Re-barrel Luger Shooter

[sheepherder]

Originally Posted by 4 Scale

I have also been surprised at how accurate a poor bore can be, but believe it can be explained. My theory is, poor bores are caused by use (wear) and corrosion.

I invite challenges or corrections to this theory.

I offer neither. I do offer more information...

A Luger typically is marked with an 8,82mm [.347"] designation. That is a land dimension. A 9mm bullet is .355" diameter. That gives roughly a .004" - .005" depth of rifling groove. It would be reasonable to assume that the land would wear more rapidly than the groove (it is subjected to pressure/friction more than the groove). So the land can wear significantly more without affecting gyroscopic stability or velocity. Which equals accuracy.

...In theory...

To put this in perspective for non-machinists, a sheet of ruled notebook paper is .004" thick. I use pieces of notebook paper for my metalworking.