Thanks for the advice. I'll go through the steps of lowering the sizing die by small increments to see if that makes a difference. I also have some factory ammo on the way to see how it seats. It's cheap wolf ammo, but it should be sized correctly.
I've also thought about just buying a new barrel and replacing this one and chalk it up to a learning experience. I got this lower at a low enough price that the cost of adding a quality barrel will end up costing what a higher quality complete upper would have cost in the beginning. I'm still mulling that one over and it will be the last resort if I can't solve the problem my resizing and if the seller doesn't offer a satisfactory solution.
I've also thought about just buying a new barrel and replacing this one and chalk it up to a learning experience. I got this lower at a low enough price that the cost of adding a quality barrel will end up costing what a higher quality complete upper would have cost in the beginning. I'm still mulling that one over and it will be the last resort if I can't solve the problem my resizing and if the seller doesn't offer a satisfactory solution.