Thread: Found this very interesting.

Just in case its helpful too someone.

It seems copper projectiles dont like ben shot in barrels that have been using jacketed projectiles.

https://www.youtube.com/watch?v=ULVKvt1MCpg

Yes, I have found that to generally be true.
In my case with Barnes TSX and TTSX bullets. Can't speak for other mono-metals.

Very educational, I like that he actually went out and tested the theory too.

That horizontal stringing is typical of a fouled barrel that needs cleaning. My howa 308 used to do it if I didn't strip the copper out every now and then. That was one rifle that hated being dirty.