I clip a bubble level each side of pic rail under scope.Bore sight to a plum line about 6 mtrs away.With pic rail level i rotate scope to vertical on plume line.Checking bubbles are good or very close and bore sight perfect to plum line.Just quietly rotate slowly tighning up each scope ring screw a little bit at a time.
Keep checking bubbles and plum line n bore sight as you go.
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