Originally Posted by duster
It would seem that switch-barrel rifles excuding the Savage would have special headspace requirements due to barrel thread wear, barrel shoulder wear, recoil lug wear etc.
Of course wear can be reduced with anti-sieze compounds and other lubricants, but sooner or later a rifle set up with minimum headspace is going to have a problem chambering cartridges.
Is the answer to chamber on the loose side, or have the chamber cut a little deeper when necessary, or is some other generally accepted way this is handled?
I am by no means an expert on this subject but I do believe it is not a good pratice
to switch barrels with out headspacing every time because there will be a change
in headspace at some point.
If you make up a barrel to an action with a set torque and match mark the two then remove
it and re torque it at the same torque it will go past the match mark by a small ammount.IT may
only reduce head space a small amount (.0001) but over time it will be enough to require
touching the chamber with a reamer to bring the head space back to the origanal specs.
I see no real advantage in switching barrels on any rifle because of the work required to do so
and the cost of re zeroing and possible accuracy changes buy changing headspace and scope
position every time you switch.
If you need another caliber then build another complete rifle for very little more.
And to answer your question- If you start with a head space around .003 you can probably
get away with a few switches but brass and accuracy will suffer from the excessive headspace
untill it reaches around ,001.
Each barrel of a different caliber even if they are the same contour will have different harmonics
and the scope/sights will have to be changed every time you switch barrels.
I know that some will not agree but thats what makes the world go around.
J E CUSTOM