Buy a Swivel Stud and replace one the the Screws that hold the Bipod Rail to the stock with the Stud and a few Washers, Attach the Bipod to it. The factory Slider is NOT worth a crap for Precision shooting.

Are you torquing the action bolts to 65 INCH lbs ? if not, you need to

Replace the POS Scope Bases... NOW

Have you Re Checked the headspace ?

Clamp a board, or Temp Screw a 1X2 to the bench to load the bipod against, or, better yet, get Off the bench and shoot prone....

If that does not help, Try the FGMM 175 Grain.