Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 140gr | Barnes X BT bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Accurate High Country.
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% | 54,447 psi | 85% | 3071 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,303 psi | 87% | 3104 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,824 psi | 86% | 3215 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 92% | 55,680 psi | 87% | 3212 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 90% | 55,172 psi | 86% | 3150 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 56,565 psi | 89% | 3212 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,155 psi | 80% | 3100 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,006 psi | 72% | 3068 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,100 psi | 86% | 3150 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,492 psi | 89% | 3169 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,810 psi | 86% | 3136 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,913 psi | 89% | 3212 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,563 psi | 86% | 3130 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3241 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,882 psi | 86% | 3222 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,854 psi | 88% | 3192 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3186 fps | 98.7% |
| Bofors RP5 | <<locked>> | 94% | 56,913 psi | 89% | 3212 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 56,884 psi | 89% | 3091 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,202 psi | 88% | 3196 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 56,188 psi | 88% | 3150 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,100 psi | 86% | 3100 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 56,536 psi | 89% | 3143 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,390 psi | 87% | 3123 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,825 psi | 87% | 3071 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3320 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,376 psi | 88% | 3182 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,911 psi | 86% | 3074 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,520 psi | 85% | 3058 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 55,259 psi | 87% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,493 psi | 90% | 3127 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 54,520 psi | 85% | 3186 fps | 98.3% |
| Lovex S065 | <<locked>> | 84% | 55,753 psi | 87% | 3064 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,377 psi | 90% | 3114 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,535 psi | 87% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,724 psi | 87% | 3130 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2999 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 56,753 psi | 89% | 3235 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,608 psi | 89% | 3133 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,187 psi | 86% | 3205 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 86% | 55,434 psi | 87% | 3136 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,624 psi | 90% | 3202 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,319 psi | 60% | 2024 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,882 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,478 psi | 89% | 3205 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3320 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,330 psi | 82% | 3196 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 90% | 56,463 psi | 88% | 3117 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 90% | 54,491 psi | 85% | 3127 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 56,884 psi | 89% | 3091 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,753 psi | 87% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,377 psi | 90% | 3114 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,056 psi | 86% | 3012 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,580 psi | 90% | 3182 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 54,534 psi | 85% | 3045 fps | 97.6% |
| Somchem S365 | <<locked>> | 88% | 57,261 psi | 90% | 3136 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,347 psi | 87% | 3104 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 55,767 psi | 87% | 3005 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,795 psi | 86% | 3068 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,621 psi | 86% | 3077 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 84% | 54,230 psi | 85% | 3074 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,348 psi | 90% | 3163 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,362 psi | 88% | 3222 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 98% | 56,840 psi | 89% | 3209 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 3199 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 53,998 psi | 85% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,449 psi | 88% | 3153 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,854 psi | 88% | 3274 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,868 psi | 86% | 3091 fps | 99.1% |
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% | 37,202 psi | 58% | 2733 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 48,559 psi | 76% | 2989 fps | 100% |
| Accurate High Country | 65.7 gr | 82% | 42,076 psi | 66% | 2956 fps | 95.5% |
| Accurate MAGPRO | 70.2 gr | 86% | 45,556 psi | 71% | 3018 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 40,132 psi | 63% | 2844 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 86% | 43,772 psi | 69% | 2956 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 42,264 psi | 66% | 2913 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 34,040 psi | 53% | 2759 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,600 psi | 71% | 2982 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,779 psi | 83% | 3110 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,176 psi | 63% | 2841 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,812 psi | 61% | 2848 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,186 psi | 55% | 2756 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,937 psi | 48% | 2661 fps | 96.1% |
| Alliant Reloder-26 | 66.1 gr | 80% | 38,580 psi | 60% | 2907 fps | 99.3% |
| Bofors RP15 | <<locked>> | 84% | 38,522 psi | 60% | 2841 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 41,568 psi | 65% | 2943 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 38,812 psi | 61% | 2848 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 50,531 psi | 79% | 2979 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 40,567 psi | 64% | 2877 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 49,371 psi | 77% | 3028 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 51,677 psi | 81% | 3038 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,557 psi | 73% | 2959 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,759 psi | 72% | 2943 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,453 psi | 68% | 2864 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 36,274 psi | 57% | 2861 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,994 psi | 77% | 3054 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 44% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,774 psi | 72% | 2904 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,416 psi | 81% | 2999 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,934 psi | 72% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,223 psi | 71% | 2897 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 42,134 psi | 66% | 2933 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,588 psi | 78% | 2956 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,080 psi | 75% | 2949 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 32,503 psi | 51% | 2612 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 45,963 psi | 72% | 2949 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,027 psi | 55% | 2818 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,000 psi | 60% | 2858 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 47,123 psi | 74% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 42,119 psi | 66% | 2946 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,919 psi | 72% | 2963 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,563 psi | 56% | 2759 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 45% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,225 psi | 76% | 3009 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,064 psi | 72% | 3022 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 33,373 psi | 52% | 2772 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,484 psi | 71% | 3058 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 41,553 psi | 65% | 2825 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 39,813 psi | 62% | 2831 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 50,531 psi | 79% | 2979 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,588 psi | 78% | 2956 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,080 psi | 75% | 2949 fps | 99.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,631 psi | 76% | 2900 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,465 psi | 62% | 2825 fps | 96% |
| Somchem S361 | <<locked>> | 82% | 45,136 psi | 71% | 2867 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,280 psi | 69% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,582 psi | 64% | 2815 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 52,475 psi | 82% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,327 psi | 76% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,230 psi | 55% | 2677 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 48,037 psi | 75% | 2966 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,566 psi | 62% | 2838 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,323 psi | 68% | 2969 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 43,990 psi | 69% | 2963 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 98% | 49,966 psi | 78% | 3136 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,326 psi | 74% | 2913 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,617 psi | 78% | 3035 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,807 psi | 50% | 2789 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,479 psi | 62% | 2792 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 76 powders for 7 x 66 SE v. Hofe loaded with the .284 | 140gr | Barnes X BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,320 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,320 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, 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 MAGPRO, Alliant Reloder-26, Accurate High Country rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 140gr | Barnes X BT 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.