Being close to the ocean, nickeled brass is a popular choice here for some as it is less prone to corrosion than unplated brass. One problem you might encounter with nickeled brass is having sufficient case neck tension on the bullet, often you can turn the seated bullet between your thumb and finger. If this proves to be a problem with your dies there are a couple of solutions. You can choose a smaller expander button or or polish the one you have until the bullets snug up in the case neck. You could choose a smaller bushing if you use a bushing die But the simplest solution is to simply crimp your loads, with just enough crimp to snug up the bullet in the case neck.