After fooling around with the tack driver rest i have concluded that there has to be better out there. It opened my groups up at 200 yrds to 3 in. I thought it was my load at first. Long story short. I slid my rifle back where it was not confined in the bag and used a rear bag and shot a .600 group at 200 yrds. I knew that couldnt be a good thing. My time on the range has proven to me the more you try to confine a rifle the worse it will shoot.