My current rig is a tactical 7WSM that I have modified only slightly - I bought a dedicated long-throated F-Class barrel - to shoot F-Class open. It based on a Surgeon SA using a McMillan Baker Special Stock with KMW cheek hardware, uses Badger Bottom Metal and AI Magazines (a 5 round .308 mag holds 3 7WSM and a 10 round mag holds 7 7WSM. In its tatcial configuration it runs a 26" barrel with a Op Inc Break and runs smoothly from the magazine running either Sierra 175s or Berger 180s seated to OAL of 2.90." In its F-Class configuration it runs a 28" barrel with NO break that has been long-throated to run the Berger 180s at 3.12", but must be single fed. Both barrels are AMU/MTU contour, so teh 28" barrel runs about 1.0 -1.5 pounds heavier. The Galss is OS Optics 5-25X with the PCMOA reticle, for ranging and ease of holding off when shooting.
This picture is of the 26" barrel before I got the 28" - you can see the thread cap on the front of the barrel where I have removed the break and installed the thread protector.
She ran just fine using short-throated ammo in F-Class Open.