I am reloading a bunch of once fired brass that came out of my buddies rifle. The primers seem to be going in much more easily than with other brass. The variables are: 1. This is nickel plated, I have only reloaded straight brass before. 2. I lightly uniformed the bottom of the pockets but I don't think I was removing hardly any metal. 3. It is Federal brass. Never used it until now. I don't know how little pressure is too little and it seems every time I figure something out I run into another problem. What should I do? Is the nickel just smoother which makes a primer slide in easier? If a primer is a little loose but certainly snug, is there any risk of firing it? I don't want to discard 120 pieces of once fired unless I have to. Thanks for the advice.