Head space gauges don't lie but it is possible to use them incorrectly. The rim of the gauge must be under the extractor and preferably the ejector & spring removed. It sounds like your brass is VERY short from datum to base. If you re-chamber a fired round does the bolt close with no resistance? If so, you aren't fully fire formed yet and resizing or moving the shoulder back only adds to the problem. Get yourself a Headspace comparator insert for your Hornady tool. Use it to 1st measure your go-gauge then measure virgin brass then measure and compare to fired brass. Your goal is to match the H/S of Fired brass to the H/S of your Go-gauge..... Until that happens neck size only. I have a H/S insert & an LCD for every cartridge I reload and my brass lasts forever if I don't load overly hot. Just another angle for you're consideration :) BTW the "tight spot" in your throat will probably go away after a 100 rounds or so maybe sooner. A little JB's & Kroil will help polish away any burrs on leade or throat entrance.
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