Barrels are fine. My experience with a 280AI has been very disappointing. I have several custom rigs from up and down the pricing scale. From a Jarrett Rifles .300 Jarrett to a local gunsmith that made me a Frankenstein monster in 6.5 CM.
For the amount I spent I should have better than a 1.5 MOA. Contacted them twice. Nothing other than some reloading advice. (In my 42nd year of reloading)…nothing new on the advice.
In the interim bought a Fierce 270wsm and a Sako S20 6.5 prc. Happy to say both are 1/2" or better.
That has been my experience. I hope yours is better.