Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 145gr | Speer Hot-Cor bullet and 74 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 Winchester StaBALL HD.
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% | 57,014 psi | 89% | 3084 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,346 psi | 85% | 3061 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,621 psi | 86% | 3179 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 92% | 55,651 psi | 87% | 3186 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 55,288 psi | 87% | 3123 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 56,739 psi | 89% | 3186 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 3077 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,658 psi | 72% | 3038 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,288 psi | 87% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,405 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,882 psi | 86% | 3110 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,840 psi | 89% | 3182 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,491 psi | 85% | 3094 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3212 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,882 psi | 86% | 3186 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,897 psi | 86% | 3081 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 55,999 psi | 88% | 3166 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,722 psi | 84% | 3156 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 56,840 psi | 89% | 3182 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 56,565 psi | 89% | 3061 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3169 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,912 psi | 88% | 3114 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,810 psi | 86% | 3071 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 56,623 psi | 89% | 3120 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,448 psi | 87% | 3100 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,579 psi | 87% | 3038 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3294 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,550 psi | 89% | 3153 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 58% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,708 psi | 86% | 3045 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,346 psi | 85% | 3028 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 54,665 psi | 86% | 3051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,377 psi | 90% | 3100 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 54,607 psi | 86% | 3159 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,075 psi | 64% | 2927 fps | 96.1% |
| Lovex S065 | <<locked>> | 84% | 55,259 psi | 87% | 3028 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,768 psi | 89% | 3077 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 54,650 psi | 86% | 3048 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,695 psi | 87% | 3104 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 41,408 psi | 65% | 2959 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 56,884 psi | 89% | 3205 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,289 psi | 88% | 3097 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,463 psi | 87% | 3182 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 55,303 psi | 87% | 3104 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,853 psi | 84% | 3110 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 60% | 2005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,476 psi | 85% | 3084 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,579 psi | 89% | 3173 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3294 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 3169 fps | 97.8% |
| Rottweil R 904 | <<locked>> | 90% | 56,217 psi | 88% | 3084 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 90% | 54,288 psi | 85% | 3097 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 56,565 psi | 89% | 3061 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,259 psi | 87% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,768 psi | 89% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,493 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,215 psi | 85% | 2976 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,624 psi | 90% | 3153 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 57,479 psi | 90% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 54,215 psi | 85% | 3018 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 57,101 psi | 89% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,737 psi | 86% | 3068 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,158 psi | 86% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,520 psi | 85% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,418 psi | 85% | 3048 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 57,450 psi | 90% | 3097 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,681 psi | 89% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,623 psi | 89% | 3199 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 56,652 psi | 89% | 3179 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,374 psi | 84% | 3173 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,070 psi | 85% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,130 psi | 88% | 3120 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,637 psi | 89% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,665 psi | 86% | 3061 fps | 99.4% |
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% | 35,462 psi | 56% | 2674 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 47,355 psi | 74% | 2943 fps | 100% |
| Accurate High Country | 67.7 gr | 82% | 41,234 psi | 65% | 2910 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 86% | 45,034 psi | 71% | 2979 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 39,494 psi | 62% | 2808 fps | 96.3% |
| ADI AR 2213 | <<locked>> | 84% | 40,321 psi | 63% | 2858 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 41,669 psi | 65% | 2884 fps | 96% |
| ADI AR 2225 | <<locked>> | 90% | 32,851 psi | 51% | 2707 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,368 psi | 71% | 2949 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,460 psi | 82% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,450 psi | 62% | 2802 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,855 psi | 59% | 2802 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,127 psi | 53% | 2703 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,646 psi | 46% | 2602 fps | 96% |
| Alliant Reloder-26 | 68.1 gr | 80% | 37,492 psi | 59% | 2851 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,532 psi | 81% | 3018 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 37,681 psi | 59% | 2795 fps | 95.7% |
| Bofors RP30 | <<locked>> | 90% | 38,101 psi | 60% | 2835 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 37,855 psi | 59% | 2802 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 49,893 psi | 78% | 2946 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 39,813 psi | 62% | 2844 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 49,023 psi | 77% | 2995 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 51,401 psi | 81% | 3012 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 43,192 psi | 68% | 2867 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,279 psi | 66% | 2848 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,844 psi | 67% | 2825 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 35,331 psi | 55% | 2818 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 48,776 psi | 76% | 3022 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 44% | 1752 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,252 psi | 71% | 2874 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,169 psi | 80% | 2972 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,005 psi | 71% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,974 psi | 66% | 2805 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 86% | 41,640 psi | 65% | 2900 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 38,522 psi | 60% | 2864 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 48,805 psi | 76% | 2920 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,036 psi | 74% | 2907 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 30,589 psi | 48% | 2543 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 45,397 psi | 71% | 2913 fps | 97.8% |
| Norma 217 | <<locked>> | 94% | 33,765 psi | 53% | 2762 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 37,086 psi | 58% | 2812 fps | 97.1% |
| Norma URP | <<locked>> | 80% | 46,282 psi | 73% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,522 psi | 60% | 2838 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 45,252 psi | 71% | 2927 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 34,432 psi | 54% | 2710 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,543 psi | 45% | 1798 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,485 psi | 74% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,643 psi | 72% | 2982 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,198 psi | 50% | 2720 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,904 psi | 70% | 3022 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 40,712 psi | 64% | 2785 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 38,957 psi | 61% | 2789 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 49,893 psi | 78% | 2946 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,805 psi | 76% | 2920 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,036 psi | 74% | 2907 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,056 psi | 85% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,805 psi | 75% | 2864 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,624 psi | 61% | 2785 fps | 96.2% |
| Somchem S355 | <<locked>> | 80% | 54,128 psi | 85% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,498 psi | 70% | 2838 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 43,526 psi | 68% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,421 psi | 62% | 2769 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 51,663 psi | 81% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,747 psi | 75% | 2923 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,127 psi | 53% | 2635 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,166 psi | 74% | 2927 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,247 psi | 60% | 2785 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 42,844 psi | 67% | 2933 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 88% | 40,277 psi | 63% | 2858 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 46,209 psi | 72% | 3035 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,094 psi | 74% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,226 psi | 77% | 2999 fps | 99.6% |
| Winchester StaBALL HD | 65.4 gr | 80% | 30,327 psi | 48% | 2723 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,056 psi | 56% | 2687 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 74 powders for 7 x 66 SE v. Hofe loaded with the .284 | 145gr | Speer Hot-Cor. Hodgdon Retumbo delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,294 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 145.0 gr projectile in 0.284" calls for a 1:13.0 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. Accurate High Country, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 145gr | Speer Hot-Cor 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.