Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 127gr | Hasler Hunting bullet and 88 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 Alliant Reloder-26.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 56,275 psi | 88% | 3189 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 55,564 psi | 87% | 3238 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 55,390 psi | 87% | 3166 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,261 psi | 90% | 3294 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 57,334 psi | 90% | 3406 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 96% | 54,462 psi | 85% | 3333 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 55,535 psi | 87% | 3205 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,694 psi | 86% | 3284 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 98% | 56,115 psi | 88% | 3343 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 3009 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,897 psi | 86% | 3278 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,637 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,710 psi | 89% | 3258 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,549 psi | 85% | 3301 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,898 psi | 88% | 3320 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,143 psi | 85% | 3268 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,564 psi | 87% | 3337 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 3317 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,646 psi | 76% | 3238 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,072 psi | 89% | 3409 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,447 psi | 85% | 3314 fps | 98.4% |
| Bofors RP3 | <<locked>> | 84% | 57,450 psi | 90% | 3248 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,564 psi | 87% | 3337 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 56,797 psi | 89% | 3238 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,138 psi | 75% | 3176 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 82% | 54,172 psi | 85% | 3209 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,579 psi | 87% | 3287 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 54,984 psi | 86% | 3248 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 96% | 56,434 psi | 88% | 3281 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,201 psi | 87% | 3258 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,752 psi | 86% | 3212 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,718 psi | 75% | 3291 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 88% | 56,391 psi | 88% | 3330 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,564 psi | 57% | 2067 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,882 psi | 86% | 3186 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,392 psi | 90% | 3228 fps | 99.6% |
| IMR 4350 | <<locked>> | 90% | 54,679 psi | 86% | 3215 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,940 psi | 86% | 3209 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 57,740 psi | 90% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,667 psi | 90% | 3268 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3383 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 55,230 psi | 87% | 3182 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,230 psi | 87% | 3205 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,565 psi | 89% | 3251 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,182 psi | 77% | 3127 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 56,014 psi | 88% | 3241 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,695 psi | 87% | 3274 fps | 98.4% |
| Norma MRP | <<locked>> | 96% | 55,434 psi | 87% | 3363 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 55,753 psi | 87% | 3274 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,101 psi | 89% | 3264 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,389 psi | 85% | 3333 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 90% | 54,853 psi | 86% | 3278 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,547 psi | 82% | 3258 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 58% | 2116 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,925 psi | 85% | 3189 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,100 psi | 86% | 3307 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,406 psi | 90% | 3317 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,072 psi | 88% | 3350 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,196 psi | 76% | 3284 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 56,927 psi | 89% | 3192 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 53,940 psi | 85% | 3186 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,246 psi | 88% | 3251 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 96% | 57,203 psi | 90% | 3320 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 88% | 56,797 psi | 89% | 3238 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,230 psi | 87% | 3205 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 55,230 psi | 87% | 3182 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,565 psi | 89% | 3251 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,927 psi | 88% | 3255 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,694 psi | 86% | 3064 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,723 psi | 86% | 3153 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,724 psi | 89% | 3314 fps | 98.8% |
| Somchem S355 | <<locked>> | 86% | 57,363 psi | 90% | 3238 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,273 psi | 85% | 3179 fps | 96.6% |
| Somchem S365 | <<locked>> | 92% | 55,840 psi | 88% | 3278 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,998 psi | 85% | 3225 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 57,508 psi | 90% | 3143 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,361 psi | 87% | 3156 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,099 psi | 85% | 3209 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3261 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 56,101 psi | 88% | 3156 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,000 psi | 89% | 3271 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,926 psi | 86% | 3284 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,506 psi | 87% | 3353 fps | 97.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 3248 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,867 psi | 84% | 3166 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,811 psi | 87% | 3294 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,156 psi | 83% | 3392 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,273 psi | 85% | 3222 fps | 98.3% |
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 2700 | <<locked>> | 80% | 52,402 psi | 82% | 3123 fps | 98.6% |
| Accurate 3100 | <<locked>> | 84% | 33,852 psi | 53% | 2789 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 51,938 psi | 81% | 3110 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,074 psi | 63% | 2966 fps | 98.8% |
