ASAP after firing corrosibe primed ammunition,GI bore cleaner works well, as I suspect other mixes mentioned would too.
At home, try this. Run HOT WATER through the bore, from the chamber, BOILING WATER IF POSSIBLE. This will disolve any salt residue. Then clean as usual.
By the bye, is the barrel of your rifle crome lined? Some were, chamber too, which would prevent salt corrosion.