Ruger American Rifle .308 22” barrel 1 in 10 in twist.

Don't have a 308, but my adult son has a 6.5 cm Ruger American and I have a 243 Ruger American for a truck gun, both are very accurate for inexpensive rifles. I've never shot factory loads through mine, but my son's shot slow with factory ammo, so I worked up a load for him with 120g BT'S. Good velocity and very accurate. I wouldn't have believed this was 200 yards had I not been watching through my spotting scope.
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That’s outstanding!
I’ve heard from friends and have seen similar results from StaBall powder, especially in the compact and highly efficient cases like the 6.5CM and hopefully the .308 as well.