cartridge bore sighters

[Olympus Racing]

do they work? i just found out about them by accident on amazon.
the concept seems legit and efficient.
but does it work?

 

[Marty McFly]

They do work. To a certain extent. They usually get me on the target then you still need to dial in at the range.

 

[grizquad]

I have one for 12 ga. and it lets you know where the barrel is pointing. Used it a few times and is in my range bag.

 

[knoxy]

They work well enough. I use one to get my rifles roughly zeroed. Good enough for NES car shoots.