You might want to try 73.1 grains, Norma brass and Federal 215M primers. I did a lot of work with the 200 grain LRX bullets last fall. Rifle has a SAAMI spec chamber and cartridge OAL turned out best at 3.42.
This is a warm load with a slight amount of primer flattening in this particular rifle. Start several grains lower and work your way up.
Good luck and good shooting. gun)