(1) .300 from slugging it?
(2) What does the chronograph say when the primers flatten?
(3) What happens if/when you pull/use bullets from the "normal" commercial Rem/Federal cartridges in your own handloads.
(4) What happens if/when you use the "normal" commercial Rem/Fed powder charges in your own reloads (using same weight Nosler bullets)? (you might want to pull a coupla grains off at trial's start.)