Thanks for the welcome,good to be here! Both my 40 and 46 do copper foul on the lands and recovered fragments of jackets show the plating pretty much removed at those points.I was just concerned because barrel replacement is a costly item , even if you bore out the original stub to preserve the cam ...

I am the very happy owner of 2 K-31's, a 1940 and a 1946,and I am curious about bore life and the effects of plated steel jackets( GP-11 and much to my surprise, Norma ammunition) on the bore.The mild chamber pressures of the 7.5mm cartridge would tend to give long barrel life but I wonder about the...