RE: bullet vs twist info
Rod,
If he wants to shoot that light of a bullet, he needs to back that powder charge down to around 80gr if he wants any consistent accuracy. For the short term, he might can get by with the 100gr of Cleanshot if he moves up to the 275gr PowerBelt - a bullet that I think he would be happier with anyway.
In the long term, I HIGHLY recommend contacting Cecil at PR Bullets and get his recommendation - he is truly a wizard at this stuff.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Trust God..........but keep your powder dry!