I shot my G23 two times with full power loads and ordered a KKM barrel. The Glock barrel scared the pee out of me. No smiley brass with the KKM. I can use a Lee 40 S&W carbide die to resize brass, fired in a Glock barrel, enough to use in the KKM. The KKM is so tight that fired brass will drop in a case gage without resizing. The final step is the Lee Factory Crimp and all is well.