Dakor, the 156 cauterucio bullets are hand made by Bob Cauterucio. They are great bullets. The BC is 615.
His 176 have a bc of .750 but Bob says a 7 or 8 twist is needed to stabilize them. Some folks here think a 9 twist would work but with a 10 twist I'd try the 156's. If you didn't build the rifle yet then go with the 9 twist. If your shooting inside of 1000 yards the 156's will be fine. I tried 140's in my 7STW, they where too fast. Slow'em down and increase accuracy.
Like I told Bigbore, don't be a velocity freak. Brett Farve doesn't throw a 60 yard bullets pass does he?
Bigbore, glad you are going with those heavier BC bullets.