mauser, that bore looks like my 1929 Husky 9.3x57 after 5 or 40 rounds. One night's soaking in wipe-out and it's virtually clear.

I first used the wipeout in it late last summer, and then again in the fall. Before that, I'd just used a normal cleaning with butches, which barely touched the very heavy copper fouling.

It took 2 days soaking with wipe-out to get it clean the first time - right back to black steel-no copper. Now, after a range session, it only takes one soak - overnight, just like any other rifle. My bore is reasonable, listed as good, not excellent, yet it fouls no more than most factory barrels of rifles today.