All I use is my girlfriends barrel as she has a 40-9 conversion barrel which is very tight. If it fits in that barrel it fits in every other 9mm gun barrel in the house. If it doesn't fit in that barrel they still typically fit in every other gun in the house. I found that using the lee factory crimp die does a much better job than that Dillon die could ever do. If you're still using the Dillon die then you're going to have a bad time.