I think what you're seeing in mine is due to lack of depth of field with the lens and a not so steady hand at 1/60th sec. Using a macro(60mm f2.8) at f8(I think it was) doesn't show all the detail but blurs it somewhat. It ain't perfect but a sight better than it was.Use to I couldn't get six rounds through it without apparent lead in the cone and for about half an inch into the rifling. Throats are .358" and I used both .358 and .359" bullets-nothing helped until it was cleaned up a bit.