Alex Wheeler
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Some brass gets thicker towards the shoulder. Id guess thats why the tapered neck exists. It doesnt bother me either way. If I am specing a no turn reamer and it has a tapered neck I leave it. It keeps that part of the reamer cutting/supported as well. Thats a good thing especially in a 5r. I have even tapered freebores. Keep in mind, your straight necks all end up tapered as the reamer wears.