I am changing out brass for my 300RUM. I have tried to use Nosler brass, but am getting high pressures with most all of my loads, no matter what charge. I took the gun to the gunsmith, and everything is to spec. So, I am changing brass to see if that is the problem. I have a bunch of nickel plated Remington brass, and some regular Remington brass as well. Is the nickel stuff thicker than the regular brass? Also, I have not used nickel plated stuff. I remember reading something about it long ago, but forgot. Any tricks to using it?