I'm shooting a old Husqvarna hammer shotgun for ducks.
If I fire the gun I get a layer of rust about 2-3 inches long in front of the chamber mainly in the right barrel,it appears overnight and does not extend down the barrel any farther it is quite heavy making those couple of inches appear black. Load is RIO or Cheddite primer, BP HCD-21 wad, ITX shot completely contained in the shotcup and PB powder.
It does this with as little as one round, youd think I was shooting Black Powder as heavy as the rust is.
Any thoughts. I'll try and post a picture.
