I know you're looking to do a custom build and prefer a carbon barrel, but I'll offer my experience. I've guided sheep hunts in So Cal for the last 20 years and drew a tag myself 3 years ago, and bought a Kimber Montana in 6.5 CM, put a VX3 3.5-10 with Talley mounts. It comes in around 6.7 lbs total. After doing the obligatory accurizing and load development it's consistently sub .75" I shot my ram at 480 yards with 127 LRX. The rifle works great for me and left money in the bank for scouting trips.