| Accurate High Country | <<locked>> | 90% | 46,064 psi | 72% | 3186 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 94% | 50,502 psi | 79% | 3258 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 48,950 psi | 77% | 3094 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,626 psi | 65% | 3015 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 92% | 45,585 psi | 71% | 3133 fps | 95% |
| ADI AR 2225 | <<locked>> | 98% | 36,013 psi | 56% | 2940 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,930 psi | 66% | 3018 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,705 psi | 78% | 3117 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,026 psi | 83% | 3196 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,914 psi | 61% | 2982 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,831 psi | 70% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,495 psi | 65% | 3012 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,192 psi | 66% | 3068 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,485 psi | 45% | 2697 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,605 psi | 51% | 2838 fps | 95.5% |
| Alliant Reloder-26 | 66.8 gr | 80% | 30,763 psi | 48% | 2822 fps | 95.4% |
| Bofors RP15 | <<locked>> | 92% | 41,582 psi | 65% | 3051 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 50,227 psi | 79% | 3130 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,192 psi | 66% | 3068 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,874 psi | 69% | 2989 fps | 97% |
| Hodgdon H1000 | <<locked>> | 98% | 44,991 psi | 71% | 3107 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,589 psi | 79% | 3146 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 42,351 psi | 66% | 3028 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 45,092 psi | 71% | 3054 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 92% | 48,979 psi | 77% | 3146 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,877 psi | 75% | 3120 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,448 psi | 57% | 2861 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,684 psi | 65% | 3143 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,495 psi | 65% | 3041 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 43% | 1850 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,503 psi | 81% | 3130 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,737 psi | 84% | 3166 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 39,494 psi | 62% | 2907 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,397 psi | 71% | 3025 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 38,450 psi | 60% | 2913 fps | 98.6% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,398 psi | 74% | 3074 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 46,688 psi | 73% | 3173 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 51,634 psi | 81% | 3120 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,743 psi | 67% | 2966 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 41,060 psi | 64% | 2946 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 32,909 psi | 52% | 2762 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 52,359 psi | 82% | 3179 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,105 psi | 66% | 3005 fps | 95.2% |
| Norma MRP | 69.7 gr | 86% | 38,450 psi | 60% | 3009 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 39,943 psi | 63% | 2966 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 53,359 psi | 84% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 46,644 psi | 73% | 3179 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 38,870 psi | 61% | 2949 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 92% | 38,580 psi | 60% | 2966 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,659 psi | 43% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,444 psi | 79% | 3127 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,688 psi | 75% | 3186 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,190 psi | 63% | 2989 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,885 psi | 61% | 3002 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,566 psi | 60% | 3048 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,432 psi | 84% | 3136 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,297 psi | 74% | 3071 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,166 psi | 72% | 3061 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 40,611 psi | 64% | 2989 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 43,874 psi | 69% | 2989 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,743 psi | 67% | 2966 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 51,634 psi | 81% | 3120 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,060 psi | 64% | 2946 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,820 psi | 77% | 3133 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,269 psi | 76% | 2963 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,887 psi | 66% | 2904 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,248 psi | 63% | 2982 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 47,427 psi | 74% | 3068 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,792 psi | 80% | 3114 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 36,448 psi | 57% | 2913 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 38,377 psi | 60% | 2904 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 54,114 psi | 85% | 3094 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,426 psi | 71% | 2989 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,263 psi | 65% | 2963 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 40,741 psi | 64% | 2949 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 52,504 psi | 82% | 3100 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,756 psi | 64% | 2966 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 31,647 psi | 50% | 2782 fps | 97% |
| Vihtavuori N560 | 74.6 gr | 92% | 48,153 psi | 75% | 3212 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 47,529 psi | 74% | 3179 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,625 psi | 64% | 2930 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 42,351 psi | 66% | 3028 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,135 psi | 39% | 2661 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,640 psi | 64% | 2949 fps | 95% |
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 88 powders for 7 x 66 SE v. Hofe loaded with the .284 | 127gr | Hasler Hunting. Alliant Reloder-26 delivers the highest muzzle velocity at 3,409 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,409 fps. ADI AR 2225 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 127.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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, Alliant Reloder-26 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 127gr | Hasler Hunting 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.