Starting to reload 9mm. I am using 5.0gr. unique. 115gr. Hornady xtp, My OAL is 1.140. w/ a taper crimp. This is for a Springfield Armory XD-9sc. I loaded 5 rounds in magazine to check for feeding issues. I locked the slide back, inserted magazine and released the slide with the slide release. I did this with all 5 rounds and repeated twice. I then rechecked oal and it is now between 1.135 and 1.138. Should this be a concern? Do I need to taper more? Should I change my oal to 1.135? Reloading for practice ammo. Will be using factory SD loads for carry. Thanks for your help.