Brass deformation???

[G.T.]

I'm going to try the ground radius theory and see if it works out the same.. it would then be something anyone could do with a Dremel and a small stone mounted point???... .... I appreciate your contributions Dave, keep firing away! ... best to all, til...lat'r....GT

BTW, I'm also going to radius the top of the slot in the receiver where the breech block runs, just at the area of the point of ejection? Might eliminate all, as I think it sharp dents prior to scuffing ??... GT...