Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Sierra Pro-Hunter bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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>> | 94% | 55,216 psi | 87% | 3100 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,463 psi | 88% | 3143 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,782 psi | 89% | 3264 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 53,766 psi | 84% | 3196 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,116 psi | 90% | 3097 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,174 psi | 90% | 3199 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 54,998 psi | 86% | 3202 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,429 psi | 77% | 3087 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,164 psi | 69% | 3045 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,377 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,636 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,710 psi | 89% | 3186 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,056 psi | 86% | 3196 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,159 psi | 88% | 3166 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 3232 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,956 psi | 89% | 3268 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,884 psi | 89% | 3156 fps | 96.2% |
| Bofors RP15 | <<locked>> | 98% | 57,711 psi | 90% | 3241 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 3163 fps | 98.4% |
| Bofors RP5 | <<locked>> | 94% | 55,056 psi | 86% | 3196 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 55,129 psi | 86% | 3084 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3182 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 54,302 psi | 85% | 3136 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,927 psi | 89% | 3150 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 54,984 psi | 86% | 3136 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,609 psi | 90% | 3179 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,479 psi | 90% | 3114 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,592 psi | 86% | 3304 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 54,766 psi | 86% | 3173 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 58% | 1988 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,753 psi | 89% | 3123 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,507 psi | 89% | 3110 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 56,710 psi | 89% | 3130 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,912 psi | 88% | 3120 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 56,652 psi | 89% | 3238 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 57,203 psi | 90% | 3107 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,506 psi | 87% | 3104 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 3120 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,114 psi | 85% | 3120 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 39,595 psi | 62% | 2956 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 54,984 psi | 86% | 3222 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 54,911 psi | 86% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,537 psi | 90% | 3261 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 57,305 psi | 90% | 3182 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,115 psi | 88% | 3192 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,826 psi | 59% | 2034 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,420 psi | 88% | 3163 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,723 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3304 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,256 psi | 79% | 3169 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 56,376 psi | 88% | 3084 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,694 psi | 86% | 3104 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 56,333 psi | 88% | 3176 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,129 psi | 86% | 3084 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,203 psi | 90% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,506 psi | 87% | 3104 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,144 psi | 88% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,463 psi | 88% | 3054 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,898 psi | 88% | 3173 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 55,999 psi | 88% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,492 psi | 89% | 3097 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 55,274 psi | 87% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,782 psi | 89% | 3146 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 57,377 psi | 90% | 3048 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,637 psi | 89% | 3114 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,405 psi | 88% | 3120 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,869 psi | 88% | 3120 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,868 psi | 86% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,752 psi | 86% | 3212 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 54,723 psi | 86% | 3192 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,387 psi | 81% | 3179 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,304 psi | 88% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,520 psi | 85% | 3140 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,099 psi | 85% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,855 psi | 89% | 3140 fps | 99.4% |
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% | 34,374 psi | 54% | 2687 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 46,064 psi | 72% | 2963 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 42,801 psi | 67% | 2989 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 88% | 46,775 psi | 73% | 3061 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,780 psi | 84% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,276 psi | 60% | 2818 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 41,858 psi | 66% | 2933 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 43,250 psi | 68% | 2956 fps | 96% |
| ADI AR 2225 | <<locked>> | 92% | 33,910 psi | 53% | 2776 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,932 psi | 69% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,778 psi | 80% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,406 psi | 60% | 2815 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,175 psi | 61% | 2874 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,924 psi | 52% | 2713 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,661 psi | 48% | 2671 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,056 psi | 56% | 2861 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,374 psi | 84% | 3091 fps | 95.3% |
| Bofors RP15 | <<locked>> | 86% | 38,986 psi | 61% | 2867 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 39,175 psi | 61% | 2904 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 39,175 psi | 61% | 2874 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 48,617 psi | 76% | 2966 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 90% | 38,566 psi | 60% | 2848 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 47,558 psi | 75% | 3015 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,995 psi | 78% | 3028 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 44,846 psi | 70% | 2943 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,888 psi | 69% | 2923 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,466 psi | 65% | 2844 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,521 psi | 57% | 2890 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 47,195 psi | 74% | 3035 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 44% | 1781 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,019 psi | 69% | 2890 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,937 psi | 78% | 2992 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 43,627 psi | 68% | 2900 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,569 psi | 68% | 2881 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 43,134 psi | 68% | 2976 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 47,543 psi | 75% | 2940 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,890 psi | 72% | 2927 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 31,488 psi | 49% | 2608 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 44,048 psi | 69% | 2930 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 34,621 psi | 54% | 2825 fps | 95.5% |
| Norma MRP | 65.9 gr | 80% | 35,737 psi | 56% | 2818 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 45,078 psi | 71% | 2949 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 40,074 psi | 63% | 2917 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,874 psi | 69% | 2940 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 35,810 psi | 56% | 2785 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 44% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,948 psi | 72% | 2982 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,135 psi | 69% | 2999 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,388 psi | 52% | 2792 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,557 psi | 73% | 3094 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 52,997 psi | 83% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,308 psi | 66% | 2861 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 37,666 psi | 59% | 2799 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 48,617 psi | 76% | 2966 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,543 psi | 75% | 2940 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,890 psi | 72% | 2927 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,779 psi | 83% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,543 psi | 73% | 2884 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,333 psi | 59% | 2792 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 52,707 psi | 83% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,294 psi | 68% | 2851 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,018 psi | 66% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,159 psi | 60% | 2782 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,517 psi | 79% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,543 psi | 73% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,360 psi | 55% | 2703 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 45,818 psi | 72% | 2943 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,854 psi | 58% | 2795 fps | 99.3% |
| Vihtavuori N560 | 70.8 gr | 86% | 44,324 psi | 69% | 3009 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 41,597 psi | 65% | 2930 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 47,950 psi | 75% | 3110 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,701 psi | 72% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,776 psi | 75% | 3015 fps | 99.2% |
| Winchester StaBALL HD | 65.2 gr | 80% | 29,225 psi | 46% | 2723 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,420 psi | 59% | 2762 fps | 95.2% |
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 80 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Sierra Pro-Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,304 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,304 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 140.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.