For mounts I am using a Leupold 1 piece base and matching rings. They are tight. The scope has been a proven winner. It was on top of a gun that shot .1's and .2's all the time. It is a 2.5-8 Leupold VX3. Very good scope. So I have ruled out the mounting/scope problem. It has to be something with the rifle itself. I know there are better mounts/scopes, but when I have the same mounts/rings and a VX2 on my 300 RUM and its holding up just fine, thats what makes me realize it has to be the rifle. I have never had any problems with Leupold bases or rings holding a scope down. I am going to try some 150g BT's but that kinda defeats the purpose of this rifle. I wanted it to shoot 130's or 140's fast and accurate for LR deer out to 800 or so, but the 150g is the only weight I haven't tried for my application. It might do the trick. Also I'm going to try and use Win primers and RL-22 and mess with things more. But lemme tell ya, this rifle has been a pain in the ***. Its really frustrating to always see 2 good shots to see you have somewhat of a load going, then it always shoots a flyer. Usually by the 2nd trip out to the range I'll have found a load for the rifle at least 1 inch. I have shot upwards of about 20 loads now, so about 60 shots, and the very best 3 shot group I have gotten is 1 1/4". It doesn't really seem to have a preference for OAL either. I have seated them out to where there right off the lands and I"ll get 2 close and a flyer, or I will seat them way short like factory and I'll still get 2 shots close and a flyer. So I'm really stuck as to OAL. However, targets indicate that with the slightly longer OAL, the 2 shots are usually closer or touching. Thanks for all the reply's, I'll be posting the results of RL-22 and the 150g BT's.