ziess z 800 on 300 win mag

[hunter 22]

HELP

Folks I'm having a hard time sighting my rifle in with this new scope. I'm shooting 180gr barns TSX at 3080 fps with a BC of .436. does anyone else have this scope and having problems with it or is it me. I'm shooting 1/2 groups at 200 but I'm shooting hi at 300 and all over the paper from 400 to 800.
all suggestions would be appreciated

Thanks,

 

[MTBULLET]

"high and all over the paper" probably isn't the scope. Is everything tite?

 

[hunter 22]

I thought the same thing
I just re mounted it used lock tight on all screws every thing seems tight