threaded barrels

Just picked up a Hells’s Canyon in a 300wsm. When I got home I tried to replace the muzzle break with a Silencer Co ASR for one of my cans and it didn’t fit. I assumed it would be a 5/8x24 thread pitch but I was wrong. Does anyone know what the thread pitch is on this rifle so I can get the...

Well after much frustration with removing my muzzle brake I cut it off today only to find it was reverse thread and soldered at end. I would have never thought that would be possible, but now the bigger question is how do I fix it? I want a removable brake