new 416 rigby custom on a satterlee action and pacnor barrel. Do I need full sizing dies or neck dies and why??

You will definitely need a full length (FL) sizing die, the neck sizing die is optional.

I'm saying this assuming you want to use the rifle to hunt dangerous game. For that application, you want your rounds to chamber without any problems, and in that case FL sizing is what you want.

For shooting on the range, you can neck size, if that takes your fancy.

- mike

mho thanks, someone had said only a neck resizing for big bore rounds?? I load several other calibers and up to 340 wtb with all fl resize dies so the neck only for big bore suggestion was questionable