Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | Barnes X BT bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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% | 56,855 psi | 89% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,740 psi | 90% | 3041 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,696 psi | 90% | 3169 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 90% | 54,694 psi | 86% | 3104 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 57,421 psi | 90% | 3094 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,419 psi | 87% | 3100 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,534 psi | 84% | 3061 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,283 psi | 76% | 3028 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,404 psi | 85% | 3035 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,404 psi | 85% | 3035 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,551 psi | 90% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,174 psi | 90% | 3084 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,956 psi | 88% | 3100 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,334 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,579 psi | 89% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,070 psi | 85% | 3110 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,579 psi | 89% | 3051 fps | 96.7% |
| Bofors RP15 | <<locked>> | 94% | 55,216 psi | 87% | 3091 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3143 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 55,956 psi | 88% | 3100 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 55,477 psi | 87% | 2976 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 54,984 psi | 86% | 3087 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 82% | 54,911 psi | 86% | 3035 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,174 psi | 90% | 3041 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 55,274 psi | 87% | 3035 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,157 psi | 85% | 3015 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,752 psi | 86% | 2956 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,463 psi | 87% | 3212 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,143 psi | 86% | 3068 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1916 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,014 psi | 89% | 3015 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,594 psi | 89% | 2995 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,595 psi | 90% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,101 psi | 88% | 3015 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 94% | 57,246 psi | 90% | 3140 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,280 psi | 69% | 2940 fps | 97.3% |
| Lovex S065 | <<locked>> | 82% | 54,433 psi | 85% | 2946 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,159 psi | 88% | 2999 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,737 psi | 86% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,447 psi | 85% | 3018 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 44,643 psi | 70% | 2972 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 55,941 psi | 88% | 3127 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,506 psi | 87% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,346 psi | 85% | 3100 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 84% | 54,302 psi | 85% | 3022 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,608 psi | 89% | 3094 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 1959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,464 psi | 90% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,201 psi | 87% | 3087 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,318 psi | 88% | 3212 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3166 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 88% | 55,100 psi | 86% | 3002 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 57,043 psi | 89% | 3074 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 55,477 psi | 87% | 2976 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,433 psi | 85% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,159 psi | 88% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,043 psi | 89% | 2953 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,608 psi | 89% | 3071 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 56,594 psi | 89% | 2992 fps | 98.5% |
| Somchem S365 | <<locked>> | 86% | 56,376 psi | 88% | 3025 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,595 psi | 90% | 3045 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 57,740 psi | 90% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,029 psi | 89% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,913 psi | 89% | 3022 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 56,449 psi | 88% | 3015 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,608 psi | 89% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,492 psi | 87% | 3117 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 96% | 56,188 psi | 88% | 3107 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 3159 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,304 psi | 88% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,129 psi | 86% | 3035 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,622 psi | 87% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,174 psi | 90% | 3038 fps | 99.6% |
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% | 39,117 psi | 61% | 2694 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 50,937 psi | 80% | 2936 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,452 psi | 65% | 2854 fps | 96.1% |
| Accurate MAGPRO | <<locked>> | 84% | 44,904 psi | 70% | 2917 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,814 psi | 66% | 2802 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 40,219 psi | 63% | 2792 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 90% | 39,175 psi | 61% | 2762 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 86% | 31,647 psi | 50% | 2615 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,453 psi | 67% | 2805 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,453 psi | 67% | 2805 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,790 psi | 75% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,076 psi | 66% | 2799 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,159 psi | 60% | 2749 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,883 psi | 58% | 2710 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,300 psi | 51% | 2628 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,596 psi | 64% | 2864 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,285 psi | 79% | 2933 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 35,723 psi | 56% | 2684 fps | 95.2% |
| Bofors RP30 | <<locked>> | 88% | 38,609 psi | 61% | 2792 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 38,159 psi | 60% | 2749 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 52,257 psi | 82% | 2920 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 37,405 psi | 59% | 2723 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 51,663 psi | 81% | 2976 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,621 psi | 84% | 2982 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 42,743 psi | 67% | 2795 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,076 psi | 66% | 2782 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,513 psi | 71% | 2808 fps | 100% |
| Hodgdon Retumbo | 64.4 gr | 84% | 35,824 psi | 56% | 2772 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 51,372 psi | 81% | 3005 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 44% | 1709 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,514 psi | 74% | 2851 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,127 psi | 83% | 2940 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 48,008 psi | 75% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,510 psi | 65% | 2733 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 82% | 38,957 psi | 61% | 2776 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,117 psi | 61% | 2822 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 51,329 psi | 80% | 2897 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,864 psi | 78% | 2894 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 34,171 psi | 54% | 2575 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 47,950 psi | 75% | 2900 fps | 98.4% |
| Norma 217 | <<locked>> | 90% | 32,793 psi | 51% | 2680 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 39,958 psi | 63% | 2822 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 49,095 psi | 77% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,682 psi | 61% | 2782 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 47,964 psi | 75% | 2913 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 32,793 psi | 51% | 2605 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 1752 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,444 psi | 79% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,269 psi | 76% | 2972 fps | 100% |
| ReloadSwiss RS 76 | 67.3 gr | 82% | 32,953 psi | 52% | 2687 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,945 psi | 66% | 2900 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 43,163 psi | 68% | 2779 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,611 psi | 65% | 2789 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 52,257 psi | 82% | 2920 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,329 psi | 80% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,864 psi | 78% | 2894 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,401 psi | 79% | 2844 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,263 psi | 65% | 2782 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 44,121 psi | 69% | 2766 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 46,441 psi | 73% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,337 psi | 66% | 2769 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 54,375 psi | 85% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,488 psi | 79% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,956 psi | 58% | 2644 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 49,951 psi | 78% | 2910 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,640 psi | 65% | 2795 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 42,627 psi | 67% | 2867 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 86% | 40,741 psi | 64% | 2808 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 94% | 46,093 psi | 72% | 2976 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,313 psi | 77% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,663 psi | 81% | 2976 fps | 99.8% |
| Winchester StaBALL HD | 63 gr | 80% | 33,417 psi | 52% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,798 psi | 61% | 2694 fps | 96.4% |
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 | 150gr | Barnes X BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,212 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 59–90 %, leaving at least 10 % headroom. The 150.0 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, Bofors RP30 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | Barnes X BT 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.