Gunsmithing Truing threads bad for prefit barrels?

[Boatninja]

Was told that after cleaning up the threads on a Remington action that Remage style barrels wouldn't work? Did I misunderstand or does someone have experience, opinion or thoughts on this?

 

[BadAccountant]

That is correct. Opening up the threads means that the prefit barrel you purchased will likely not fit if the thread tenon has been cut for a factory action internal thread diameter.

Most places will take 10 thousands or so to open up the threads. As a result, the tenon of the prefit will be too small.

You can also talk to the prefit manufacturer and ask if they can go with a bigger tenon, or alternatively, you can ship your action to them and they can fit a barrel for you.

There are other considerations, but most of the time, this is the case.

 

[...]

look around, because im pretty sure i recall someone making remage barrels with threads sized for "trued" 700 actions.

 

[Steel head]

Send your action to a good smith, they can measure it and provide prefits after that

 

[Boatninja]

Thank's to all for the Info. I have a Remington action .220 Swift with a Sinclair barrel that I suspect was built in the early "80s that I have been debating rebuilding. Trying to determine if/what might have been done to the action, not sure where to start. This may require a totally new thread.

 

[Wannashootit]

^^^
Relatively easy-peasy to figure out.
Pull the Sinclair barrel, and mike the thread OD.
1.0625 (1-1/16") is "standard". If it mikes substantially larger the receiver threads were recut oversize and replacement would need to be similar.

IMO slightly loose thread fit is fine- it's the receiver face and barrel shoulder being true that's most important. Too tight, isn't good either...