in my 223 load I originally started out using federal primers and one day I was out looking for primers and couldnt find any federals so I went with CCI and my groups went from 1 inch on average to under 1 inch just by using a different primer. I dont know what that guys deal was other than he was just another blow hard which you seem to run into alot in the world of reloading. I wouldnt worry about anything he said.