Man that's cool as hell, would like to shoot it and meet the man that gassed that thing so it would run right, what a sweet piece, Congrats!
She runs right, from 500 grain FMJ Remington factory to my 350 grain medium reloads. I've got about 40 rounds thru it so far, kick is about like a 300-338 win mag, NOTHING like a bolt 458!
F'N sweet man, anyway you cut it, I have a Belgium BAR grade II in 338 WM, it's a sweetheart in it's own right, 250gr Partitions at 2700 wont refuse much ; ]