Sighting in difficulties

[DitchDR]

About a month ago or so, I picked up a DPMS LR308. Has the big heavy barrel. 1:10" twist. The scope I have on it is a Simmons 6-18x40 wih adjustable parllax to 100 yards. Yes I know I should get a different scope. The reason i have this scope on there is that I had it on a Remington 700 VTR .308 and I was shooting 1.476" @ 200 yards with it. SO why not put it on here. The scope is mounted on a 2" riser. I zeroed it at 50 yards. When I move farther back my shots hit high and left and closer than 50 yards the shots are low and right. Ammo used: 165gr Hornady Superformance, HSM 168gr Match, 150gr Hornady Superformance, 150gr Remington, 180gr Federal, 150gr federal, 150gr Federal Fusion all with the same results. I can understand higer and lower at varying distances, but I dont understand the left to right. Can any of you give me any pointers? Should I zero at 100 and see what happens?

[Pinnacle]

Are you sure that you are not canting the rifle to the left slightly? Are you sure that the Scope is mounted perfectly? Thats where I would start.

[ree]

Are you sure that you are not canting the rifle to the left slightly? Are you sure that the Scope is mounted perfectly? Thats where I would start.

+1 That would account for the lateral shift at differing distances. Zeroing at a different distance will not fix cant in the scope mount or your hold.

[DitchDR]

I dont think Im canting the rifle, but I could be. I am shooting from a bipod, but that doesnt mean I am not twisting it one way or the other. Ill take another look at the scope. Who knows, I may have been canting the rifle when I look through the scope when I mounted it. The riser is an AR riser Weaver is the brand. SO im pretty sure that on strait. Ill try it in a lead sled and maybe have some one else shoot it. I dont think its the rifle itself giving me the problem. Its either me or the scope and Im leaning towards me being the problem.