Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Barnes X S 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, Alliant Reloder-26 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>> | 92% | 54,172 psi | 85% | 3064 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,245 psi | 87% | 3100 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,752 psi | 86% | 3212 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 92% | 55,622 psi | 87% | 3212 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 90% | 54,911 psi | 86% | 3143 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 56,333 psi | 88% | 3205 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,952 psi | 80% | 3097 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,021 psi | 72% | 3064 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,376 psi | 87% | 3143 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,376 psi | 87% | 3143 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,071 psi | 86% | 3150 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,202 psi | 88% | 3163 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,737 psi | 86% | 3133 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,681 psi | 89% | 3209 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,491 psi | 85% | 3130 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,810 psi | 86% | 3219 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,840 psi | 88% | 3189 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 3186 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 56,681 psi | 89% | 3209 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 56,869 psi | 89% | 3091 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,985 psi | 88% | 3189 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 56,101 psi | 88% | 3146 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 54,839 psi | 86% | 3094 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 56,478 psi | 89% | 3140 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,376 psi | 87% | 3123 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,767 psi | 87% | 3071 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3317 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,347 psi | 88% | 3179 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1975 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,824 psi | 86% | 3074 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,505 psi | 85% | 3054 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 55,201 psi | 87% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,188 psi | 90% | 3120 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 54,462 psi | 85% | 3182 fps | 98.3% |
| Lovex S065 | <<locked>> | 84% | 55,738 psi | 87% | 3061 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,334 psi | 90% | 3110 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,245 psi | 87% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,680 psi | 87% | 3130 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 41,959 psi | 66% | 2999 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 56,695 psi | 89% | 3235 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,565 psi | 89% | 3130 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,143 psi | 86% | 3205 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 55,434 psi | 87% | 3136 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,653 psi | 90% | 3202 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 60% | 2021 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,882 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,217 psi | 88% | 3199 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3317 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,388 psi | 82% | 3196 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 90% | 56,217 psi | 88% | 3110 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 90% | 54,491 psi | 85% | 3127 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 84% | 56,869 psi | 89% | 3091 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,738 psi | 87% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,334 psi | 90% | 3110 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,566 psi | 90% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,795 psi | 86% | 3009 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,522 psi | 90% | 3179 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 54,534 psi | 85% | 3045 fps | 97.6% |
| Somchem S365 | <<locked>> | 88% | 57,159 psi | 90% | 3136 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,100 psi | 86% | 3097 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 55,666 psi | 87% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,781 psi | 86% | 3064 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,563 psi | 86% | 3074 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 57,711 psi | 90% | 3130 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,072 psi | 89% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,304 psi | 88% | 3222 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 98% | 56,811 psi | 89% | 3205 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,200 psi | 83% | 3196 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,493 psi | 90% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,101 psi | 88% | 3146 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,767 psi | 87% | 3271 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,636 psi | 86% | 3087 fps | 99% |
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% | 37,115 psi | 58% | 2730 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 48,530 psi | 76% | 2989 fps | 100% |
| Accurate High Country | 65.6 gr | 82% | 42,032 psi | 66% | 2953 fps | 95.4% |
| Accurate MAGPRO | 70.1 gr | 86% | 45,498 psi | 71% | 3015 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 40,045 psi | 63% | 2841 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 86% | 43,540 psi | 68% | 2953 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 42,221 psi | 66% | 2910 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 33,997 psi | 53% | 2756 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,495 psi | 63% | 2844 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,495 psi | 63% | 2844 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,556 psi | 71% | 2982 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,533 psi | 82% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,147 psi | 63% | 2838 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,638 psi | 61% | 2844 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,099 psi | 55% | 2753 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,864 psi | 48% | 2657 fps | 96.1% |
| Alliant Reloder-26 | 65.9 gr | 80% | 38,363 psi | 60% | 2900 fps | 99.2% |
| Bofors RP15 | <<locked>> | 84% | 38,479 psi | 60% | 2838 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 41,336 psi | 65% | 2936 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 38,638 psi | 61% | 2844 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 50,444 psi | 79% | 2979 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 40,553 psi | 64% | 2874 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 49,342 psi | 77% | 3028 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 51,648 psi | 81% | 3038 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,499 psi | 73% | 2956 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,527 psi | 71% | 2936 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,410 psi | 68% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 36,201 psi | 57% | 2858 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 48,965 psi | 77% | 3054 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 44% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,716 psi | 72% | 2904 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,387 psi | 81% | 2999 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,847 psi | 72% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,991 psi | 71% | 2890 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 86% | 42,105 psi | 66% | 2930 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,530 psi | 78% | 2956 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,051 psi | 75% | 2946 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 32,474 psi | 51% | 2608 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 45,788 psi | 72% | 2943 fps | 97.3% |
| Norma 217 | <<locked>> | 94% | 34,954 psi | 55% | 2815 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 37,956 psi | 59% | 2858 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 47,094 psi | 74% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 41,930 psi | 66% | 2940 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,730 psi | 72% | 2959 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,534 psi | 56% | 2756 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,182 psi | 76% | 3005 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,803 psi | 72% | 3015 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 33,330 psi | 52% | 2769 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,295 psi | 71% | 3054 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 41,466 psi | 65% | 2822 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 39,784 psi | 62% | 2831 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 50,444 psi | 79% | 2979 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,530 psi | 78% | 2956 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,051 psi | 75% | 2946 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,346 psi | 85% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,602 psi | 76% | 2900 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,436 psi | 62% | 2822 fps | 95.9% |
| Somchem S361 | <<locked>> | 82% | 45,078 psi | 71% | 2867 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,251 psi | 69% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,567 psi | 64% | 2815 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 52,446 psi | 82% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,298 psi | 76% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,521 psi | 59% | 2736 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 47,950 psi | 75% | 2963 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,494 psi | 62% | 2838 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,294 psi | 68% | 2966 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 43,932 psi | 69% | 2963 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 98% | 49,719 psi | 78% | 3130 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,253 psi | 74% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,559 psi | 78% | 3028 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,604 psi | 50% | 2782 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,407 psi | 62% | 2785 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 | 140gr | Barnes X S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,317 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 140.0 gr projectile in 0.284" calls for a 1:10.5 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. Accurate High Country, Alliant Reloder-26, Accurate MAGPRO rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Barnes X S 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.