barrel threading

I've got a 300 win mag that I am looking to re-barrel. I would like to go with a Shilen or a Shaw varmint barrel. I would also like to have the muzzle threaded so that I can add a muzzle break (my shoulder is not what it used to be). I see on the shaw website that they will thread a 10/22 muzzle but don't see anything about the savage ones... so the question is, if I ask nicely will Shilen or Shaw thread a muzzle on a barrel before shipping it to me?

no clue here. I would call and ask.

Get your new barrel installed on your action. Mark TDC at the muzzle, then send it to Ross Schuler for a brake and install.

He provides the best brakes and service for the money bar none.