I sized a bunch of cases my nephew gave me that he had shot out of his Remington. I was setting up my seating dies and I decided to make a dummy round because I have read in some reloading books that it aids in setting dies if they get out of adjustment. I also wanted to see if I wanted to crimp or not and how tight the bullet fit into the case with just a sized neck. I seated the bullet to the same length as my factory Federal rounds with the neck at the ring on the bullet. I then put it in my Savage to see how it fit. It went in fine until I went to turn down the bolt and then it got tight. I pulled it out and checked every possible measurement with my caliper. They were all very close if not exactly the same. The only thing I could find different between the cases was the neck. On the ones I had from the factory and the ones I had shot in my Savage had a good sharp turn at the shoulder. On the cases I got from my nephew, the shoulder had a more rounded shoulder.
My questions are has anyone seen this before? Is there something I should be concerned with? And if I shot these out of my rifle, will they form to my chamber? Any advice would be appreciated.