You either didn't bump the shoulder back enough, or your bullets are hitting the lands.
Same thoughts
If he's hitting the lands, and unable to close the bolt, wouldn't that indicate some serious neck tension?
Maybe it's the neck tension. The OP needs to pull the bullets and full length resize since he said he only neck sized. Like others said, I think he needs to bump the shoulder back. Or lube them up good and run them through a body die. Keep in mind you will be playing with loaded ammo. Pull the bullets and full length resize. Using a Hornady case comparater has been a real eye opener for me.
kwg
