Bore Sighting / Distance to Target

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jckw

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Just bought a 700 SPS with a Leupold VX-II 3-9x40 and I'm going to bore sight it next week, but I have a few questions:

A) I do not have any sort of stand or vice for my rifle, so what's the most accurate way to bore sight?

B) When measuring distance to target, where on the rifle does this distance start? And why?
1) End of muzzle?
2) End of scope?
3) End of projectile?
4) Base of the casing?
5) Other?
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A) I do not have any sort of stand or vice for my rifle, so what's the most accurate way to bore sight?
Click to expand...

If you are using an optical bore sighter,it doesn't matter.I often hold the gun in my hands when using my Bushnell bore sighter.If you are bore sighting by looking through the barrel at a target,place the gun on your normal shooting rest.

B) When measuring distance to target, where on the rifle does this distance start? And why?
1) End of muzzle?
2) End of scope?
3) End of projectile?
4) Base of the casing?
5) Other?
Click to expand...

It doesn't matter.Perhaps you aren't realizing that bore sighting is only meant to get you on the target paper,it can't be used to replace actually shooting the gun to sight it in.It would be impossible to properly sight a gun in with a bore sighter,given that different loads will produce a different point of impact at the same distance.
 
B) When measuring distance to target, where on the rifle does this distance start? And why?
1) End of muzzle?
2) End of scope?
3) End of projectile?
4) Base of the casing?
5) Other?
Click to expand...

Who cares? The distance to the target is somewhat irrelevant.

When boresighting, you remove the bolt and look through the barrel till you can see the target. It is best to try to line up something with a vertical and horizontal surface (like the edge of a piece of paper).

Then once the bore is lined up with the target, you adjust the scope crosshair to match what you see through the centre of the bore. This is why it is called boresighting. Obviously you need to do this without moving the rifle.
 
The most accurate way to boresight is probably to use a laser boresighter. If your rifle is in a common calibre you may find one at a price you think reasonable.

If you are using a traditional optical boresighter, it is attached at the muzzle, so there is no question of range.

If you can take the bolt out and look down the bore, the range is limited by how well you can see the target when looking down the bore - obviously this is going to be done with the naked eye. And in any case, as the others said, measuring that distance isn't important.
 
The act of bore sughting is to get the point of impact of the bullet on paper. beginning at about 50 yards, support the gun with bipod or rest, fire at center. Adjust the scope crosshairs to the hole. fire again and ajust the scope slowely til the holes are in the crosshairs. Take the target out further and refire...adjust ...move target to distance you wish to shoot it at and refire ..readjust. Different weights of bullets will impact at different places on the target. Always shoot the gun when changing ammo to correct the scope adjustment. Normally a hole that is 2 inches high of dead center at 100 yards will give a center shot at 200. depending on the rifle and shooter of course.
 
What I did before I hit he range was:

1) look down my barrel and find a prominent object (Top left edge of telephone pole)
2) keep rifle supported and adjust the scope until it is pointing at the pole
3) zero with bullets - my first group was off only about 4 inches diagonally from centre at 100m
 
Gunner4life said:
What I did before I hit he range was:

1) look down my barrel and find a prominent object (Top left edge of telephone pole)
2) keep rifle supported and adjust the scope until it is pointing at the pole
3) zero with bullets - my first group was off only about 4 inches diagonally from centre at 100m
Click to expand...

That's the way everybody did it, until somebody figured out he could make money by selling 'bore sighters'. I suspect he later came up with ShamWows. I think his name is "Vince"....:D

Reminds me of a guy I saw at the range a couple of months ago....dressed in full camo, of course.....had his barrel (about 4" from the muzzle) over a block of wood, holding it down for dear life with his left index finger hooked over the barrel, and then screwing madly on his scope turrets after every single shot, while cursing up a storm about his 'no-good scope'. All brand new gear, of course. Very shiny; very pricey. All I was thinking was "now there's a bargain on a rifle & scope waiting to happen!".
 
I've never had any problems doing the bore sighting the old fashioned way mentioned above. A couple of things that might help, Get a big piece of packing paper or a large piece of cardboard to put your target on. That way if you are off a bit more than you though you can still find the bullet holes. Once you find the holes just put your sights over the hole and without moving the rifle adjust the crosshairs of your scope until they are over the center of your target. Shouldn't take too many tries to get dead on. Also a couple of shots at 50 yards first, then adjust, then move to 100 can make things easier.

I don't think the distance between the chambered bullet and the end of the muzzle will make any noticeable or correctable (scope wise) difference in elevation at target. Besides you set your scope for each range individually anyways so I don't think it matters.
 
That's the way everybody did it, until somebody figured out he could make money by selling 'bore sighters'.
Click to expand...

I have owned my old Bushnell bore sighter for close to 30 years,and probably used it 200 times over the years.The way that I see it,the fact that I am always on the paper at 100 yards with the first shot,it has paid for itself several times over in ammunition saved.
 
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