I absolutely trust it for .308 load. For my precision loads I always double check with a beam scale and they are 99% of the time within .1 grain and never worse than that. I wont use the load unless it is less than .1 grain. Between gifts and buying them I ended up with 3. I only need 1.
I will take the Hornady Concentricity Tool. I will be at Escambia River Gun Club all day today at Project Appleseed, but I'll be around all day tomorrow. I live in Pace.