That's why I still use an older Bushnell boresighter that mounts on the muzzle. With the three adjustable spuds it will work on anything from a .17 to a .458. Old tech but I've never had it do me wrong. 
Go tell the Spartans,Travelers passing by,That here,Obedient to their laws we lie.
I'm older now but I'm still runnin' against the wind
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