Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Nosler CT FailSafe bullet and 72 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% | 55,738 psi | 87% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,594 psi | 89% | 2953 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,217 psi | 90% | 3087 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 54,331 psi | 85% | 3028 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 57,580 psi | 90% | 3022 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 55,245 psi | 87% | 3028 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2992 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,790 psi | 75% | 2956 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,537 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,884 psi | 89% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,521 psi | 87% | 3022 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,927 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,420 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,696 psi | 90% | 3084 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,594 psi | 89% | 2989 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 54,708 psi | 86% | 3009 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3064 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 55,521 psi | 87% | 3022 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,781 psi | 86% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,926 psi | 86% | 3018 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,360 psi | 85% | 2953 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,927 psi | 89% | 2966 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,013 psi | 86% | 2963 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,682 psi | 90% | 3002 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,215 psi | 85% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,506 psi | 87% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,795 psi | 86% | 2989 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1860 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,652 psi | 89% | 2943 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,347 psi | 88% | 2923 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,855 psi | 89% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,014 psi | 88% | 2946 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 57,188 psi | 90% | 3068 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,308 psi | 68% | 2858 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 56,985 psi | 89% | 2917 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,288 psi | 87% | 2917 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,000 psi | 89% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,012 psi | 85% | 2943 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,656 psi | 68% | 2884 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 55,434 psi | 87% | 3041 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,911 psi | 86% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,085 psi | 85% | 3028 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,479 psi | 90% | 2999 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,594 psi | 89% | 3018 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1903 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,753 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,013 psi | 86% | 3005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,304 psi | 88% | 3133 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3091 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 54,708 psi | 86% | 2927 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 56,579 psi | 89% | 2999 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,781 psi | 86% | 2897 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,985 psi | 89% | 2917 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,288 psi | 87% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,246 psi | 88% | 2874 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,159 psi | 88% | 2992 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,260 psi | 88% | 2923 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 55,782 psi | 87% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,072 psi | 89% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,072 psi | 89% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,565 psi | 89% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,681 psi | 89% | 2949 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,753 psi | 87% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,608 psi | 87% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,129 psi | 86% | 3038 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,303 psi | 87% | 3025 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 3087 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,997 psi | 83% | 3081 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,999 psi | 88% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,607 psi | 86% | 2956 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,376 psi | 87% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,014 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% | 37,246 psi | 58% | 2595 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 49,588 psi | 78% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 40,364 psi | 63% | 2766 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 82% | 41,002 psi | 64% | 2769 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 41,075 psi | 64% | 2723 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 39,363 psi | 62% | 2717 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 38,145 psi | 60% | 2684 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 30,226 psi | 47% | 2526 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,427 psi | 74% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,249 psi | 65% | 2720 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,014 psi | 58% | 2664 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,766 psi | 56% | 2621 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,951 psi | 49% | 2536 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,682 psi | 62% | 2776 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,065 psi | 74% | 2812 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 34,534 psi | 54% | 2598 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 34,983 psi | 55% | 2641 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 37,014 psi | 58% | 2664 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 51,488 psi | 81% | 2844 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,361 psi | 57% | 2644 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 51,053 psi | 80% | 2897 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,243 psi | 83% | 2907 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 39,146 psi | 61% | 2657 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,263 psi | 65% | 2707 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,715 psi | 70% | 2730 fps | 100% |
| Hodgdon Retumbo | 63.1 gr | 82% | 32,285 psi | 51% | 2618 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,908 psi | 80% | 2927 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 44% | 1660 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,847 psi | 73% | 2776 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,779 psi | 83% | 2867 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,978 psi | 74% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,741 psi | 64% | 2657 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 38,000 psi | 60% | 2694 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,447 psi | 56% | 2674 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 50,401 psi | 79% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,849 psi | 77% | 2808 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,024 psi | 50% | 2470 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 47,311 psi | 74% | 2825 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 31,169 psi | 49% | 2579 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 38,914 psi | 61% | 2733 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 48,298 psi | 76% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,637 psi | 59% | 2703 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 47,239 psi | 74% | 2831 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,314 psi | 49% | 2516 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 45% | 1699 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,501 psi | 78% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,761 psi | 75% | 2890 fps | 100% |
| ReloadSwiss RS 76 | 67.6 gr | 82% | 31,444 psi | 49% | 2592 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,727 psi | 64% | 2812 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 42,395 psi | 66% | 2703 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 40,596 psi | 64% | 2707 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 51,488 psi | 81% | 2844 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,401 psi | 79% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,849 psi | 77% | 2808 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,385 psi | 77% | 2766 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,263 psi | 63% | 2700 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 43,207 psi | 68% | 2690 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 45,498 psi | 71% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,089 psi | 64% | 2687 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 53,621 psi | 84% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,806 psi | 78% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,781 psi | 56% | 2562 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 49,052 psi | 77% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,161 psi | 63% | 2700 fps | 100% |
| Vihtavuori N560 | 63.9 gr | 80% | 38,943 psi | 61% | 2723 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 39,523 psi | 62% | 2723 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 42,192 psi | 66% | 2828 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 49,327 psi | 77% | 3012 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,834 psi | 77% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,053 psi | 80% | 2897 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,314 psi | 51% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,710 psi | 59% | 2612 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 | Nosler CT FailSafe. 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 58–90 %, leaving at least 10 % headroom. The 160.0 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 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 | Nosler CT FailSafe 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.