I just finished my first savage build in 7mm-08, it was originally a 243. It is a stagger feed design. When I load the mag up, the first two rounds (top two from mag) cycle and chamber just fine. The problem is with the third round - as soon as the bolt head touches the third round, it literally pops up (sometimes kicking the back of the case out the chamber) making chambering very difficult. It does not do it for the last round either. Would this be caused by the mag lips being adjusted incorrectly or something? Thanks in advance.