If you reload you can do what you want. You may have to remove .001 or 2 from the bottom of the die to get the clearance you need though. As for increasing the headspace, Since you reload you can raise the die and maintain the small shoulder clearance you want. Since you reload size the brass to fit your chamber.
Try not to overwork you brass.
If you neck size, after the first firing you will not have to push the shoulder back until you feel resistance closing the bolt.
If you full length size, Do not use a die that squeezes your neck down .012 then opens it back up .008 to get the right neck tension. find a product that gently reduces the neck and a button that brings you right back to the right tension.
If you notice that new brass sizes correctly but used brass does not, think about selling the brass and buying new or try annealing. Be careful with a do it yourself method or you will flash the zink out.
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