07-23-2023, 08:58 PM
If I read this correctly the fired case will chamber before you resize it but not after? Have you measured the overall length of the case after firing and then after resizing? The loading die causing the case to lengthen "Expander ball as the case is extracted from the die" is the only thing I can think of where then trimming the case cures the issue. Again easy to check with a set of calipers. If the case is longer after resizing remove the expander ball and see if there is any difference. At least then you will know what is causing the issue.