I had an expensive and possibly dangerous problem with the neck diameter on 17 HH brass. I had a reamer built after measuring 25 rounds of factory loaded brass for two dimensions: Loaded round neck diameter, and headspace. The Loaded Round Neck Diameter only varied .0002" and the headspace only varied .0009". That is, of course, remarkably consistent. The reamer was specked to this brass and had a .196" neck diameter to fit a loaded round neck diameter of .193". The next box of ammo I bought had a loaded round neck diameter of .198!! If I had fired this ammo in my new rifle, I would have had a neck crush fit of - .002" Hornady, this is dangerous, and my newly chambered rifle is useless. I am speechless that a great company such as yours would create such a dangerous condition in your ammo!!