What you guys think about J&T?

[Turtlebuck]

I recently bought a J&T upper 6.5 Grendel 20". I only managed to find Hornady 123 g amax in the area. The ammo gets jammed in the barrel. The bolt won't close completely. I have to pull the charging handle forcefully to extract the bullet. I've contacted j&t and they advised me to use Wolf ammunition, because Hornady hasn't been producing the correct specs for the Grendel. I also contacted Hornady, who advised me their ammunition was not the problem and to maybe run a reamer through the barrel.

I need advise what to do, buy different ammo and pray it works and never use Hornady or take it to a gunsmith and have it reamed?

Or any other advise?