I would like to duplicate these as they shoot very well in my 223. So far here is what I know, WSR Primer, 24.3 gr ball powder and 55 spire point with cannelure. I'm sure someone else has this figured out and knows what powder is being used. It could be H335, but I'm thinking more likely another ball Powder AA or 748, I don't think it's 748 as they are not as temp sensitive as my previous experience with 748 has been. So if anyone has the answer that would be a big help.