Reloading .303 British : Reloading 303 with crimp

I purposely messed up the neck and mouth on one of my once fired Hornady cases. I have a .310" neck expander and I adjusted it to unnecessarily flare out the mouth of the case. I then full length resized it using my RCBS XL14 resizing die that has a .310" expander ball. I took a .311" 174grn FMJ-BT and seated it just to the bottom of the cannelure. The neck tension is as it should be. The main focus here is the inside diameter of the case neck @ .310". The .311" diameter projectile when seated, has enough neck tension placed on it to firmly hold the projectile in place, even after the case was purposely mistreated.       It is of my personal opinion that your Lee full length resizing die was machined out of specification...