Using the 40 brass WILL result in the case neck being to short. Do not use 40 cal brass.Yep, the pin may have slid up. I have a set of Hornady dies for the 9mm and if I get a stubborn primer the pin will slide up instead of snap off. Nice, but a pain sometimes if I happens close together. Glad it usually only happens very infrequently.....1 in 250. Usually some type of oddball brass that I got from range pickup. It then gets thrown in the scrap bucket.
Since we are talking .357 Sig I will throw out a question since The Joker is learning stuff about this caliber and I am trying also. I have heard that you can use .40 S&W brass and just resize them & I have heard they are too short to use. Which is it anyone? I have tons of .40 and someday might use them if possible.