I found CCI standard velocity are the way to go. Subs get hard to find and get pricey.
The CCI standard vel. is subsonic @1050fps, but 4.5 Pac-Lite will keep bulk pack from breaking sound barrier either way. I have a Mark III with Pac-Lite and Volquartsen trigger parts and have shot a lot of different rounds out of it nothing has gone super sonic on me yet. The only thing left from Ruger on mine is the frame, pins, and magazines.
The wait sucks but will be worth it, only thing I could suggest from here is a fiber optic front sight, makes sight picture 100x's better.http://www.midwayusa.com/viewProduct...tNumber=885404
Also Volquartsen trigger kit.http://www.midwayusa.com/viewProduct...tNumber=319266
I have my reset and pull to where you have maybe a 1/4in of trigger pull nice 2lb pull.