Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 100gr | Sierra VarmintKing bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Alliant Reloder-17.
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% | 54,418 psi | 85% | 3438 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,811 psi | 87% | 3491 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,447 psi | 85% | 3524 fps | 98.8% |
| Accurate 4064 | <<locked>> | 84% | 54,853 psi | 86% | 3501 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,086 psi | 88% | 3602 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 57,261 psi | 90% | 3589 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,042 psi | 86% | 3527 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 98% | 57,334 psi | 90% | 3638 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,346 psi | 85% | 3661 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,811 psi | 87% | 3556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,985 psi | 88% | 3579 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,811 psi | 89% | 3675 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,462 psi | 85% | 3635 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,782 psi | 89% | 3625 fps | 97% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 3615 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 3547 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,483 psi | 70% | 3435 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,187 psi | 86% | 3707 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,551 psi | 90% | 3602 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 57,043 psi | 89% | 3576 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 3615 fps | 96.7% |
| Bofors RP7 | <<locked>> | 90% | 56,260 psi | 88% | 3547 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 86% | 57,276 psi | 90% | 3589 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 90% | 54,592 psi | 86% | 3589 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 88% | 54,215 psi | 85% | 3543 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,087 psi | 89% | 3579 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,752 psi | 86% | 3573 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,187 psi | 86% | 3622 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 2326 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,419 psi | 87% | 3540 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,360 psi | 85% | 3510 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,130 psi | 90% | 3547 fps | 98.4% |
| IMR 4350 | <<locked>> | 94% | 57,566 psi | 90% | 3579 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,505 psi | 85% | 3517 fps | 97.9% |
| IMR 4831 | <<locked>> | 94% | 56,652 psi | 89% | 3589 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 57,421 psi | 90% | 3619 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,956 psi | 88% | 3504 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,752 psi | 86% | 3507 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,621 psi | 86% | 3510 fps | 98.9% |
| Lovex S070 | <<locked>> | 92% | 55,985 psi | 88% | 3556 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,860 psi | 70% | 3330 fps | 96.8% |
| Norma 201 | <<locked>> | 82% | 55,840 psi | 88% | 3524 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,637 psi | 89% | 3524 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,288 psi | 87% | 3563 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,781 psi | 86% | 3563 fps | 96.3% |
| Norma MRP | <<locked>> | 98% | 53,853 psi | 84% | 3645 fps | 98% |
| Norma URP | <<locked>> | 92% | 54,723 psi | 86% | 3583 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 84% | 56,565 psi | 89% | 3589 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 57,508 psi | 90% | 3642 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 58% | 2375 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,217 psi | 90% | 3566 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,130 psi | 90% | 3661 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,882 psi | 84% | 3635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,376 psi | 88% | 3622 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,853 psi | 86% | 3652 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 84% | 56,710 psi | 89% | 3527 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,884 psi | 89% | 3570 fps | 100% |
| Rottweil R 905 | <<locked>> | 98% | 55,941 psi | 88% | 3606 fps | 97% |
| Rottweil R 907 | <<locked>> | 90% | 56,260 psi | 88% | 3547 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,621 psi | 86% | 3510 fps | 98.9% |
| Shooters World Precision | <<locked>> | 84% | 54,752 psi | 86% | 3507 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,985 psi | 88% | 3556 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,013 psi | 86% | 3570 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,840 psi | 88% | 3550 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,492 psi | 89% | 3451 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,201 psi | 85% | 3389 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,288 psi | 85% | 3448 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,521 psi | 87% | 3602 fps | 96.9% |
| Somchem S335 | <<locked>> | 82% | 56,318 psi | 88% | 3442 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,913 psi | 89% | 3566 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 54,244 psi | 85% | 3593 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,826 psi | 89% | 3579 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 57,000 psi | 89% | 3428 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,913 psi | 89% | 3484 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,334 psi | 90% | 3494 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,621 psi | 86% | 3474 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,855 psi | 89% | 3579 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,330 psi | 82% | 3474 fps | 96.7% |
| Vihtavuori N540 | <<locked>> | 84% | 55,564 psi | 87% | 3484 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,260 psi | 88% | 3583 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 3645 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,130 psi | 90% | 3537 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,810 psi | 86% | 3593 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,340 psi | 73% | 3599 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,217 psi | 88% | 3556 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3570 fps | 97% |
