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Changed Scopes
14 November 2017, 03:18,
Changed Scopes
Hi Guys,

I have just swapped my scopes over, I was lucky as I did not need to change the rings.

Now here is the problem, I do not possess a bore sight laser. Is there anyone semi close to Cranbourne that has one I could use to bore sight two rifles?

14 November 2017, 16:42,
RE: Changed Scopes
Many shooting clubs will have a sighting device you can use at the range to sight your rifles. It saves time and money, as well as making for happier shooters on the line.

Here is a trick I use in place of the bore sighter or laser sighter. Those devices have not always existed and I began shooting before they were popular/available. "Back in the day" we did a simple bore sighting operation. I do this so often that I have a bottle lid nailed to a tree which is exactly 25M from my back porch.

Pull the bolt from the rifle and secure it on a table or firm support such as a vise or cleaning crib. Make sure it can not easily move.

Looking through the open bore, center the bore on a mark 25 yards away and immobilize the rifle in that position.

Move the cross hairs on the scope to center on the mark. Check the bore to the cross hairs and insure nothing has slipped as you did the scope adjustments.

You can do this adjustment even in the middle of the city with the rifle indoors and looking out a window with the curtains only pulled back a slight bit with the aiming point across the street, ally, or garden. No one knows you are sighting your rifle but you.

Just like with the mechanical devices, this system will usually get one on the paper at 25 yards, then comes the move out to 100/200.

Usually I am within a few inches of the center when I move to 100m. With most high velocity cartridges setting the cross hairs 5cm high at 100 will put one to centered at 200, 20cm low at 300m.

I have both the laser trinkets and a collator with a grid but I find the old fashioned trick of "bore sighting" still works best in many situations.

Many times I have used the sighting devices and found the rifle so far off when I got to the range that I was required to "bore sight" at the shooting bench to get on paper.

I also use the bore sighting trick to check the "sights" on my shotguns. Especially if they have been equipped with slug sights or the bead has been replaced with a fiber optic. Either of those things can mess with the point of aim/point of impact.
14 November 2017, 17:09,
RE: Changed Scopes
If you click this link and scroll down to the third picture you will see German soldiers using this system to adjust the ZF41 scope on a Mauser rifle. They are using a machine gun tripod as a cradle for the rifle.

In this instance they are using the iron sights of the rifle to collate with the scope cross hairs at a known distance. The ZF scope mount was made so the iron sights could be used with the scope in place.
14 November 2017, 19:24,
RE: Changed Scopes
In my experience, the old fashioned bore-sighting method is more reliable than the laser gimmicks.

To conserve ammunition once you have bore sighted your rifle and gotten the first shot on paper, firmly immobilize your rifle on sandbags, so that the scope is centered on your aiming point, THEN, without moving the rifle, carefully adjust the crosshairs so that they move from your aiming point to your bullet hole!

Fire one shot to confirm sight setting. You can then make a fine adjustment, if necessary from there, but you should have a useable zero in firing only two shots. This is most useful in places where ammunition is scarce, expensive or highly regulated.

73 de KE4SKY
"Almost Heaven" West Virginia
14 November 2017, 21:22,
RE: Changed Scopes
It is also advisable to fire at least one three shot group to insure that everything is buttoned down and holding in place, contend with the barrel heating a bit and such.

I have had scope mount screws shear and send things off the deep end, and that usually happens during the first group for some odd reason.

I am building a new scope mount for one of my rifles right now. What I want is not offered, and if it was the trend now is that this type mount would cost more than the rifle itself!

No need for that so I am spending an afternoon in the shop.

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