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Old March 26, 2011, 06:55 PM   #4
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,013
Well, actually, Mausers and other 10 TPI barrel thread actions, the Springfield included, have been made into switch-barrel guns in the past. In these, a shallow blind hole is put in the barrel at 6:00 near the action end for the tooth of a spanner wrench. That wrench is used to tighten the barrel by hand until it finds a registration mark the smith also puts into the barrel and receiver. If the gun has both a right-hand twist barrel and right-hand barrel thread, the tendency is for rotational acceleration of the bullet to screw it in, rather than out, so it tends to stay. You may, however, have to fire a number of rounds for it to settle as much as it's going to. Such a barrel's threads are more free to vibrate up and down in the action, which is a problem, so the accuracy potential is usually limited to "hunting accuracy", meaning for medium game size kill zones and up.

If your sight was straight up and down with the barrel hand tight in the receiver, you need to take the barrel to someone who works on Garands and M14's who is accustomed to fitting an out of time loose barrel. The standard technique is to center the OD of the barrel shoulder in a 4-jaw chuck on the lathe and use a roller tool bit to raise a lip on the shoulder that will offer enough crush resistance to let you bring it back tight into the receiver with a barrel vice and action wrench. That will restore the fit without affecting the headspace.

If that's impossible because the headspace is too long when the front sight is at 12:00, the other standard technique would be set the shoulder back and extend and re-time the thread and rechamber to correct headspace. You then wind up with a slightly shorter barrel but a good fit. Before going to the expense, though, you want to know if the barrel is worth saving, since the labor is likely going to equal the price of a lower end replacement barrel anyway. If the barrel doesn't look great in a bore scope, you're better off to have a replacement barrel installed.
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