Do I need a bore sighter?


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SHAGGY101
August 17, 2009, 09:55 PM
Gentlemen,

I recently bought a scope and of course want to sight it in. I was wondering do I need a bore sighter or so they just make things quick and easier. If so, what brand or type would you recommend?

Thanks

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wadeh
August 17, 2009, 10:23 PM
Shaggy,
If you have access to a gun vise at a range, the best way to get on paper is to clamp the weapon in the vise pointed at a target at 25 yards. Remove the bolt and center the bore on the target as best you can by looking through bore. with it held in that position, use the windage and elevation adjustments to move the crosshairs of the scope to the same point that you have centered the bore on. At that point load a round in the chamber and fire the weapon with the crosshairs still on the aiming point. Now,without moving the weapon, use the windage and elevation to move the crosshairs to the actual point of impact of the bullet. Now you can take the weapon to the 100 yard bench and be reasonably sure you will be on the paper. If you don't have access to a vise, you can do the same thing by sandbagging but it will be trickier to make sure you don't move the weapon around to much when you make your adustments. If you take your time and make your sighting and adjustments carefully, you will be very close at 100 yds and only need a couple of groups to dial it in.

SHAGGY101
August 18, 2009, 09:38 PM
wadeh,

I do not have a bolt action. I have a mini 14 and therefore cannotl ook down the barrel. Any suggestions?

DRYHUMOR
August 19, 2009, 06:02 AM
You could figure the mid point of adjustment for windage and elevation, by counting clicks on your scope. Set them both to midpoint, go to 25yds and shoot. Use a 3' x 3' or larger target backer. Furniture cardboard would work well.

Sight in for your expected point of impact at 100 yds, them move to 100 yds and fine tune.

ranger335v
August 19, 2009, 03:09 PM
"I was wondering do I need a bore sighter or so they just make things quick and easier."

NO. Just set a large target at about 25 yards and get a rough zero there, hitting maybe an inch low. Then go to 100 and finish the job.

I use my (Bushell Pro) optical bore sighter mostly as a point of reference check for a scope that has already been sighted in. But I think lazer boresighters are really good if you're planning on zeroing at night.

rcmodel
August 19, 2009, 04:06 PM
Take a ruler or tape measure with you.

Shoot a 3-shot group off a rest at 25 yards and measure the distance of the center of the group to the center of the target.

What ever the click value of your scope is will be 1/4 of that at 25 yards.

Say you have 1/4 minute clicks.
Say the bullets hit 4" right and 3' low.

If you were shooting at 100 yards you would need 16 clicks Left, and 12 clicks Up to center the group.

But you need four times that many at 25 yards, or 64 Left and 48 Up.

Once you have that zero, move out to 50 yards and do it again.
Then finish zeroing it 1 1/2" high at 100 yards and you will be zeroed at 200 yards or so, depending on the load.

That will give you about.
100 = 1.5" high
200 = 0.0
300 = -7.7" low
400 = 24.0" low.

rc

Zeke/PA
August 19, 2009, 05:50 PM
In my pre-boresighter days I carried brown wrapping paper to the range when sighting in rifles other than bolt actions.
Starting at 25 yds. tack up a 4 ft, square section of paper and go from there.

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