For lead bullets to wear the rifling out physics would have to be ignored. That is like saying that the butter is going to wear out the knife if you use it to often
Lead is several orders of magnitude softer than barrel steel, plain and simple. You cannot even express the hardness of the two on the same scale of hardness for aplles to apples comparison.
chaim, lead bullets are never ever gonna wear your barrel AT ALL unless the lead is contaminated with something harder than barrel steel (RC 40 or so). The flame cutting associated with all loads will be present, but that is all of the wear that will take place.
Lead is several orders of magnitude softer than barrel steel, plain and simple. You cannot even express the hardness of the two on the same scale of hardness for aplles to apples comparison.
chaim, lead bullets are never ever gonna wear your barrel AT ALL unless the lead is contaminated with something harder than barrel steel (RC 40 or so). The flame cutting associated with all loads will be present, but that is all of the wear that will take place.