Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Norma FMJ SemiP bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Hodgdon Retumbo 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% | 54,128 psi | 85% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,347 psi | 87% | 3028 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,608 psi | 87% | 3153 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 56,681 psi | 89% | 3156 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 56,101 psi | 88% | 3091 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 57,696 psi | 90% | 3156 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,996 psi | 81% | 3054 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,412 psi | 73% | 3012 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,347 psi | 88% | 3087 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,246 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,435 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,666 psi | 87% | 3077 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,056 psi | 85% | 3087 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,463 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,795 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,999 psi | 88% | 3153 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,463 psi | 87% | 3048 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 56,985 psi | 89% | 3136 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,592 psi | 86% | 3127 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 54,056 psi | 85% | 3087 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,363 psi | 90% | 3028 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3146 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 56,884 psi | 89% | 3084 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,637 psi | 87% | 3038 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 57,493 psi | 90% | 3091 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,289 psi | 88% | 3071 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,579 psi | 89% | 3005 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,479 psi | 90% | 3264 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,464 psi | 90% | 3123 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,535 psi | 87% | 3015 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,056 psi | 86% | 2992 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,608 psi | 87% | 3018 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,723 psi | 86% | 3012 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,579 psi | 87% | 3133 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,974 psi | 66% | 2907 fps | 96.8% |
| Lovex S065 | <<locked>> | 84% | 55,825 psi | 87% | 2992 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,638 psi | 90% | 3045 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,550 psi | 87% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,463 psi | 88% | 3071 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 42,192 psi | 66% | 2936 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 53,838 psi | 84% | 3110 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,232 psi | 90% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,550 psi | 89% | 3156 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 56,057 psi | 88% | 3071 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,027 psi | 86% | 3087 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 60% | 1969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,288 psi | 87% | 3051 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,537 psi | 90% | 3136 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,534 psi | 85% | 3196 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3146 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 90% | 57,174 psi | 90% | 3058 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 55,114 psi | 86% | 3064 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 57,363 psi | 90% | 3028 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,825 psi | 87% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,638 psi | 90% | 3045 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,027 psi | 86% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,694 psi | 86% | 3058 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 54,998 psi | 86% | 2989 fps | 98.4% |
| Somchem S365 | <<locked>> | 86% | 54,360 psi | 85% | 3012 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,579 psi | 87% | 3035 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,927 psi | 88% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,390 psi | 87% | 3002 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,259 psi | 87% | 3015 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 54,592 psi | 86% | 3005 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,580 psi | 90% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,595 psi | 90% | 3169 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 57,522 psi | 90% | 3150 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3150 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,810 psi | 86% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,072 psi | 89% | 3087 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,667 psi | 90% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,550 psi | 87% | 3031 fps | 99.6% |
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% | 36,114 psi | 57% | 2648 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 48,153 psi | 75% | 2913 fps | 100% |
| Accurate High Country | 65.5 gr | 80% | 39,262 psi | 62% | 2822 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 84% | 42,612 psi | 67% | 2887 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 40,118 psi | 63% | 2782 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 41,075 psi | 64% | 2835 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 39,726 psi | 62% | 2799 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 31,386 psi | 49% | 2631 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,466 psi | 63% | 2782 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,093 psi | 72% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,417 psi | 84% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,103 psi | 63% | 2776 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,998 psi | 56% | 2717 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,751 psi | 54% | 2677 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,168 psi | 47% | 2585 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,203 psi | 60% | 2828 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 48,979 psi | 77% | 2930 fps | 95% |
| Bofors RP15 | <<locked>> | 82% | 35,868 psi | 56% | 2710 fps | 95.4% |
| Bofors RP30 | <<locked>> | 90% | 38,841 psi | 61% | 2812 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 35,998 psi | 56% | 2717 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 50,531 psi | 79% | 2913 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 37,898 psi | 59% | 2759 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 49,806 psi | 78% | 2966 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 52,112 psi | 82% | 2979 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 40,886 psi | 64% | 2776 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,033 psi | 67% | 2825 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,511 psi | 68% | 2795 fps | 100% |
| Hodgdon Retumbo | 66.2 gr | 84% | 33,562 psi | 53% | 2730 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 49,719 psi | 78% | 2995 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,905 psi | 72% | 2844 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,851 psi | 81% | 2940 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 45,716 psi | 72% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,885 psi | 63% | 2720 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 39,581 psi | 62% | 2812 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,291 psi | 62% | 2844 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 49,458 psi | 78% | 2887 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,863 psi | 75% | 2881 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 31,096 psi | 49% | 2520 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 46,137 psi | 72% | 2887 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 32,271 psi | 51% | 2684 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 37,855 psi | 59% | 2789 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 47,224 psi | 74% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,305 psi | 62% | 2818 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 46,021 psi | 72% | 2894 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 32,663 psi | 51% | 2625 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,153 psi | 75% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,325 psi | 73% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,779 psi | 51% | 2703 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,670 psi | 67% | 2933 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 41,495 psi | 65% | 2762 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 39,610 psi | 62% | 2766 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 50,531 psi | 79% | 2913 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,458 psi | 78% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,863 psi | 75% | 2881 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,428 psi | 76% | 2835 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,276 psi | 62% | 2759 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 42,119 psi | 66% | 2746 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,309 psi | 69% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,089 psi | 63% | 2743 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,576 psi | 82% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,472 psi | 76% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,722 psi | 54% | 2612 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 47,921 psi | 75% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,928 psi | 61% | 2759 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 40,654 psi | 64% | 2841 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 41,002 psi | 64% | 2835 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 43,888 psi | 69% | 2946 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,688 psi | 75% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,806 psi | 78% | 2966 fps | 99.7% |
| Winchester StaBALL HD | 64.8 gr | 80% | 30,980 psi | 49% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,709 psi | 58% | 2667 fps | 95.8% |
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 73 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | Norma FMJ SemiP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,264 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,264 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 150.0 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 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. Accurate High Country, Hodgdon Retumbo, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Norma FMJ SemiP 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.