Ive got a new .236 bore barrel. I tried to use my old brass but it didn't work. I got a shiny ring on the case head area. Next I bought some new brass, Lapua, and fire formed it. I use the false shoulder technique with the bullet .020 in the lands. .267 bushing for .002 nk tension. 29.5 varget w/ 108 Berger. Well the fire formed brass also has a shiny ring. Not as bright or shiny but it is there. If you resize it and reload it the ring gets a bit more definite and will catch your fingernail if you run it over it. Any ideas?