OK Brad.
Looks like your guess was 23 fps off. Pretty good guess.
Maybe I need to stay at 4.2 if your data shows I'm at the limit on Herco.
1177 fps with a 150 gr. HP still translates into a mid range 357 Mag type load, 17 rds or 32 rds. of which sit in a Glock Mag ready to head down range as fast as you can pull the trigger. I like this rifle.
Oh, did I mention with over 600 rounds of various nose styles and powder charges shot through the rifle , it has had zero malfunctions.
Brad, Thanks again for your efforts,
Ben