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I still reckon those colimators are more for confirming a zero. IE you zero the rifle using lead, fit the colimator and take a note of where the crosshairs are. Then if you think you bump the scope...

i did that with my 416. Bore sighting with a barrel that size is problematic. slight shift in head changes it quite a bit. almost like paralax.
Had a case with a split neck (initial loads made from...