I have around 50 Hornady .223 cases that are nickle plated. I only FL resized them once. They went in and out just like the rest of them did. I neck sized them after that. So far I have fired them 15 times with no splits. I am gonna scrap them due to the primer pockets getting looser. I hate to toss brass, though after a primer blow out two weeks ago I will error on the side of caution now. The shipping on the replacement firing pin, and a spare cost more than the darn parts did.