Dont have your answer,
I have the larger diameter brake in my hand now, but I also have a 300rum with the smaller diameter that is probably the same as your 308. However, I just removed and replaced it and did not identify the treads at the time. So Savage has at least 2 different thread for their muzzlebrakes.
the larger one is 5/8-28, I think the smaller one is 9/16-??
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