Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 127gr | Geco ZERO LG bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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 2495 | <<locked>> | 82% | 56,492 psi | 89% | 3123 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,433 psi | 85% | 3150 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3255 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 57,174 psi | 90% | 3186 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,839 psi | 86% | 3248 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,898 psi | 88% | 3353 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 86% | 57,334 psi | 90% | 3228 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,173 psi | 88% | 3304 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,740 psi | 90% | 3363 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,276 psi | 90% | 3366 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,347 psi | 88% | 3297 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,737 psi | 86% | 3196 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,766 psi | 86% | 3219 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,883 psi | 88% | 3317 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,609 psi | 90% | 3343 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,579 psi | 87% | 3287 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3353 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 3271 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,514 psi | 73% | 3192 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,070 psi | 85% | 3363 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,040 psi | 82% | 3264 fps | 97.8% |
| Bofors RP3 | <<locked>> | 84% | 55,521 psi | 87% | 3209 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3353 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 54,955 psi | 86% | 3199 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 55,956 psi | 88% | 3232 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,319 psi | 90% | 3310 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 56,637 psi | 89% | 3264 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 54,114 psi | 85% | 3232 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,666 psi | 89% | 3274 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,188 psi | 88% | 3228 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,522 psi | 90% | 3271 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,484 psi | 71% | 3228 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 88% | 53,911 psi | 84% | 3284 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 57% | 2051 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,682 psi | 90% | 3232 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,811 psi | 89% | 3209 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,695 psi | 87% | 3189 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 56,202 psi | 88% | 3235 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,608 psi | 89% | 3228 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 55,550 psi | 87% | 3245 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,246 psi | 88% | 3251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,434 psi | 87% | 3219 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3330 fps | 97.4% |
| Lovex S062 | <<locked>> | 84% | 56,855 psi | 89% | 3199 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,869 psi | 89% | 3225 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,737 psi | 86% | 3212 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,949 psi | 74% | 3084 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 54,085 psi | 85% | 3202 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,450 psi | 90% | 3297 fps | 98.5% |
| Norma MRP | <<locked>> | 98% | 56,724 psi | 89% | 3383 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 57,464 psi | 90% | 3294 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,071 psi | 86% | 3228 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3346 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 56,420 psi | 88% | 3297 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,922 psi | 78% | 3205 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 58% | 2100 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,970 psi | 88% | 3215 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,913 psi | 89% | 3333 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,216 psi | 87% | 3278 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,566 psi | 90% | 3369 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,730 psi | 72% | 3222 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,158 psi | 86% | 3156 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,608 psi | 87% | 3209 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,070 psi | 85% | 3205 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 54,897 psi | 86% | 3274 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,955 psi | 86% | 3199 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,869 psi | 89% | 3225 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 56,855 psi | 89% | 3199 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,737 psi | 86% | 3212 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,537 psi | 90% | 3274 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,463 psi | 88% | 3081 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,550 psi | 89% | 3173 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,433 psi | 85% | 3268 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 55,521 psi | 87% | 3202 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,956 psi | 88% | 3196 fps | 96.7% |
| Somchem S365 | <<locked>> | 94% | 57,029 psi | 89% | 3291 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,434 psi | 87% | 3241 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 55,782 psi | 87% | 3114 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,173 psi | 88% | 3130 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,029 psi | 89% | 3176 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,767 psi | 87% | 3228 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3215 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 54,375 psi | 85% | 3123 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,955 psi | 86% | 3232 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,173 psi | 88% | 3301 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,884 psi | 89% | 3369 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,782 psi | 87% | 3192 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,580 psi | 90% | 3314 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,792 psi | 78% | 3343 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,796 psi | 87% | 3238 fps | 98.4% |
