Quote Originally Posted by HW55T View Post
Probably better for the scope to centre the ret by putting it in a V block and rotating the scope, sighting at a fixed object of known or set distance.
Please tell me the point in "centering the ret"

Once it's fitted to the rifle the adjustment to zero the POA to the POI will be what it will be, for that combination.
I really cannot see what difference faffing about before fitting makes to matters