I've had problems getting the 64 BSB to group in .223, .22-204 and .22-250.
SPS recently offered blem factory .22-250, 64 BSB ammo. I ordered a box just to see how Nosler factory BSB ammo shoots. I see they're now sold out of that item.
My .22-250 has an 8 twist Shilen barrel.
Terminal performance is reportedly great with that bullet.
DF