boresighter

[dazza]

could anybody explain how a boresighter works?

[Dunkield]

The laser ones shove up your barrel and send a beam out that should be inline with the axis of the bore.

When you look through your scope you can then adjust your crosshairs to hit the laser dot.

(you can do this by looking down the barrel, with the bolt out, and sighting something in the distance - I do that to get the first few shots on the paper at least)

 

Christ knows how those ones that go on the end of your barrel work though

[MC]

Stuart,

 

Does that mean that your POI is exactly in line with the barrel? Because surely it isn't? or is that just a system to ensure that you know where the first few shots are going?

[Dunkield]

I don't think they claim to replace zeroing, just to save you ammo getting that first shot somewhere you can see it.

I look at something about 100 yards away and then bring the crosshairs over (remember that the scope controls are back to front in this instance) then do the rest on the range.

Obviously none of these methods or tools know where you bullet is going to go.

I only do this if starting from scratch with new scope or rings etc.

[A Sick Old Man]

you use the laser to sight to your true zero, as the bullet leaves the barrel it travels through an arc see the link and then drop down to see the .17 bullet flight diagrams

 

http://www.varmintal.com/17hmr.htm

 

 

, I zero my .22 rim using 40grn hollow point at 25 yds, this means it will also be on the money at sixty yards. Those lasers will go out to about eighty yards, but if you use the true zero you do not have to use the Huble space telescope to see the red dot.

 

The .17 is not a good illustration of this due to its flat path of flight, but its the only pic I can find.

[Eagleman]

As I understand it the Bushnell laser boresighter (as sold by Sportsman) only has .22 and above arbours? No good for HMR as there is no .17 arbour in the kit.