I was thinking your brass was getting hard and needed annealing. Do you have a bushing die? I'm using a bushing die to resize and a hornady seating die.
NYDAN looking at your pictures I see cooper shavings. Your bullets may not be starting straight. Try putting more chamfer in the case or switch to a vld chamfer tool. I load a lot of 140gn eld-m bullets in my 6.5 prc. https://www.amazon.com/RCBS-9351-VLD-Debur-Tool/dp/B000LC7LQ8
PV has remington lr primers on sale. https://www.powdervalley.com/product/9-1-2-large-rifle-remington-primer/?utm_source=Klaviyo&utm_medium=email&utm_campaign=Weekly%20Deals&_kx=9yZTKUZn57Ugfw5XB9qJqonVrFs9aiqJX8qse4MhGzQ.SeB582