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 2495 | <<locked>> | 80% | 52,765 psi | 83% | 3068 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,763 psi | 80% | 3081 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 34,722 psi | 54% | 2808 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 50,082 psi | 78% | 3077 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,406 psi | 60% | 2923 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 96% | 51,880 psi | 81% | 3281 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,558 psi | 75% | 3058 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,975 psi | 67% | 3038 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 94% | 46,992 psi | 74% | 3153 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,185 psi | 83% | 3297 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,076 psi | 68% | 3038 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,964 psi | 75% | 3077 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,314 psi | 80% | 3159 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,550 psi | 59% | 2946 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,004 psi | 67% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,569 psi | 67% | 3028 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,192 psi | 68% | 3087 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,267 psi | 43% | 2654 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,417 psi | 52% | 2861 fps | 95.7% |
| Alliant Reloder-26 | 66.1 gr | 82% | 31,560 psi | 49% | 2844 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 42,583 psi | 67% | 3071 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 48,486 psi | 76% | 3094 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,192 psi | 68% | 3087 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 42,424 psi | 66% | 2949 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,776 psi | 76% | 3107 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,654 psi | 64% | 2982 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,598 psi | 68% | 3012 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 50,488 psi | 79% | 3166 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,356 psi | 77% | 3143 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,027 psi | 55% | 2822 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,621 psi | 84% | 3212 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,525 psi | 67% | 3153 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 39,653 psi | 62% | 2989 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 42% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,085 psi | 85% | 3176 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,038 psi | 78% | 3094 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,243 psi | 82% | 3127 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 38,130 psi | 60% | 2867 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,961 psi | 69% | 2986 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,912 psi | 58% | 2871 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 52,649 psi | 83% | 3189 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,718 psi | 76% | 3094 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 96% | 47,921 psi | 75% | 3189 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 50,125 psi | 79% | 3091 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,278 psi | 65% | 2927 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 39,595 psi | 62% | 2904 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 33,736 psi | 53% | 2782 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 50,662 psi | 79% | 3143 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,453 psi | 68% | 3028 fps | 95.4% |
| Norma MRP | 67.3 gr | 86% | 36,666 psi | 57% | 2959 fps | 95% |
| Norma URP | <<locked>> | 80% | 38,363 psi | 60% | 2927 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 51,372 psi | 81% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 48,037 psi | 75% | 3202 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 37,289 psi | 58% | 2907 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 94% | 39,639 psi | 62% | 2982 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,557 psi | 43% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,776 psi | 76% | 3087 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,716 psi | 72% | 3146 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,450 psi | 60% | 2946 fps | 98.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,231 psi | 58% | 2953 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,494 psi | 62% | 3064 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 80% | 51,895 psi | 81% | 3104 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,571 psi | 71% | 3035 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,572 psi | 75% | 3081 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 88% | 41,655 psi | 65% | 3009 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,424 psi | 66% | 2949 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,278 psi | 65% | 2927 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 50,125 psi | 79% | 3091 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,595 psi | 62% | 2904 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,065 psi | 74% | 3094 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,833 psi | 73% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,553 psi | 64% | 2867 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,278 psi | 65% | 3002 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 45,745 psi | 72% | 3031 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,791 psi | 76% | 3064 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 34,780 psi | 55% | 2874 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 39,465 psi | 62% | 2923 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 52,373 psi | 82% | 3061 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,591 psi | 82% | 3077 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,845 psi | 69% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,740 psi | 62% | 2923 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 41,742 psi | 65% | 2963 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 50,763 psi | 80% | 3064 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,160 psi | 61% | 2920 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 30,139 psi | 47% | 2736 fps | 96.1% |
| Vihtavuori N560 | 73.6 gr | 94% | 49,371 psi | 77% | 3232 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,030 psi | 61% | 2890 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,828 psi | 64% | 2986 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,715 psi | 40% | 2680 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,887 psi | 66% | 2972 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 90 powders for 7 x 66 SE v. Hofe loaded with the .284 | 127gr | Geco ZERO LG. Norma MRP delivers the highest muzzle velocity at 3,383 fps; across all powders the maximum-charge window runs from 2,051 fps to 3,383 fps. Accurate 3100 gives the best case fill at 100 %, and 90 of the 90 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 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 127gr | Geco ZERO LG 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.