I'm new to handloading. My first 500 rounds, I used new Starline brass. I just cleaned up 500 rounds of once-fired Fiocchi brass, and when attempting to seat my first primer, noticed some difficulty, to the extent I am scared of forcing it and causing it to explode. I've tried several with the same result. I measured the width of the primer pocket, and the Fiocchi pockets are .248-.249, whereas the Starline pockets are .251 - .252. I'm using CCI primers. What next ? Are there some primers that anyone knows work fine with the Fiocchi pockets ?