Using magnetic bore sighters

Spearhunter

Spearhunter

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Since a magnetic bore sighter is attached to the outside end of the muzzle, how does one know if the boresighter is properly positioned (height-wise) vis-a-vis the scope? Does one need to be precise in measuring the height of the bell of both scope and bore sighter or will a rough visual estimate do? If the bore sighter were attached a bit high, won't the reticles be positioned too high as well?

Maybe the position is negligible at this point since all we want is to get close on paper?
 
Most of them have a curved lens that will allow for misalignment to a degree, so perfect alignment although desireable is not 100% critical.
The reason being who knows if the muzzle is actually true to 90 degrees of the bore, or worse the muzzle brake is actually on straight.
The magnetic bore sighters work about as well as normal 1s do but offer no chance of damaging the bore.
 
Playing with my leupold one - it is not perfect nor repeatable. What I have found with the magnetic bore sighter is that it does a good enough job that I can get on paper at 100m every single time (I have mounted a lot scopes) so it does work in a basic fashion. But if you are looking to zero your rifle, put on the bore sighter, record your adjustment to remove and replace scopes it won't work. It will allow you to swap scopes if you don't remove the bore sighter (I have done that and was within 1" of the original POI with the old scope) but it definitely is not a precision instrument.
 
Glock4ever said:
Playing with my leupold one - it is not perfect nor repeatable. What I have found with the magnetic bore sighter is that it does a good enough job that I can get on paper at 100m every single time (I have mounted a lot scopes) so it does work in a basic fashion. But if you are looking to zero your rifle, put on the bore sighter, record your adjustment to remove and replace scopes it won't work. It will allow you to swap scopes if you don't remove the bore sighter (I have done that and was within 1" of the original POI with the old scope) but it definitely is not a precision instrument.
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Your experiences with them are exactly what I found.
Good enough to get on paper but not much more.
 
My experience with the Leupold is that is is very accurate in getting horizontal alignment but is absolutely useless for elevation. Still, it saves a few rounds by getting you on paper. I like it.
 
Glock4ever said:
It will allow you to swap scopes if you don't remove the bore sighter (I have done that and was within 1" of the original POI with the old scope) but it definitely is not a precision instrument.
Click to expand...

Thanks all for the response. So, theoretically, if my scope has been zero'd and I attach the bore sighter to align with the reticle of the scope, then mark the location of the muzzle in the magnetic base; I could put the bore sighter back in the same place, install a new scope and use that as a guide to get close to my POA?

Nice.
 
Negative Spear - you need to keep the bore sighter on and swap the scope immediately (i.e. if you are upgrading your scope to a better one). If you pop it off and try to mark and reattach - it will be close but definitely not within an 1". What I do is put the rifle into my rifle cleaning station (it holds the rifle firm) look through the scope at the boresighter, as Leupy's aren't demarcated very well I will actually draw where the reticle is onto a piece of paper and then undo the ring screws swap the scope and put the reticle to the same point. It works very well but in the end you still need to confirm zero - it usually allows you to shoot 1 round and move the reticle to make a final adjustment.
 
Read the manual.

Zero your scope with the boresighter,go to the range shoot only 1 rounds,empty the rifle, put your bore sighter again, look through your scope, you will see the target ,your 1st shot, and the boresighter, align the boresighter on the bulleye,and adjust your reticle to the 1st shot you took, and that's it.
 
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