Always swab your bore out before your initial loading, always.
People use a variety of things in their bore for storage, I don't know how mink oil stacks up, there are better things. I use 30W motor oil, have used Balistol, 3 in 1 oil, Rig gun grease, Barricade and others. The only lube I used that failed terribly was Remington gun oil, I found I had rusting and pitting in the only M/L I owned at the time after I used it.