The twist rate is 1:7.5.
The gun is set up for 162s up to 180s, and heavier if preferred.
Barrel is Kreiger or Bartlein, but I can't remember. I'll have to ask the gunsmith who built it for me.
I had it set up for the heavier grain 7 mm bullets as my intention was to take it and use it as my elk and other large game gun.
With the twist rate and the OAL of 25.5, it can stabilize the heavier bullets very well.