Interesting. Yesterday I cleaned my sons Winchester 243. It’s an older one perhaps early 80’s maybe 70’s. I bought it with a Japanese tasco for 250 bucks several years ago. Gun has seen some rounds and use. Decided to really clean the barrel. About 3 days of soaking and re soaking. Then a jb clean. The borescope showed me pretty heavy X tooling marks in the shoulder area. Brass comes out fine and the gun shot 3/4 moa nice and triangular groups when I zeroed it a couple years ago with a load I had for another 243. I was very happy with that.