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% | 50,908 psi | 80% | 3379 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,834 psi | 77% | 3353 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 41,046 psi | 64% | 3245 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 48,196 psi | 76% | 3379 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,593 psi | 57% | 3169 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 53,563 psi | 84% | 3524 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 45,513 psi | 71% | 3337 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 94% | 50,241 psi | 79% | 3497 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,430 psi | 79% | 3583 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,035 psi | 72% | 3366 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,095 psi | 77% | 3445 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,694 psi | 56% | 3182 fps | 95.8% |
| Alliant Reloder-17 | 69.2 gr | 80% | 40,770 psi | 64% | 3343 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 49,719 psi | 78% | 3484 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 50,589 psi | 79% | 3543 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 86% | 31,879 psi | 50% | 3068 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 38,943 psi | 61% | 3284 fps | 95.6% |
| Alliant Reloder-26 | 78 gr | 88% | 37,724 psi | 59% | 3297 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,867 psi | 84% | 3533 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 46,485 psi | 73% | 3379 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 50,589 psi | 79% | 3543 fps | 95.8% |
| Bofors RP7 | <<locked>> | 84% | 46,514 psi | 73% | 3346 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 46,862 psi | 73% | 3383 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 44,396 psi | 70% | 3369 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 47,543 psi | 75% | 3402 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,228 psi | 52% | 3058 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,155 psi | 80% | 3507 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 44,106 psi | 69% | 3383 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 42% | 2087 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,837 psi | 81% | 3474 fps | 99.9% |
| IMR 4064 | <<locked>> | 80% | 47,848 psi | 75% | 3379 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,270 psi | 79% | 3409 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 47,311 psi | 74% | 3376 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 45,034 psi | 71% | 3314 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 35,230 psi | 55% | 3114 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 50,386 psi | 79% | 3484 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 52,373 psi | 82% | 3438 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 48,008 psi | 75% | 3379 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 39,726 psi | 62% | 3182 fps | 95.5% |
| Lovex S070 | <<locked>> | 84% | 43,308 psi | 68% | 3287 fps | 95.5% |
| Lovex S071 | <<locked>> | 96% | 39,291 psi | 62% | 3199 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,388 psi | 82% | 3461 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,142 psi | 83% | 3465 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,472 psi | 76% | 3432 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 51,082 psi | 80% | 3491 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 43,294 psi | 68% | 3409 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,463 psi | 57% | 3166 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 48,965 psi | 77% | 3448 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 40,814 psi | 64% | 3287 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,311 psi | 43% | 2133 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,905 psi | 74% | 3360 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,243 psi | 83% | 3593 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,323 psi | 68% | 3422 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,535 psi | 57% | 3186 fps | 95.4% |
| ReloadSwiss RS 70 | 72 gr | 82% | 38,276 psi | 60% | 3261 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 49,951 psi | 78% | 3402 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,511 psi | 68% | 3307 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 94% | 48,733 psi | 76% | 3461 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 46,514 psi | 73% | 3346 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,726 psi | 62% | 3182 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 48,008 psi | 75% | 3379 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 43,308 psi | 68% | 3287 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,846 psi | 70% | 3369 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,257 psi | 82% | 3484 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,171 psi | 83% | 3396 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,933 psi | 70% | 3225 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 44,527 psi | 70% | 3248 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 48,283 psi | 76% | 3455 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 52,968 psi | 83% | 3386 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,888 psi | 69% | 3307 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 32,982 psi | 52% | 3110 fps | 97.9% |
| Somchem S385 | <<locked>> | 92% | 46,369 psi | 73% | 3373 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 53,693 psi | 84% | 3379 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,082 psi | 78% | 3373 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,343 psi | 79% | 3379 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,930 psi | 66% | 3225 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 37,811 psi | 59% | 3169 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 98% | 48,965 psi | 77% | 3406 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 48,878 psi | 77% | 3366 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,507 psi | 59% | 3169 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 33,069 psi | 52% | 3100 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,449 psi | 59% | 3136 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 44,570 psi | 70% | 3373 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 30,429 psi | 48% | 3107 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,359 psi | 82% | 3491 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 49,443 psi | 77% | 3422 fps | 95.2% |
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 104 powders for 7 x 66 SE v. Hofe loaded with the .284 | 100gr | Sierra VarmintKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,707 fps; across all powders the maximum-charge window runs from 2,326 fps to 3,707 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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 100.0 gr projectile in 0.284" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Alliant Reloder-17 rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 100gr | Sierra VarmintKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Hodgdon H1000 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.