Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Frontier BTSP bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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>> | 96% | 55,796 psi | 87% | 3107 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,363 psi | 90% | 3150 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,389 psi | 85% | 3202 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 55,114 psi | 86% | 3058 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,302 psi | 85% | 3143 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 55,825 psi | 87% | 3205 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,688 psi | 73% | 3022 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,452 psi | 65% | 2972 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,607 psi | 86% | 3140 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,318 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,476 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,622 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,508 psi | 90% | 3192 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,579 psi | 87% | 3202 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,550 psi | 89% | 3173 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3173 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,232 psi | 90% | 3271 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,563 psi | 86% | 3182 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 57,246 psi | 90% | 3097 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,196 psi | 76% | 3097 fps | 97.6% |
| Bofors RP5 | <<locked>> | 96% | 55,579 psi | 87% | 3202 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 56,347 psi | 88% | 3091 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 3120 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 82% | 57,377 psi | 90% | 3117 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,405 psi | 87% | 3146 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 54,621 psi | 86% | 3100 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 55,724 psi | 87% | 3140 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,752 psi | 86% | 3123 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,766 psi | 86% | 3068 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,126 psi | 80% | 3235 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 55,724 psi | 87% | 3182 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 58% | 1969 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,725 psi | 90% | 3130 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,273 psi | 85% | 3061 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 57,696 psi | 90% | 3140 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,884 psi | 89% | 3123 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 57,450 psi | 90% | 3248 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 54,911 psi | 86% | 3061 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,463 psi | 88% | 3110 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,113 psi | 83% | 3064 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,274 psi | 87% | 3133 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 37,043 psi | 58% | 2890 fps | 96.3% |
| Norma MRP | <<locked>> | 94% | 55,434 psi | 87% | 3225 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,753 psi | 87% | 3133 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,012 psi | 85% | 3196 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 88% | 54,650 psi | 86% | 3133 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3192 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 59% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,188 psi | 90% | 3104 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,969 psi | 86% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,435 psi | 90% | 3173 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,550 psi | 87% | 3202 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,924 psi | 81% | 3238 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 57,595 psi | 90% | 3097 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,680 psi | 87% | 3114 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 94% | 57,072 psi | 89% | 3179 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 86% | 56,347 psi | 88% | 3091 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,911 psi | 86% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,463 psi | 88% | 3110 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,463 psi | 87% | 3104 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,421 psi | 90% | 2959 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,696 psi | 90% | 3064 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,623 psi | 89% | 3176 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 57,203 psi | 90% | 3087 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,435 psi | 90% | 3100 fps | 98% |
| Somchem S365 | <<locked>> | 90% | 55,840 psi | 88% | 3130 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,609 psi | 90% | 3150 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 54,955 psi | 86% | 3005 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,624 psi | 90% | 3123 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,014 psi | 89% | 3123 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 56,666 psi | 89% | 3127 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,259 psi | 87% | 3146 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,361 psi | 87% | 3219 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 3192 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,174 psi | 90% | 3074 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,651 psi | 87% | 3153 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,737 psi | 84% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,766 psi | 84% | 3081 fps | 98.9% |
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% | 32,416 psi | 51% | 2631 fps | 96% |
| Accurate 4350 | <<locked>> | 80% | 43,642 psi | 68% | 2913 fps | 99.8% |
| Accurate MAGPRO | 72.1 gr | 90% | 47,152 psi | 74% | 3064 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 51,706 psi | 81% | 3002 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,914 psi | 61% | 2828 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 42,540 psi | 67% | 2940 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 98% | 43,627 psi | 68% | 2956 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 34,200 psi | 54% | 2779 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,334 psi | 62% | 2831 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,837 psi | 83% | 3028 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,771 psi | 65% | 2920 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,124 psi | 75% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,957 psi | 61% | 2825 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,624 psi | 62% | 2884 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,125 psi | 49% | 2664 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,908 psi | 48% | 2677 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,779 psi | 53% | 2799 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 39,305 psi | 62% | 2874 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 53,635 psi | 84% | 3041 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 42,076 psi | 66% | 2969 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 39,624 psi | 62% | 2884 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 46,717 psi | 73% | 2920 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 41,916 psi | 66% | 2920 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 53,795 psi | 84% | 3061 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,208 psi | 71% | 2959 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,877 psi | 75% | 2979 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 45,411 psi | 71% | 2949 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,599 psi | 70% | 2930 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,407 psi | 62% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,840 psi | 58% | 2894 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 44,614 psi | 70% | 2979 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1759 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,061 psi | 66% | 2841 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,863 psi | 75% | 2946 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 41,582 psi | 65% | 2854 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,208 psi | 69% | 2887 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 43,656 psi | 68% | 2979 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 45,614 psi | 71% | 2894 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 43,830 psi | 69% | 2877 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 31,691 psi | 50% | 2612 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 41,916 psi | 66% | 2874 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 34,650 psi | 54% | 2825 fps | 95.2% |
| Norma MRP | 62.9 gr | 80% | 33,721 psi | 53% | 2762 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 42,830 psi | 67% | 2900 fps | 99.7% |
| Ramshot Grand | <<locked>> | 90% | 43,613 psi | 68% | 2992 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 41,640 psi | 65% | 2887 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 36,187 psi | 57% | 2789 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 44% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,505 psi | 84% | 3045 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,068 psi | 80% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,540 psi | 68% | 2933 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,771 psi | 65% | 2946 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,620 psi | 53% | 2792 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 50,517 psi | 79% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,149 psi | 68% | 2874 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 38,159 psi | 60% | 2808 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 46,717 psi | 73% | 2920 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,614 psi | 71% | 2894 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 43,830 psi | 69% | 2877 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,808 psi | 81% | 3045 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,865 psi | 80% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,585 psi | 70% | 2835 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,826 psi | 59% | 2802 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 50,560 psi | 79% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,079 psi | 74% | 2920 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 39,624 psi | 62% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,274 psi | 57% | 2730 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 48,283 psi | 76% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,353 psi | 70% | 2897 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,882 psi | 56% | 2713 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 43,772 psi | 69% | 2897 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 34,824 psi | 55% | 2746 fps | 98.8% |
| Vihtavuori N560 | 69.2 gr | 88% | 44,947 psi | 70% | 3018 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 44,701 psi | 70% | 2995 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,468 psi | 68% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,411 psi | 71% | 2963 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,543 psi | 43% | 2657 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,942 psi | 59% | 2769 fps | 95.1% |
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 78 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Frontier BTSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,271 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:9.0 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Frontier BTSP 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.