Capt Frank, that's a McCann gasplug I have on it.  It has 5 jets you can change.  The middle jet will just run the Garand with a caseful of RL19 behind a 150gr bullet.  I can't recall how many grains that was!  I mostly use the smallest jet and try to keep powders more in line with those normally used in the Garand.  Oh, you made me remember, I have some cast loads I want to try!  Some 193gr bullets, NOE copy of the Eagan MX2-30-H.