Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Woodleigh PP SN 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 Vihtavuori N560.
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% | 56,217 psi | 88% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,159 psi | 90% | 2963 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,709 psi | 87% | 3048 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 88% | 54,418 psi | 85% | 2972 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,912 psi | 88% | 3041 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3005 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,385 psi | 76% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,447 psi | 85% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,580 psi | 90% | 3018 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,202 psi | 88% | 3035 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,667 psi | 90% | 2999 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,159 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,201 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 3022 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,058 psi | 89% | 2995 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 55,376 psi | 87% | 3022 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3074 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 56,202 psi | 88% | 3035 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,303 psi | 87% | 2907 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 3031 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,014 psi | 88% | 2956 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 94% | 55,158 psi | 86% | 2966 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,462 psi | 85% | 2956 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,766 psi | 86% | 2887 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,202 psi | 88% | 3153 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,506 psi | 87% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,275 psi | 58% | 1860 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,159 psi | 90% | 2953 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,608 psi | 89% | 2930 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 55,245 psi | 87% | 2920 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,405 psi | 88% | 2956 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 90% | 54,172 psi | 85% | 3022 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,903 psi | 69% | 2871 fps | 97.9% |
| Lovex S065 | <<locked>> | 84% | 57,493 psi | 90% | 2927 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,782 psi | 87% | 2927 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,464 psi | 90% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,476 psi | 85% | 2953 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,295 psi | 69% | 2897 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 56,173 psi | 88% | 3054 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,405 psi | 87% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,824 psi | 84% | 3025 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 54,244 psi | 85% | 2953 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,216 psi | 87% | 2999 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,145 psi | 60% | 1906 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,232 psi | 90% | 2989 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,811 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,913 psi | 89% | 3146 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3104 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 55,376 psi | 87% | 2943 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 57,029 psi | 89% | 3009 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,303 psi | 87% | 2907 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,493 psi | 90% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,782 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,724 psi | 89% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,594 psi | 89% | 3002 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,855 psi | 89% | 2936 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 56,333 psi | 88% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,493 psi | 90% | 2976 fps | 100% |
| Unknown powder | <<locked>> | 82% | 55,550 psi | 87% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,609 psi | 90% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,087 psi | 89% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,348 psi | 90% | 2963 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,260 psi | 88% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,130 psi | 88% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,840 psi | 88% | 3054 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 55,956 psi | 88% | 3035 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3104 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 3094 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,666 psi | 89% | 2890 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,289 psi | 88% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,969 psi | 86% | 2936 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% | 37,550 psi | 59% | 2605 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 49,922 psi | 78% | 2851 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,223 psi | 71% | 2854 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 41,553 psi | 65% | 2736 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 37,115 psi | 58% | 2664 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 88% | 36,056 psi | 56% | 2635 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 30,516 psi | 48% | 2536 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,761 psi | 75% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,524 psi | 65% | 2730 fps | 97.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,478 psi | 59% | 2674 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,230 psi | 57% | 2631 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,343 psi | 49% | 2549 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,176 psi | 63% | 2785 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,079 psi | 74% | 2949 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,384 psi | 74% | 2822 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 34,954 psi | 55% | 2612 fps | 95.8% |
| Bofors RP30 | <<locked>> | 86% | 35,389 psi | 55% | 2654 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 37,478 psi | 59% | 2674 fps | 96.8% |
| Bofors RP7 | <<locked>> | 80% | 51,982 psi | 81% | 2854 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 86% | 34,708 psi | 54% | 2602 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,472 psi | 78% | 2844 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 84% | 39,943 psi | 63% | 2677 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,914 psi | 61% | 2654 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,049 psi | 71% | 2736 fps | 100% |
| Hodgdon Retumbo | 63.7 gr | 82% | 32,677 psi | 51% | 2631 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 51,605 psi | 81% | 2940 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,949 psi | 44% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,326 psi | 74% | 2789 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,272 psi | 83% | 2877 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 43,047 psi | 67% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,133 psi | 64% | 2671 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 80% | 38,087 psi | 60% | 2697 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,969 psi | 56% | 2687 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,865 psi | 80% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,327 psi | 77% | 2822 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,445 psi | 51% | 2480 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 47,790 psi | 75% | 2835 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 31,517 psi | 49% | 2592 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 39,392 psi | 62% | 2746 fps | 98.6% |
| Norma URP | <<locked>> | 80% | 48,820 psi | 77% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,639 psi | 62% | 2749 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 80% | 47,688 psi | 75% | 2841 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,621 psi | 54% | 2605 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,616 psi | 45% | 1703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,024 psi | 78% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,269 psi | 76% | 2897 fps | 100% |
| ReloadSwiss RS 76 | 66.5 gr | 80% | 29,573 psi | 46% | 2533 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,278 psi | 65% | 2825 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,844 psi | 67% | 2713 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 41,089 psi | 64% | 2720 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 80% | 51,982 psi | 81% | 2854 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,865 psi | 80% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,327 psi | 77% | 2822 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,864 psi | 78% | 2776 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,756 psi | 64% | 2713 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 43,584 psi | 68% | 2700 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 46,050 psi | 72% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,524 psi | 65% | 2697 fps | 98.6% |
| Unknown powder | <<locked>> | 80% | 51,924 psi | 81% | 2890 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 54,114 psi | 85% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,096 psi | 79% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,042 psi | 56% | 2569 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 80% | 49,559 psi | 78% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,509 psi | 63% | 2710 fps | 100% |
| Vihtavuori N560 | 64.5 gr | 80% | 39,407 psi | 62% | 2733 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 84% | 37,304 psi | 58% | 2671 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 92% | 42,757 psi | 67% | 2841 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 49,966 psi | 78% | 3025 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,255 psi | 77% | 2782 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,866 psi | 52% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,437 psi | 65% | 2694 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 77 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,153 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 160.0 gr projectile in 0.284" calls for a 1:12.0 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, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.