One thing that has not been mentioned here is the rifle barrels contour. If you have lets say a typical sporter style barrel which will be light in weight (as opposed to say a Varmint or Bull barrel) this barrel muzzle end may be large enough to accept threading. In order to turn lets say a 5/8" X 24 T.P.I. you must turn said barrels O.D. to a dimension of .625" x .5OO" In length. What do you do if your barrels OD is too small. Well you really only have 3 options with this barrel.I may get a suppressor in 2020, and I have a couple Savage rifles (models 10 & 11) without threaded barrels. What should I do with these guns? None of them are collectors' items, but they shoot well as is.
Noooooooo! Sorry, I thought we were still in the other thread. OP, leave the barrel on the action to thread and there is no need to rechamber. You aren't cutting corners by leaving it alone and simply threading for a muzzle device.If you plan to thread the muzzles, I'd go for the whole nine yards and cut a new chamber into each of your two rifles. The barrels will need to be removed to thread them, so why not rechamber and have what essentially amounts to a brand-new gun?
It seems that the US is limited with only 1/2-28 thread and 5/8-24 mostly which severely restrict options of threadings when foreign manufacturers can have up to 15 or so options of Threadings available.
Now days with the cnc machining of parts , any brake or suppressor could be supplied with way more threading options. It is really up to the manufacturers to sit down and establish a few more options for the general public. A good thread should remove just enough meat to establish a good shoulder but not remove too much material as to look ridiculously thin. As an exemple , I have threaded recently a savage rifle in 300wm to the install a brake with a muzzle diameter of about 15mm. The thread was M14x1 which leaves about 2.51mm of wall thickness between bottom of the thread and inside of the bore .
with metric threads, are all the same tools used?The same threading tool cuts all those threads.
Shep