Thread: Full Length or Neck sizing. What is better and why?

Ideally you want to full length size your case just enough so it has the minimum necessary clearance in the chamber. This means every round is the same, as cases are always sized back to the same dimensions. Brass is worked as little as possible so lasts as long as it ever will.

However because all dies and chambers are made within a range of dimensions (SAMMI min-max) getting the perfect die fit can be hard. Sometimes with the correct shoulder bump your die might not even size the base of the case, leading to issues with chamber fit.

Personally I use a full length die and set it up so my bolt can just close with no resistance. (I think it's Alex Wheeler's YouTube video I watched.)