Which muzzle brake for .587" barrel

[884runner]

Having a hard time finding a brake for my savage 16 .308 stainless
I measured the barrel with a cliper and it was .587"
I am guessing I need a 1/2"x? thread pitch.
It seems most .308 brakes are 5/8"
Any help would be great.

[884runner]

Anyone? i can't seem to find a brake for a 1/2" .308 barrel.