Can I change scopes on my slug guns, rifles and rimfires and crossbow and sight them in on my bench? I see a bore sighter at walmart for $40 would that help? I really need to get close by that I mean within a foot and then take them to the range.

I wanna fool with scopes and rifles and changing optics will be part of my hobby.I bought a Mueller 2x7x40 with red dot and I'd love to use it on my croosbow, my shotgun, cause it it really great on my ML.

thx for your help
lizzzard