Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 110gr | Barnes TTSX FB bullet and 95 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 Hodgdon Superformance.
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>> | 84% | 57,101 psi | 89% | 3346 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,637 psi | 87% | 3363 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,780 psi | 84% | 3396 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 53,983 psi | 85% | 3353 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,593 psi | 87% | 3465 fps | 99.9% |
| Accurate High Country | <<locked>> | 98% | 55,071 psi | 86% | 3553 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 56,927 psi | 89% | 3448 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,882 psi | 86% | 3392 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,145 psi | 90% | 3514 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,099 psi | 85% | 3524 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,711 psi | 90% | 3461 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,593 psi | 87% | 3422 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,724 psi | 87% | 3442 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,449 psi | 88% | 3533 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,041 psi | 85% | 3497 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,347 psi | 88% | 3494 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3488 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,589 psi | 79% | 3419 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,816 psi | 69% | 3307 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,708 psi | 86% | 3576 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,319 psi | 90% | 3461 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,950 psi | 77% | 3389 fps | 95.9% |
| Bofors RP3 | <<locked>> | 86% | 56,376 psi | 88% | 3435 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3488 fps | 97.2% |
| Bofors RP7 | <<locked>> | 90% | 55,869 psi | 88% | 3412 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 56,869 psi | 89% | 3451 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 54,128 psi | 85% | 3455 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 90% | 57,711 psi | 90% | 3481 fps | 98% |
| Hodgdon H4895 | <<locked>> | 82% | 57,566 psi | 90% | 3458 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,913 psi | 89% | 3445 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,491 psi | 85% | 3435 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,868 psi | 86% | 3494 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 56% | 2208 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,143 psi | 86% | 3399 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,041 psi | 85% | 3373 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,884 psi | 89% | 3409 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 57,058 psi | 89% | 3445 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,157 psi | 85% | 3383 fps | 98.3% |
| IMR 4831 | <<locked>> | 94% | 56,173 psi | 88% | 3458 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 57,217 psi | 90% | 3478 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 57,522 psi | 90% | 3415 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,767 psi | 87% | 3363 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,740 psi | 90% | 3425 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,609 psi | 90% | 3438 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 55,506 psi | 87% | 3422 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,179 psi | 69% | 3205 fps | 97.3% |
| Norma 201 | <<locked>> | 82% | 55,405 psi | 87% | 3383 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,362 psi | 88% | 3383 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,027 psi | 86% | 3428 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,346 psi | 85% | 3435 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3593 fps | 99% |
| Norma URP | <<locked>> | 92% | 54,360 psi | 85% | 3448 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 84% | 56,144 psi | 88% | 3451 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 57,217 psi | 90% | 3510 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,818 psi | 73% | 3317 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 57% | 2257 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,985 psi | 89% | 3432 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,811 psi | 89% | 3524 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,537 psi | 90% | 3560 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,651 psi | 87% | 3484 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,433 psi | 85% | 3517 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,086 psi | 88% | 3383 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,478 psi | 89% | 3432 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,085 psi | 86% | 3412 fps | 96% |
| Rottweil R 905 | <<locked>> | 98% | 55,419 psi | 87% | 3474 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 55,869 psi | 88% | 3412 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,609 psi | 90% | 3438 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,522 psi | 90% | 3415 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,740 psi | 90% | 3425 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,506 psi | 87% | 3422 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,781 psi | 86% | 3435 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,521 psi | 87% | 3412 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,260 psi | 88% | 3310 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,595 psi | 90% | 3307 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,522 psi | 90% | 3383 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,940 psi | 86% | 3468 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 55,970 psi | 88% | 3301 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,304 psi | 88% | 3422 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 57,580 psi | 90% | 3514 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,072 psi | 88% | 3445 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 56,797 psi | 89% | 3287 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,478 psi | 89% | 3340 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,116 psi | 90% | 3356 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,360 psi | 85% | 3337 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,594 psi | 89% | 3445 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,011 psi | 82% | 3350 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 55,259 psi | 87% | 3343 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,608 psi | 87% | 3445 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3507 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3576 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,782 psi | 89% | 3406 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,389 psi | 85% | 3458 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,658 psi | 72% | 3468 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,738 psi | 87% | 3419 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,826 psi | 89% | 3442 fps | 97.6% |
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% | 50,082 psi | 78% | 3235 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,544 psi | 76% | 3228 fps | 96.6% |
