Mr. White,
Short action and 8" twist.
75gr Gay-Max and RL 15 go together like cocaine and strippers.
I builted mine on a Vanguard. Douglas #3 finished @ 22" I believe. It originally had a floorplate but I saw the Howa conversions in my local shop and figured WTH? Didn't do anything regarding COL, but it sure feeds like a mofo with that single stack setup.
Travis