Hi All.
I have a Smith & Wesson 22-4 (new 2007 'vintage' model of 1950) chambered in 45ACP. I have 100 Auto Rim cases that I loaded with the 452423 boolits and 4.2gr of 700X. When shooting ACP cases with full moon clips I've never had any problems, but when I shot the auto rim cases out of 100 I had 7 of them split from the neck 3/4 of the way down the case. This was with Starline brass on their FIRST firing! Does anyone have any ideas on why this happened?