Last night I was fighting with the gas checks fitting on the bullets. I found a fix that may have been found before but is new to me. I put my collet bullet puller in my powder measure stand from the bottom upside down adjusted and crimped the gas check stem to allow an easy and non frustrating gas check install before sizing. My fingers enjoyed it the most. So then I played with Plain base bullets and was able to make them accept a check. I used a piece of plastic round rod to set depth. Maybe some of you can use this.