It's a myth... rebated base, boat tail, and flat base, "erode", all the same, which is just about nothing.
It is flame from the burning powder that eats up the throat.
If powder could erode through the different bases, barrel wear would terrible at about 8" in front of the chamber.
Spring has sprung, da' creek has riz, I wonder where dem kitties is? Here, kitty kitty kitty.
LRH member #23