Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 120gr | Barnes Solid bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Norma MRP and ReloadSwiss RS 70.
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 2495 | <<locked>> | 82% | 57,595 psi | 90% | 3219 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,911 psi | 86% | 3232 fps | 98.5% |
| Accurate 3100 | <<locked>> | 98% | 53,983 psi | 85% | 3278 fps | 99.5% |
| Accurate 4064 | <<locked>> | 82% | 54,491 psi | 85% | 3225 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,869 psi | 88% | 3343 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,347 psi | 87% | 3438 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 98% | 56,492 psi | 89% | 3435 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 84% | 54,288 psi | 85% | 3258 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,768 psi | 89% | 3389 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 98% | 54,636 psi | 86% | 3379 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,740 psi | 90% | 3455 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,971 psi | 89% | 3383 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,347 psi | 87% | 3287 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,419 psi | 87% | 3307 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,507 psi | 89% | 3409 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,954 psi | 85% | 3366 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,188 psi | 88% | 3373 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3438 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 3360 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,340 psi | 74% | 3281 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,781 psi | 86% | 3451 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3346 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 56,260 psi | 88% | 3301 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3438 fps | 98.6% |
| Bofors RP7 | <<locked>> | 88% | 55,637 psi | 87% | 3284 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 84% | 56,492 psi | 89% | 3320 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,128 psi | 85% | 3333 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 57,319 psi | 90% | 3353 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 54,665 psi | 86% | 3314 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,363 psi | 90% | 3363 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,884 psi | 89% | 3317 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,253 psi | 72% | 3314 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 88% | 54,505 psi | 85% | 3369 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 57% | 2116 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,174 psi | 90% | 3297 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,188 psi | 88% | 3278 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 56,753 psi | 89% | 3317 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,130 psi | 90% | 3314 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 56,057 psi | 88% | 3330 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,913 psi | 89% | 3343 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,057 psi | 88% | 3304 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,709 psi | 87% | 3412 fps | 97% |
| Lovex S062 | <<locked>> | 84% | 57,624 psi | 90% | 3291 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,551 psi | 90% | 3314 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,405 psi | 87% | 3297 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,080 psi | 75% | 3173 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 54,781 psi | 86% | 3294 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,998 psi | 85% | 3310 fps | 97.6% |
| Norma MRP | <<locked>> | 98% | 57,450 psi | 90% | 3468 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 54,331 psi | 85% | 3323 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,651 psi | 87% | 3317 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3438 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 56,898 psi | 89% | 3383 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,749 psi | 80% | 3287 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 58% | 2165 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,347 psi | 88% | 3301 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,305 psi | 90% | 3422 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,811 psi | 87% | 3366 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,172 psi | 85% | 3392 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,717 psi | 73% | 3310 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 55,869 psi | 88% | 3248 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,565 psi | 89% | 3301 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,621 psi | 86% | 3291 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 96% | 55,405 psi | 87% | 3356 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 55,637 psi | 87% | 3284 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,551 psi | 90% | 3314 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 57,624 psi | 90% | 3291 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,405 psi | 87% | 3297 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,331 psi | 85% | 3301 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,058 psi | 89% | 3169 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,087 psi | 89% | 3258 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,940 psi | 86% | 3350 fps | 98.1% |
| Somchem S355 | <<locked>> | 86% | 56,159 psi | 88% | 3291 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,666 psi | 89% | 3281 fps | 96.4% |
| Somchem S365 | <<locked>> | 92% | 53,954 psi | 85% | 3323 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,144 psi | 88% | 3330 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 56,231 psi | 88% | 3202 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,565 psi | 89% | 3215 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,696 psi | 90% | 3264 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,463 psi | 88% | 3317 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3301 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 54,955 psi | 86% | 3209 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,680 psi | 87% | 3320 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,087 psi | 89% | 3392 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,464 psi | 90% | 3458 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,115 psi | 88% | 3271 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,360 psi | 85% | 3337 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,444 psi | 79% | 3432 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,550 psi | 89% | 3323 fps | 98.2% |
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% | 53,983 psi | 85% | 3166 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,372 psi | 81% | 3166 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 35,766 psi | 56% | 2897 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 51,169 psi | 80% | 3169 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,291 psi | 62% | 3012 fps | 98.2% |
