I am shooting the 90 grain Swift Scirocco II out of my ultralight 6BR sheep rifle.
It's built on a modified Remington 600 action, with a 22" 1-10" Shilen barrel.
On top is a Ultralight Leupold 3-9X.
The Sciroccos are awesome in this rifle, with it's pencil barrel.
I'm chasing them with around 30 grains of RL 15 [2990 fps], and the first three are always right around 3/8 - 1/2" at 100.
Eagleye.