I bought a 3-10-42 z3 about 2 years ago, its been on my 243 and now sits on my 25-06. So i took it out this morning set up a target and shot a nice 3 hole group @100 yds on 6x power. I then wound the mag up to 10x And took a further 2 shots, but the shots that i took at full mag did not hit the target. I should add that the barrel on the rifle had cooled down before i took my second shots. I think the scope might need to be sent back to swarovski, unless anyone has any other ideas as to why the zero changed?