Originally Posted by 338winmag
Could someone explain in fine detail what this "donut" approach actually. I thought from past threads, you don't want a donut?
What I call the donut is the last part of the neck against the shoulder that has "Not" been sized
and remains the size of the neck chamber after fire forming.
In other words If the neck is .300 thousandths long you would size only .280 to .290 and leave
10 to 20 thousandths UN sized .
What this does is to assure that the neck is centered to the bore after sizing when chambered.
J E CUSTOM