I neck down, then run over 22 mandrel to push the brass to the outside surface of the neck. Next I neck turn to my tight neck chamber while taking a light cut into the shoulder. Seat the bullets long for rifling engagement !!!!! ****This step makes certain that your brass is actually backed up against your bolt face when you fire form**** !!!!!!!!
If you are getting rounds that fail to go bang, perhaps you are getting a weak primer strike due to case bumping forward in your chamber when firing pin drops.
So sorry for the late response.
I do neck down the full neck length. I figured I would let the chamber decide where and how features on the brass would form after firing that first time. Unfortunately, that first firing is basically lost effort activity for making cases.
Bobby also, when I make a dummy round to find out where Jam Length is, I always break down the bolt and remove the ejector pin and plunger. This is a "feel operation" so you dont wan't any back force on your bolt when searching for rifling land engagement. I like to set up dummy round where the bolt handle will free fall almost all the way to the bottom and stop about 1/8" short, meaning you must push down to fully close that last little bit.
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