Howdy all, I'm shooting 140 Hornadys out of a 264 Win Mag Sendero II. With the original bedded HS stock, I was getting 1/2" groups. Trouble is, I've always hated HS palm swells. Two days ago, I changed stocks going to a Bell and Carlson M40. I went from 1/2" groups to about 2" groups! The barrel is still free floating, the lugs are tightened to 30"/lbs, haven't had it bedded. Floorplate opens and closes ok so it's not binding. I need some opinions as to where to start to get the groups back down. Please advise. Many thanks, in advance, for your help.