I finally got to chrono mine yesterday. In my 300 win mag I was getting 3228 fps out of my Sin-Arms 28" barrel! Now granted it's a 28" barrel but with speeds like that I think I'll forget about building a Weatherby or a RUM. At least for now anyway. I also chrono'ed some 243 superformance varmint with the 58gr v-max. My 243 is a Ruger M77 MKII Varmint/Target with 26" barrel. It's barrel must be a little slow or that load doesn't live up to expectations. I got 3810 fps out of it. Nothing to sneeze at but Hornady quotes 3925fps for that load and I think that's from a 24" barrel. I haven't checked the bore yet to see how dirty it is though but given the speed and accuracy of it I can live with a dirty bore.