I am of the opinion that there are cheaper ways to do what you want, but in the spirit of firearms as a hobby, never let cost get in the way of a project.
I've seen some wilcats in the 9.5 bore before, and at best they are a "marginal increase" over the standard long range fare. But their creators have fun building them.
Have you shot much long range before?
Machine guns are awesome until you have to carry one.