I have a Gen 4 20 I just bought and I have a Lone Wolf barrel in my 21SF. It's ok, but I had to have the chamber opened, by them, to shoot my cast loads. For my new Gen 4 20, I'm wanting to get a 6" non-ported ss barrel soon. I will be shooting cast and hot jacketed rounds in this barrel. Who has the best barrel(in your opinions) in terms of chamber support and accuracy, Storm Lake or KKM? Thanks!