| Accurate 3100 | <<locked>> | 90% | 37,478 psi | 59% | 3048 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 47,456 psi | 74% | 3235 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,940 psi | 56% | 3041 fps | 96.4% |
| Accurate High Country | <<locked>> | 96% | 51,271 psi | 80% | 3474 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 53,258 psi | 83% | 3383 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,252 psi | 71% | 3205 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 92% | 46,557 psi | 73% | 3301 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,169 psi | 79% | 3451 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,983 psi | 85% | 3396 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,556 psi | 71% | 3232 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,718 psi | 76% | 3310 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,360 psi | 55% | 3061 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,292 psi | 63% | 3215 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,108 psi | 72% | 3291 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,572 psi | 73% | 3340 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,254 psi | 46% | 2881 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,810 psi | 56% | 3091 fps | 95.1% |
| Alliant Reloder-26 | 72.7 gr | 86% | 34,272 psi | 54% | 3091 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,447 psi | 84% | 3396 fps | 99.8% |
| Bofors RP15 | <<locked>> | 98% | 45,847 psi | 72% | 3323 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 45,759 psi | 72% | 3238 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 46,572 psi | 73% | 3340 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 43,047 psi | 67% | 3146 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,296 psi | 73% | 3248 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 41,089 psi | 64% | 3173 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 47,239 psi | 74% | 3278 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 53,838 psi | 84% | 3396 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,808 psi | 51% | 2940 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,720 psi | 79% | 3366 fps | 100% |
| Hodgdon Superformance | 73.3 gr | 84% | 43,656 psi | 68% | 3261 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 42% | 1978 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,590 psi | 81% | 3337 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,572 psi | 75% | 3248 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,850 psi | 78% | 3278 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 44,077 psi | 69% | 3186 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,916 psi | 66% | 3123 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 34,664 psi | 54% | 2989 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 49,980 psi | 78% | 3346 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 53,490 psi | 84% | 3350 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,214 psi | 82% | 3304 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,601 psi | 75% | 3245 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,262 psi | 62% | 3058 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 39,987 psi | 63% | 3091 fps | 95.1% |
| Lovex S071 | <<locked>> | 96% | 38,522 psi | 60% | 3074 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 51,996 psi | 81% | 3320 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,692 psi | 83% | 3323 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,066 psi | 75% | 3297 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 47,253 psi | 74% | 3294 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 42,757 psi | 67% | 3287 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 35,926 psi | 56% | 3041 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 48,646 psi | 76% | 3317 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 37,579 psi | 59% | 3091 fps | 95% |
| Ramshot Magnum | <<locked>> | 98% | 43,497 psi | 68% | 3241 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,224 psi | 43% | 2024 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,528 psi | 73% | 3232 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,924 psi | 83% | 3455 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,888 psi | 67% | 3287 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,911 psi | 56% | 3058 fps | 96% |
| ReloadSwiss RS 70 | 67 gr | 80% | 35,099 psi | 55% | 3061 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,414 psi | 77% | 3264 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,902 psi | 67% | 3173 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 94% | 51,430 psi | 81% | 3343 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 48,298 psi | 76% | 3337 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 82% | 43,047 psi | 67% | 3146 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,262 psi | 62% | 3058 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,490 psi | 84% | 3350 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,601 psi | 75% | 3245 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,987 psi | 63% | 3091 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,483 psi | 70% | 3238 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,982 psi | 81% | 3350 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,750 psi | 83% | 3251 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,512 psi | 70% | 3091 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,031 psi | 64% | 3054 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,863 psi | 75% | 3330 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 52,634 psi | 82% | 3248 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,482 psi | 68% | 3179 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 32,430 psi | 51% | 2986 fps | 98.4% |
| Somchem S385 | <<locked>> | 90% | 42,757 psi | 67% | 3176 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,345 psi | 84% | 3235 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,545 psi | 78% | 3228 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,922 psi | 78% | 3241 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,394 psi | 65% | 3094 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,405 psi | 59% | 3048 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 96% | 45,150 psi | 71% | 3215 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 48,428 psi | 76% | 3228 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,970 psi | 58% | 3045 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 32,401 psi | 51% | 2976 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 98% | 53,519 psi | 84% | 3497 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,869 psi | 58% | 3012 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 41,278 psi | 65% | 3179 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,804 psi | 44% | 2907 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,127 psi | 82% | 3356 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,907 psi | 77% | 3297 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 95 powders for 7 x 66 SE v. Hofe loaded with the .284 | 110gr | Barnes TTSX FB. Norma MRP delivers the highest muzzle velocity at 3,593 fps; across all powders the maximum-charge window runs from 2,208 fps to 3,593 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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, Hodgdon Superformance rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 110gr | Barnes TTSX FB 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.