Ok, so I can't seem to resist these subsonic cartridges. I'm currently working on putting together a bolt gun and trying to decide on what case to form my 8.6 cases. I know Kevin originally designed it to be formed from Creedmoor brass but, a customer, that bought Redding 8.6 dies from us, advises that neck splits are the norm(from one fired hornady cases) . So, my thoughts are maybe 338 federal will be a better starting point, thus my post. I'm looking for a half dozen cases to prove 338 federal is a better starting point, or not. Anyone that has a half dozen cases that's willing to sell to me, please pm me so I have something to try. I greatly appreciate any responses!