Might be worth getting an alignment rod, or checking if anyone local has one.
Giessele makes them for about $75, there are some others out there for less. CNCWarior has them around $30. There are some carbon fiber ones out there.
McMaster-carr tool/drill rod for about $12 per 36"
I highly discourage placing a washer of any fashion between the barrel shoulder and suppressor. Washers are not even closely precision made.Take it apart and inspect. Sure sounds like baffle strikes to me. Another thing you might try is to put a washer between the suppressor and the barrel. Could be a timing thing.
That is kind of a thin barrel for hanging a can.They measure the same as another rifle done by the same smith
Barrel measures .720 at the muzzle.
Can stays tight against the shoulder.
Could be the threads but I don’t think so??
I’m very stumped by this.
I just shot it again and all 5 shots were on the paper but this time 5” low and left. Shot about a 5” group.