I have loaded 20 rounds but have not fired them yet. I am using cci #34 primers. I have the rcbs hand priming tool. I squeezed the tool all the way when I seated the primers. They are deep so i have no worry of a slamfire. But, can they be too deep so they won't fire? I am just hoping I don't go to the range and I have 20 rounds that won't fire. Any insight would be helpful.