Very cool setup. I want to do something similar in .280AI, but with a 24" carbon fiber barrel. Someone stands to get a nice setup with this. Which mags are you running with the HNT26 and the .280AI?
Only benefit to a carbon fiber barrel is a lighter wallet. Velocity will likely change less than 100fps (about 3% less) from 24"-20" barrel. I used 300wm. mags.