Try another shell holder! Have seen some brass not line up just right. Have run into issues with 40 s&w brass, set all the way in holder and primer would deform at times. Slip it in and hold on to it as you seat primer and you can feel sweet spot to seat them.
Brayden (Lazy L's Southern Comfort) you will be missed! You were more than a pet you were my reason to rise and return for many days! You were my rock!