You dont,read the posts,this guy is ata beginner stage, and has brass,sounds like barely fit chamber or not. I have neck dies,bushing dies,full,etc.I load as you suggested,and have tools to measure. I dont believe OP,HAS THIS KNOWLEDGE. When the press does not have a positive stop,usually the sizing accuracy is off some,or more or less lube, speed of press stroke.If you check every case you know this and it is hard to get consistent,That is why they make a shell holder kit with varing thickness bases for that purpose.The press flex is not as repeatable , as when taken to a positive stop.The brass varies as you can feel the difference when sizing.