One important thing here for you. You live in a climate that is a bit more humid. When you shoot "corrosive" ammunition in ANY rifle, as soon as you can run two pints of boiling water down the barrel from the breech end. If you do not, IT WILL RUST on you.
"Corrosive" refers to the primer compound. It usually has a chemical composition using a "salt" that ends up in the bore when a round is fired. The hot water washes and flushes this salt out of the bore, and hot water will heat up the steel barrel. This opens up the pores in the steel, and promotes drying. FLUSH --CLEAN -- LIGHTLY OIL the barrel as SOON AS POSSIBLE after firing. This is especially true in a Costal environment.
A lot of older shooters used to carry a small bottle of water and a modified funnel with them, and dumped the water down the barrel before leaving the range. ANY flushing, as soon as possible, even if the water is cold, is better than none.
Find a small METAL funnel, and sort of "flatten" one side of it so that it is straight on the one side. Solder a small piece of 1/4 inch COPPER tubing onto the end of the funnel. Then bend the tubing into a bit of a "S" shape so that it enters the chamber of the barrel. Point the muzzle down, pour in the boiling water, then clean and oil.
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