The bushing is larger than a vent liner. They are .250" and either .300" or .250" long depending who is selling them. You could have your plug modified for a bushing but by the time you are done you would have spent as much or close. Just the bushing is $30 or more.
A new vent liner hex plug is cheap. Around $30 for a factory Savage plug. About $40 for a SS plug from Hankins and around $60 for a SS from Precision Rifle. The PR plugs seal the primer differently and would more than likely require a headspace adjustment.
If you go with the vent liner plug, i prefer the Lehigh vent liners. They last a little longer and the allen recess is a little deeper.
