Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | North Fork FPS 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, 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% | 55,825 psi | 87% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,681 psi | 89% | 2956 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,537 psi | 90% | 3094 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 54,418 psi | 85% | 3031 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 57,609 psi | 90% | 3022 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 55,564 psi | 87% | 3035 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2995 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2956 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,186 psi | 85% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,927 psi | 89% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,811 psi | 87% | 3028 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,246 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,710 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 53,751 psi | 84% | 3025 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 50,038 psi | 78% | 3005 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,608 psi | 89% | 2989 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 54,766 psi | 86% | 3009 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3064 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 55,811 psi | 87% | 3028 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,882 psi | 86% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,984 psi | 86% | 3018 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,665 psi | 86% | 2959 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,985 psi | 89% | 2969 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,288 psi | 87% | 2969 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,114 psi | 85% | 2949 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,273 psi | 85% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,535 psi | 87% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,114 psi | 86% | 2995 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1860 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,739 psi | 89% | 2943 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,405 psi | 88% | 2923 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,174 psi | 90% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,057 psi | 88% | 2949 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 57,217 psi | 90% | 3068 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,555 psi | 68% | 2861 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 57,072 psi | 89% | 2920 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,361 psi | 87% | 2920 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,043 psi | 89% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,056 psi | 85% | 2943 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,918 psi | 69% | 2890 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 55,738 psi | 87% | 3048 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,984 psi | 86% | 2936 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,128 psi | 85% | 3028 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,537 psi | 90% | 2999 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,623 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,305 psi | 60% | 1906 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,797 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,114 psi | 86% | 3005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,318 psi | 88% | 3136 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3091 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 54,984 psi | 86% | 2933 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 56,623 psi | 89% | 2999 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,882 psi | 86% | 2897 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,072 psi | 89% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,361 psi | 87% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,275 psi | 88% | 2874 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,188 psi | 88% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,289 psi | 88% | 2923 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 55,840 psi | 88% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,130 psi | 90% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,130 psi | 90% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,623 psi | 89% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,768 psi | 89% | 2949 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,825 psi | 87% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,680 psi | 87% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,434 psi | 87% | 3045 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,608 psi | 87% | 3028 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3094 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,330 psi | 84% | 3084 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,057 psi | 88% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,665 psi | 86% | 2959 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,738 psi | 87% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,043 psi | 89% | 2966 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% | 37,304 psi | 58% | 2598 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 49,647 psi | 78% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 40,422 psi | 63% | 2769 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 41,046 psi | 64% | 2772 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 41,133 psi | 64% | 2726 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 39,436 psi | 62% | 2717 fps | 96% |
| ADI AR 2217 | <<locked>> | 90% | 38,189 psi | 60% | 2687 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 30,255 psi | 47% | 2526 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,500 psi | 74% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,321 psi | 65% | 2723 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,072 psi | 58% | 2664 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,824 psi | 56% | 2621 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,038 psi | 49% | 2539 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,740 psi | 62% | 2776 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 46,615 psi | 73% | 2940 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,108 psi | 74% | 2815 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 34,592 psi | 54% | 2602 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 35,027 psi | 55% | 2641 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 37,072 psi | 58% | 2664 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 51,547 psi | 81% | 2844 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,390 psi | 57% | 2644 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 51,111 psi | 80% | 2900 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,316 psi | 84% | 2910 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 39,218 psi | 61% | 2661 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,537 psi | 60% | 2644 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,788 psi | 70% | 2730 fps | 100% |
| Hodgdon Retumbo | 63.3 gr | 82% | 32,489 psi | 51% | 2625 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 50,952 psi | 80% | 2927 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 44% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,949 psi | 74% | 2779 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,837 psi | 83% | 2867 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,036 psi | 74% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,799 psi | 64% | 2661 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 38,043 psi | 60% | 2697 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,650 psi | 56% | 2680 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 50,459 psi | 79% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,921 psi | 77% | 2812 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,082 psi | 50% | 2470 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 47,369 psi | 74% | 2825 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 31,212 psi | 49% | 2582 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 38,957 psi | 61% | 2736 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 48,356 psi | 76% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,695 psi | 59% | 2703 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 47,297 psi | 74% | 2835 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,343 psi | 49% | 2516 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 45% | 1703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,559 psi | 78% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,819 psi | 75% | 2890 fps | 100% |
| ReloadSwiss RS 76 | 67.7 gr | 82% | 31,502 psi | 49% | 2595 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,959 psi | 64% | 2818 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 42,453 psi | 67% | 2703 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 40,654 psi | 64% | 2707 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 51,547 psi | 81% | 2844 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,459 psi | 79% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,921 psi | 77% | 2812 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,443 psi | 77% | 2766 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,364 psi | 63% | 2703 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 43,265 psi | 68% | 2694 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 45,600 psi | 71% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,147 psi | 64% | 2687 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 53,693 psi | 84% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,864 psi | 78% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,839 psi | 56% | 2562 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 49,110 psi | 77% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,234 psi | 63% | 2700 fps | 100% |
| Vihtavuori N560 | 64 gr | 80% | 39,001 psi | 61% | 2723 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 39,581 psi | 62% | 2723 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 42,264 psi | 66% | 2828 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 49,647 psi | 78% | 3018 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,878 psi | 77% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,111 psi | 80% | 2900 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,387 psi | 51% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,753 psi | 59% | 2615 fps | 96.8% |
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 79 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | North Fork FPS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,140 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 1:11.5 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, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | North Fork FPS 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.