I am having a hard time wrapping my head around something. I seem to shoot my best when I pull the rifle rearward into my shoulder. The problem I have is that it seems to cause a lot of tension when I try and do that. If I try and relax more the gun seems to hop and I start to lose my groups. I am using a Harris bi-pod and Crown Royal bag filled with sand for a rear bag. Any suggestions? I know I should sign up for lessons, but that is not in my budget right now. Thanks in advance for the help.