as an avid #4 303Brit guy i'm already setup to 'boilout' before regular cleaning . no corrosive ammo troubles here .
there is another way besides boiling out or harsh chemicals . its called 'grease cleaning' . most dont like it as it leaves the weapon in an un-useable state untill you wipe off the grease .
i didnt say cosmoline , i said grease .
basically , you dry brush what grime and residues you can out of the barrel and off the parts and then slather them all with lite grease . everywhere rust would form gets a coating . to use the weapon means wipeing out/off all the grease and a quick solvent swab in the bore to get it all out .
a grease coating cuts off the third leg of the rust triangle , preventing O2 from joining chloride salts in the company of moisture to oxidize steel.
when done right it actully takes less time than a complete normal cleaning after fireing corrosive priming . the grease penetrates right down threw the grime and lifts it out also . hit all the spots and dont forget the F-Pin , inside reciever and FSB/crown .
i sometimes slather up guns that have fired corrosive primers at some time in the past , that wont be used for a while , just to prevent :troll: suprises .
it works .