Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Sierra Tipped MatchKing 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 Winchester StaBALL HD.
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% | 54,389 psi | 85% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,492 psi | 87% | 2936 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,014 psi | 88% | 3064 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 56,898 psi | 89% | 3071 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 56,391 psi | 88% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 54,186 psi | 85% | 3005 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 2966 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,746 psi | 73% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,420 psi | 88% | 2989 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,522 psi | 90% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,782 psi | 87% | 2986 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,375 psi | 85% | 3002 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,709 psi | 87% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,027 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,173 psi | 88% | 3061 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,695 psi | 87% | 2966 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 57,232 psi | 90% | 3048 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 3041 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 54,375 psi | 85% | 3002 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 57,609 psi | 90% | 2936 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3054 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 57,159 psi | 90% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,941 psi | 88% | 2946 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 57,638 psi | 90% | 2999 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,608 psi | 89% | 2986 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,811 psi | 89% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,925 psi | 85% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 53,650 psi | 84% | 2969 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 58% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,782 psi | 87% | 2923 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,405 psi | 87% | 2904 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,854 psi | 88% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,027 psi | 86% | 2927 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 55,782 psi | 87% | 3041 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,148 psi | 66% | 2831 fps | 97.3% |
| Lovex S065 | <<locked>> | 84% | 56,260 psi | 88% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,331 psi | 85% | 2897 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,608 psi | 87% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,652 psi | 89% | 2982 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 42,395 psi | 66% | 2861 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 54,302 psi | 85% | 3025 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,464 psi | 90% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,811 psi | 89% | 3068 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 56,318 psi | 88% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,998 psi | 86% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,101 psi | 60% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,477 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,809 psi | 84% | 2986 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,781 psi | 86% | 3110 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3061 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 90% | 57,421 psi | 90% | 2969 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 55,376 psi | 87% | 2976 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 57,609 psi | 90% | 2936 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,260 psi | 88% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,331 psi | 85% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,347 psi | 87% | 2858 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,955 psi | 86% | 2972 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 55,129 psi | 86% | 2900 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 54,650 psi | 86% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,985 psi | 88% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 56,333 psi | 88% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,564 psi | 87% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,419 psi | 87% | 2927 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 54,810 psi | 86% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,331 psi | 85% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,696 psi | 90% | 3077 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 98% | 57,682 psi | 90% | 3058 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,592 psi | 86% | 3061 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,940 psi | 86% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,159 psi | 90% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,751 psi | 84% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,738 psi | 87% | 2943 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% | 36,347 psi | 57% | 2575 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 48,501 psi | 76% | 2825 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 39,421 psi | 62% | 2743 fps | 96.1% |
| Accurate MAGPRO | <<locked>> | 84% | 42,902 psi | 67% | 2812 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 40,364 psi | 63% | 2707 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 38,580 psi | 60% | 2697 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 37,304 psi | 58% | 2661 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 86% | 29,602 psi | 46% | 2503 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,499 psi | 73% | 2831 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,809 psi | 84% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,379 psi | 63% | 2697 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,303 psi | 57% | 2644 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,954 psi | 55% | 2602 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,371 psi | 48% | 2516 fps | 97.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,508 psi | 60% | 2753 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 49,139 psi | 77% | 2848 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 33,808 psi | 53% | 2579 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 36,405 psi | 57% | 2677 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 36,303 psi | 57% | 2644 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 50,705 psi | 79% | 2825 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 35,665 psi | 56% | 2625 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 50,053 psi | 78% | 2877 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 52,475 psi | 82% | 2890 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 41,162 psi | 65% | 2700 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 40,422 psi | 63% | 2684 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,859 psi | 69% | 2710 fps | 100% |
| Hodgdon Retumbo | 63.5 gr | 84% | 33,852 psi | 53% | 2664 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 49,980 psi | 78% | 2910 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 44% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,151 psi | 72% | 2759 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,054 psi | 82% | 2851 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 45,977 psi | 72% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,103 psi | 63% | 2641 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 82% | 37,173 psi | 58% | 2674 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,970 psi | 58% | 2710 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 49,632 psi | 78% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,080 psi | 75% | 2792 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 31,444 psi | 49% | 2454 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 46,383 psi | 73% | 2805 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 30,313 psi | 48% | 2552 fps | 95% |
| Norma MRP | <<locked>> | 80% | 37,985 psi | 60% | 2713 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 47,456 psi | 74% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 36,825 psi | 58% | 2680 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,282 psi | 73% | 2812 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 32,764 psi | 51% | 2556 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 45% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,501 psi | 76% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,557 psi | 73% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 66.3 gr | 82% | 30,676 psi | 48% | 2566 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 39,682 psi | 62% | 2785 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 41,684 psi | 65% | 2684 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,856 psi | 62% | 2687 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,705 psi | 79% | 2825 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,632 psi | 78% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,080 psi | 75% | 2792 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,689 psi | 76% | 2749 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,523 psi | 62% | 2684 fps | 97.4% |
| Somchem S361 | <<locked>> | 80% | 42,279 psi | 66% | 2667 fps | 96.1% |
| Somchem S365 | <<locked>> | 80% | 44,614 psi | 70% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,379 psi | 63% | 2667 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 80% | 52,794 psi | 83% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,791 psi | 76% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,954 psi | 55% | 2539 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 48,109 psi | 75% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,131 psi | 61% | 2677 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 40,886 psi | 64% | 2766 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 86% | 38,522 psi | 60% | 2697 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 94% | 44,150 psi | 69% | 2867 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,950 psi | 75% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,270 psi | 79% | 2884 fps | 99.9% |
| Winchester StaBALL HD | 62.1 gr | 80% | 31,270 psi | 49% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,898 psi | 58% | 2592 fps | 96.4% |
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 72 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Sierra Tipped MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,110 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 1:10.0 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, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Sierra Tipped MatchKing 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.