Dry Zeroing Equipment

[Ashboy]

Hello!

I was wondering if any one has ever used a dry zeroing device?

I do not own one - and have not seen too many optical - boresighting principled devices on the net; but i am aware that these optical boresighters were quite a rage with the russians.

I have seen some laser based bore sighetrs from america and understand how they work.

For the Curious Tom in me i was wondering if any body knows about optical dry zeroing devices and how do they work.

Regards
Ash

[dr.jayakumar]

Had read in google as '' dry zeroing'' also known as ''collimetor or collimator''?maybe wrong.
no personal experiance.

[TwoRivers]

Ashboy: A collimator has two parts. A rod, or spud, which enters the bore, and the optical collimator itself, which has a grid and crosshairs. The spud can be of exact caliber, with a small flat spring that enters a groove to keep it from rotating. Or, they can be adjustable, within range, with a centering cone at the muzzle, and spreadable collett within the bore. This is the type I like, as it works with all rifling types, and requires only three or four spuds to cover the entire caliber range.

In use the spud is inserted at the muzzle, the collimator is clamped to the spud, making sure it is level with the rifle, and the scope crosshairs are aligned with the collimator crosshairs, or a few graduations below. Unless your barrel is crooked, or there is one-sided forearm pressure, your shot will now be on target, or within a few inches at the worst.