| Accurate High Country | 74.1 gr | 92% | 48,022 psi | 75% | 3294 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 96% | 52,605 psi | 82% | 3363 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 47,906 psi | 75% | 3140 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 43,395 psi | 68% | 3120 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 50,937 psi | 80% | 3307 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,795 psi | 84% | 3389 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,671 psi | 68% | 3120 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,602 psi | 76% | 3169 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,851 psi | 81% | 3248 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,971 psi | 60% | 3025 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,555 psi | 68% | 3169 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 43,192 psi | 68% | 3110 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,874 psi | 69% | 3169 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,021 psi | 44% | 2736 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,098 psi | 53% | 2936 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 82% | 32,387 psi | 51% | 2930 fps | 95.5% |
| Bofors RP15 | <<locked>> | 94% | 43,265 psi | 68% | 3153 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 49,240 psi | 77% | 3182 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,874 psi | 69% | 3169 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 43,062 psi | 67% | 3031 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,530 psi | 78% | 3196 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 41,350 psi | 65% | 3068 fps | 96.3% |
| Hodgdon H4350 | <<locked>> | 80% | 44,034 psi | 69% | 3091 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 94% | 50,923 psi | 80% | 3245 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,447 psi | 84% | 3291 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,563 psi | 56% | 2904 fps | 98.8% |
| Hodgdon Retumbo | <<locked>> | 98% | 43,207 psi | 68% | 3235 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 40,451 psi | 63% | 3077 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 43% | 1896 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,357 psi | 79% | 3179 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,591 psi | 82% | 3212 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 41,220 psi | 65% | 3009 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,454 psi | 70% | 3068 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 37,652 psi | 59% | 2956 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 53,214 psi | 83% | 3278 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,707 psi | 83% | 3241 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 48,588 psi | 76% | 3271 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 50,836 psi | 80% | 3179 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,032 psi | 66% | 3012 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 40,306 psi | 63% | 2989 fps | 96.2% |
| Lovex S071 | <<locked>> | 90% | 34,650 psi | 54% | 2867 fps | 95% |
| Norma 203B | <<locked>> | 80% | 51,227 psi | 80% | 3232 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,874 psi | 69% | 3107 fps | 95% |
| Norma MRP | 70.9 gr | 88% | 40,219 psi | 63% | 3117 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,015 psi | 61% | 3009 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 52,069 psi | 82% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 48,791 psi | 76% | 3284 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 37,942 psi | 59% | 2989 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 94% | 40,524 psi | 64% | 3068 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 43% | 1942 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,400 psi | 77% | 3173 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,267 psi | 73% | 3235 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,218 psi | 61% | 3031 fps | 97.9% |
| ReloadSwiss RS 70 | 65.8 gr | 80% | 37,971 psi | 60% | 3038 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 40,292 psi | 63% | 3146 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 52,460 psi | 82% | 3192 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,398 psi | 73% | 3123 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 48,095 psi | 75% | 3163 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 42,351 psi | 66% | 3091 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,062 psi | 67% | 3031 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,032 psi | 66% | 3012 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 50,836 psi | 80% | 3179 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,306 psi | 63% | 2989 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,674 psi | 75% | 3182 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,268 psi | 74% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,220 psi | 65% | 2946 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,817 psi | 70% | 3150 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,485 psi | 73% | 3120 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 52,837 psi | 83% | 3212 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 35,491 psi | 56% | 2959 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 40,277 psi | 63% | 3009 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 52,924 psi | 83% | 3150 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,142 psi | 83% | 3163 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,512 psi | 70% | 3038 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,321 psi | 63% | 3005 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 42,438 psi | 67% | 3045 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 51,488 psi | 81% | 3156 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,943 psi | 63% | 3009 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 31,024 psi | 49% | 2825 fps | 96% |
| Vihtavuori N560 | <<locked>> | 94% | 49,980 psi | 78% | 3314 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,552 psi | 62% | 2969 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 41,350 psi | 65% | 3068 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,614 psi | 42% | 2769 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 92% | 45,571 psi | 71% | 3120 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 89 powders for 7 x 66 SE v. Hofe loaded with the .284 | 120gr | Barnes Solid. Norma MRP delivers the highest muzzle velocity at 3,468 fps; across all powders the maximum-charge window runs from 2,116 fps to 3,468 fps. Alliant Reloder-22 gives the best case fill at 100 %, and 89 of the 89 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 120.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, 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. Accurate High Country, Norma MRP, ReloadSwiss RS 70 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 120gr | Barnes Solid 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.