According to the Hornady 9th edition, you are past the max load at 37.2gn. They are listing a MV of ~2700 with a max load of 37.1gn Varget out of a 24" barrel. You can also check http://data.hodgdon.com/main_menu.asp which lists a max load of 39gn. Your call on testing the upper bounds or seeing if the gas system can be adjusted. Have you tried any factory ammo yet? That should give you a good indicator if the rifle is setup correctly.