Im currently working on a project by necking the 505 down to .338 cal. I'm wondering what twists your longrange guns have, bbl length and the speeds you run with the Sierra 300gr bullets. I want to compute the twist i will need for this bullet, the new case should be capable of launching the bullet at speeds over 3500fps. I need to have a twist that will not over spin the bullet so it will stabilize out at 1000yds or farther. I have a pic of the formed case if any one wants to see it i can email it to you. It most likely will have a 35deg shoulder. DC did a workup on the wildcat and it looks very promising!!