Hey Guys, I've got 50 rounds down a Bartlein 5R barrel now for a 300wm using 185 gr. Berger hunting VLDs and 82.8 gr of H1000. I'm getting 2930 fps average with a few at 2960 toward the last of the 50 rounds. I thought I saw a post somewhere here about a new barrel increasing velocity until it was totally broke in; maybe by Coyboy? I've got a load worked up and was going to start shooting with a drop chart. How much velocity change can I expect for the barrel?