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GWS, if you use a drill press to hold the hone (or whatever you use) as it spins and goes in a die's neck, the result will be a bit off of perfect and the neck may well be egg shaped as well as lop sided; expecially if you hand hold the die. The die needs to be held very rigid and turned on its center so the hone will center perfectly in the die's neck.
Rifle barrel blanks are turned so the drill held stationary centers in its mass as it drills the deep hole in that solid round bar of steel. Then they're finished reamed to bore diameter while they're turned and the fixed reamer gets pushed gently through its full length.
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