Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Speer TBBC bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP 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>> | 94% | 54,897 psi | 86% | 3097 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,043 psi | 88% | 3133 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,246 psi | 90% | 3255 fps | 98% |
| ADI AR 2208 | <<locked>> | 82% | 56,985 psi | 89% | 3094 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,840 psi | 89% | 3192 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 54,708 psi | 86% | 3196 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,182 psi | 77% | 3081 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,729 psi | 69% | 3035 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,043 psi | 89% | 3189 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,956 psi | 89% | 3196 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,244 psi | 85% | 3150 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,333 psi | 88% | 3179 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,694 psi | 86% | 3192 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,811 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3225 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,362 psi | 88% | 3258 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,666 psi | 89% | 3150 fps | 96.1% |
| Bofors RP15 | <<locked>> | 98% | 57,421 psi | 90% | 3232 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,271 psi | 80% | 3156 fps | 98.3% |
| Bofors RP5 | <<locked>> | 94% | 54,694 psi | 86% | 3192 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 54,795 psi | 86% | 3074 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 3176 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 54,172 psi | 85% | 3133 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,811 psi | 89% | 3146 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 54,679 psi | 86% | 3130 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,290 psi | 90% | 3173 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,334 psi | 90% | 3110 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,056 psi | 85% | 3297 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 54,447 psi | 85% | 3166 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 58% | 1988 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,463 psi | 88% | 3120 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,362 psi | 88% | 3104 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 56,318 psi | 88% | 3123 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,622 psi | 87% | 3114 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 56,318 psi | 88% | 3232 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 56,826 psi | 89% | 3100 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,187 psi | 86% | 3097 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 3110 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,537 psi | 90% | 3179 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,305 psi | 62% | 2949 fps | 97.4% |
| Norma MRP | <<locked>> | 92% | 54,607 psi | 86% | 3215 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 54,563 psi | 86% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,246 psi | 90% | 3258 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 56,956 psi | 89% | 3179 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,535 psi | 87% | 3182 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,898 psi | 59% | 2034 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,711 psi | 90% | 3192 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,057 psi | 88% | 3156 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,375 psi | 85% | 3186 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,056 psi | 86% | 3297 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,995 psi | 78% | 3166 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,246 psi | 88% | 3081 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,607 psi | 86% | 3100 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 92% | 55,985 psi | 88% | 3169 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 54,795 psi | 86% | 3074 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,826 psi | 89% | 3100 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,187 psi | 86% | 3097 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,740 psi | 90% | 3143 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,014 psi | 88% | 2946 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,318 psi | 88% | 3054 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,550 psi | 87% | 3163 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 55,869 psi | 88% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,188 psi | 88% | 3091 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 54,853 psi | 86% | 3120 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,478 psi | 89% | 3140 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 57,000 psi | 89% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,260 psi | 88% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,130 psi | 88% | 3117 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,564 psi | 87% | 3114 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,491 psi | 85% | 3140 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,447 psi | 85% | 3209 fps | 98% |
| Vihtavuori N565 | <<locked>> | 98% | 54,230 psi | 85% | 3179 fps | 98.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,908 psi | 80% | 3169 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,999 psi | 88% | 3061 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,172 psi | 85% | 3133 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,638 psi | 90% | 3307 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,521 psi | 89% | 3133 fps | 99.3% |
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% | 34,055 psi | 53% | 2677 fps | 96.8% |
| Accurate 4350 | <<locked>> | 80% | 45,643 psi | 72% | 2956 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 46,253 psi | 72% | 3048 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 53,606 psi | 84% | 3038 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,130 psi | 60% | 2815 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 86% | 41,553 psi | 65% | 2923 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 42,801 psi | 67% | 2943 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 33,692 psi | 53% | 2769 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,421 psi | 60% | 2815 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,714 psi | 69% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,589 psi | 79% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,072 psi | 60% | 2808 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,044 psi | 61% | 2871 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,605 psi | 51% | 2707 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,385 psi | 48% | 2664 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,708 psi | 56% | 2851 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,171 psi | 83% | 3087 fps | 95.2% |
| Bofors RP15 | <<locked>> | 86% | 38,682 psi | 61% | 2861 fps | 95.6% |
| Bofors RP30 | <<locked>> | 94% | 41,684 psi | 65% | 2959 fps | 96% |
| Bofors RP5 | <<locked>> | 84% | 39,044 psi | 61% | 2871 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 48,269 psi | 76% | 2959 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 41,046 psi | 64% | 2907 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,224 psi | 74% | 3005 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 49,879 psi | 78% | 3025 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 44,527 psi | 70% | 2936 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,569 psi | 68% | 2913 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,307 psi | 65% | 2838 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,245 psi | 57% | 2884 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 46,862 psi | 73% | 3028 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 44% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,859 psi | 69% | 2884 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,792 psi | 78% | 2989 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 43,439 psi | 68% | 2897 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,294 psi | 68% | 2874 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 88% | 42,830 psi | 67% | 2969 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 47,210 psi | 74% | 2933 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,571 psi | 71% | 2920 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 31,343 psi | 49% | 2602 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 43,918 psi | 69% | 2923 fps | 97% |
| Norma 217 | <<locked>> | 96% | 34,360 psi | 54% | 2818 fps | 95.3% |
| Norma MRP | 65.5 gr | 80% | 35,447 psi | 56% | 2812 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 44,744 psi | 70% | 2943 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 42,699 psi | 67% | 2976 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 43,729 psi | 69% | 2936 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 35,549 psi | 56% | 2776 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,384 psi | 44% | 1821 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,780 psi | 84% | 3136 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,585 psi | 71% | 2976 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,830 psi | 69% | 2992 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,170 psi | 52% | 2782 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,282 psi | 73% | 3091 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 52,562 psi | 82% | 3025 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,163 psi | 66% | 2858 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 37,362 psi | 59% | 2792 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 48,269 psi | 76% | 2959 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,210 psi | 74% | 2933 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,571 psi | 71% | 2920 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,143 psi | 85% | 3087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,605 psi | 82% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,224 psi | 72% | 2874 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,028 psi | 58% | 2785 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 52,315 psi | 82% | 3018 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,847 psi | 72% | 2904 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 41,814 psi | 66% | 2897 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,043 psi | 60% | 2779 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,154 psi | 79% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,195 psi | 72% | 2936 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 35,215 psi | 55% | 2700 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 45,658 psi | 72% | 2940 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,709 psi | 58% | 2792 fps | 99.3% |
| Vihtavuori N560 | 70.4 gr | 86% | 44,005 psi | 69% | 3002 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 92% | 44,193 psi | 69% | 2986 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 47,471 psi | 74% | 3100 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,368 psi | 71% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,442 psi | 74% | 3009 fps | 99.1% |
| Winchester StaBALL HD | 64.9 gr | 80% | 29,109 psi | 46% | 2720 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,101 psi | 58% | 2753 fps | 95% |
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 77 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Speer TBBC. Winchester StaBALL HD delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,307 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:12.0 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, Norma MRP, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Speer TBBC 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.