Last year I loaded about 6 boxes of 270 ammo that I've had since the 70-80"s. I cleaned all but one box cause it didn't show any signs of corrosion, that is until yesterday. I checked all the boxes and the only one that didn't have any corrosion, now had small spots of corrosion. I don't have any loading dies for the .270 cause I didn't plan on shooting it again, it will be left to one of my sons and they can shoot it. Today I took the whole box of 20 and took them apart to clean them and of course I didn't have the right puller in my kit so I used my kenitic puller, worked well. I kept the bullets and powder. I chucked the neck into my drill press and used red Scotchbrite pad, then 000 steel wool and then treated them with NEVER DULL Polish when they were spinning on the lowest setting my drill press will allow, they shine like diamonds. Now all I have to do is borrow my friends 270 Win dies and reload them. The corrosion was just small spots of green but being a perfectionist and I didn't like them that way. The ones I cleaned last year were twice as bad as these and they are still gleaming. This is the easy way to clean. Last year I stuck the empties in my RCBS vibrator cleaner with Walnut and then corn cob media for about 4 hours each and it didn't clean the corrosion but the scotch brite sure does and then smooth everything out using 000 or better steel wool and polish with Never Dull. They are gleaming. Something to do on a Rainy Day in Nor Cal.