Alex runs a 35° shoulder, not a lot of taper, his chamber to die fitment is great. Alex is a top shelf rifle builder. I've always wanted to have him do a build for me.At this time I do not know what version of improved I will be getting. I am still waiting on my barrel from Bartlein and when I get that and send it off then I will discuss that with the gunsmith, Alex Wheeler, who will be chambering my barrel and joining it with my action. I have full confidence in Mr. Wheelers's recommendations.