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Boresighting

 
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  #1  
Old 08-15-2010, 06:22 PM
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Join Date: Jun 2010
Location: Murfreesboro, TN
Posts: 39
Boresighting

I most recently purchased a 300 ultra mag and wanted to get my scope bore-sighted in...Any recommendations on purchasing a laser boresighter?

Is it better to laser-sight this in @ the shooting range @ 200 yards?
Or should I sight this in using the basic instructions @ 25 yards or so on the paper target?

Your thoughts and opinions are greatly appreciated.
Thank you.
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  #2  
Old 08-15-2010, 06:37 PM
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Join Date: Jul 2009
Location: GEORGIA
Posts: 1,187
Re: Boresighting

I think you should I sight this in using the basic instructions @ 25 yards or so on the paper target then move to 100 yds then move out even farther.

joseph
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  #3  
Old 08-16-2010, 12:01 PM
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Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Boresighting

Plus 1 for starting at 25 yds.

I've never used a laser boresighter, but I've used a couple other types. My experience has been that they will get you "on paper" at 100 yds......not actually sighted in exactly..........that's always required real shooting.

If you use a target w/ inch grids on it, you can easily figure the amount of adjustment needed after your first shot hits the paper. Usually, only a few shots are required for a zero then.
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  #4  
Old 08-16-2010, 12:18 PM
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Join Date: Nov 2006
Posts: 189
Re: Boresighting

Pull the bolt. Look through the bore at a sheet of paper @ 100 yrds. Set up the scope. After I do this I can hit the 8.5x11 paper on the first shot. Move your eye as far back as you can. This will help you to get closer to your dot on the paper.
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  #5  
Old 08-16-2010, 03:53 PM
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Join Date: Dec 2009
Location: Holland, MI
Posts: 1,535
Re: Boresighting

I use this boresighter:

Site-Lite SL-100 Mag Laser Boresighter with SRL-100 Rifle Scope Reticle Leveler - MidwayUSA

I also use this:
EXD ENGINEERING : EXD ENGINEERING VERTICAL RETICLE INSTRUMENT - World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools

before hand so that I know my scope is over my bore, also using a bullet level on top of the turret to be sure the scope is level. Once I know that the scope is exactly over the bore and the scope (and therefore crosshairs) is level, I get to work. Some people also use a "hanging string" to see if their crosshairs are correct; either way works.

You can use a 25 yard mark, but I don't.
The garage door across the street is 100 yards away. I use this program: Handloads.Com Ballistic Calculator to check how much my bullet is going to drop by 100 yards. As an example if I want the bullet to hit 2 inches high at 100 yards, and it's going to drop 2 inches by 100 yards, then I want the laser dot to show about 4 inches above the crosshairs when I project it on a 100 yard object.

Doing this I can get very, very close. Your horizontal alignment will probably be exactly correct but your vertical may vary a bit. This system has worked for me for several rifles in the past year. "YMMV"
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  #6  
Old 08-16-2010, 05:13 PM
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Join Date: May 2010
Posts: 90
Re: Boresighting

I also pull the bolt and look at something downrange- as far away as possible, like a distant telephone pole. I center the bore on that while the gun is resting in the vise. Then I move my crosshairs until they are on that same object. Always gets me on paper at 100.
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  #7  
Old 08-16-2010, 05:37 PM
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Join Date: Jul 2009
Location: Salmon, Idaho
Posts: 392
Re: Boresighting

Quote:
Originally Posted by jeffro View Post
Pull the bolt. Look through the bore at a sheet of paper @ 100 yrds. Set up the scope. After I do this I can hit the 8.5x11 paper on the first shot. Move your eye as far back as you can. This will help you to get closer to your dot on the paper.
+1, no need to buy a laser bore sighter. This works just fine. Gets you on the paper first shot unless you are using a MOA base in which case the line of sight through the bore has little to do with the view through the scope, but it can still be done without purchasing another piece of gear that you won't use enough to justify buying it.
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