psi | 56% | 2657 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 48,124 psi | 75% | 2848 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,010 psi | 50% | 2536 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 45% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,473 psi | 79% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,718 psi | 76% | 2907 fps | 100% |
| ReloadSwiss RS 76 | 67.2 gr | 80% | 29,979 psi | 47% | 2549 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,974 psi | 66% | 2841 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 43,236 psi | 68% | 2723 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,510 psi | 65% | 2726 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 52,402 psi | 82% | 2864 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,300 psi | 80% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,748 psi | 78% | 2831 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,241 psi | 79% | 2785 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,162 psi | 65% | 2723 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 43,918 psi | 69% | 2710 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 46,572 psi | 73% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,945 psi | 66% | 2707 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 50,763 psi | 80% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,579 psi | 57% | 2582 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 49,951 psi | 78% | 2841 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,973 psi | 64% | 2717 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,972 psi | 63% | 2749 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 37,811 psi | 59% | 2684 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 92% | 43,265 psi | 68% | 2854 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 98% | 50,749 psi | 80% | 3038 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,821 psi | 78% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,011 psi | 82% | 2917 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,388 psi | 52% | 2680 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,493 psi | 60% | 2635 fps | 97.1% |
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 71 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Speer Magnum Tip Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,163 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 160.0 gr projectile in 0.284" calls for a 1:12.5 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, Accurate MAGPRO rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Speer Magnum Tip Soft Point 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.