Well I finally got the cases for my 400 PDK formed this weekend. This wildcat started as a blownout 280. While I was able to stretch 280 brass up to 411 I elected to go with 06 cylinder brass the longer neck and the shorter 411 300gr bullet allowed me to seat the bullet at the base of the neck and still match the canalure. This case is formed but not resized so the neck is a little larger. Measurements are .46" shoulder .438" neck this gives me .022" of shoulder. Or basically the same as a belt. The shoulder is plenty to keep me from chambering a long case. Gross capacity is 86grs of water.Which is 14% more than the 400 Whelen.