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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 08:22
Astro8 View Drop Down
Optics GrassHopper
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As I haved learned, thr Optics Forum has some very knowlegeable readers.  What I am looking for is software that will give me the data I need so I can use a Laser Bore Sighter at 10 meters (33 feet) and get a 300 meter Zero.  I have looked at a variety of Laser Bore Sighters and have found one that is used by the U.S. Military.  The manual gives data on zeroing in a M240B at 10m with a 500m Zero.  Good stuff, but I don't have an M240B.  And this LBS is expensive, at least by my standards.
I would appreciate any help.  Thanks and good shooting.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 09:18
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What caliber, what specific bullet (so I can look up the BC), what elevation, avg temp you will be shooting in, what humidity, estimated velocity, how high is your scope above the bore line?  Get me that data and I can give you an estimate.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 09:32
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http://www.jbmballistics.com/~jbm/cgi-bin/jbmtraj-5.0.cgi


That will get you "most" of what you want.

But, be advised: nothing is "true" in shooting till it has been tested with your gun, your ammo, and on a genuine known-distance range.

Anything and everything you get on trajectory is an estimate, it ain't real till you put rounds down range.  Dope is rifle-, ammo-, and shooter-specific.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 12:50
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  Would you please post up what brand of bore sighter this is, I would be very interested in a bore sighter that actually works. I have a BSA colimater style that is a pos and a tasco laser that doesn't rate any better.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 12:55
supertool73 View Drop Down
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I just use a cabelas laser bore sighter.  It does exactly what it is suppose to do, it gets me within about 4 inches and then I adjust the scope from there.

What is the problem you have having with your tasco?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 13:14
rjtfroggy View Drop Down
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  It is always 10-12 inches off and the red dot is broken up when looking through the scope.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 13:17
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Does it have an adapter to make it tight in your bore?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 13:24
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I have not had much luck with the laser bore sighters. 
I use the Leupold magnetic bore sighter.  It does exactly what it is suppose to do. 
Since I have gone to it, Iam close to zero on the first shot and I can mark the location for easy zero in the field in case I lose the zero by accident.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 13:29
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Here is the ballistics program I use.  You can download a free trial to see if you like it.  I have had no prblems with it.  Its probably not the most expensive program out there but it works for me... Good Luck!
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 13:32
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 It has the adjustable arbor and I make sure it is tight every time.
 The only time it is even close is if you use it at night and at the right distance  ei; 100yards but I'm affraid the neighbors will get nervous if they see red dot on the side of their house. I would rather something I could use in the basement where I could set it at 20 yards and be close at 100.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 14:04
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The Leupold bore sighter does not have to have a distance... Set it at the end of your bore and go... its easy and you don't have to worry about your neighbors thinking their about to be raided by the polizei.... Wink
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 14:14
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Originally posted by rjtfroggy rjtfroggy wrote:

 It has the adjustable arbor and I make sure it is tight every time.
 The only time it is even close is if you use it at night and at the right distance  ei; 100yards but I'm affraid the neighbors will get nervous if they see red dot on the side of their house. I would rather something I could use in the basement where I could set it at 20 yards and be close at 100.


Yup, that is one thing I have found with the laser boresighters.  You do have to do them at distance or do it close range and figure out the extra adjustments you need with a ballistic program.  With an AR and using at 50 yards I am always within 1 inch of my bore sight. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 15:59
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if nothing else works try this site http://www.thebestofthewest.net/ballistics-compensator.html
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/14/2009 at 22:12
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The Laser Bore Sighter is an Insight Technology LBS-300C.  Current price is around $750.00 This is used by the U.S. Military and has received very good ratings.  It is not a "pos".  Check out http://www.insighttechnology.com/InsightAimandIllum.html
Look at the AN/PEM-1 LBS.   Also look at http://www.insighttechgear.com/products-lbs.htm
The Military designation is AN/PEM-1 with a civilian designation of LBS-300C.  The only difference I can note is the military comes with arbors for 5.56mm NATO, 7.62mm NATO and 12.7mm NATO (.50 BMG).  You don't get the .50 BMG with the civilian version.  Hopr you find it interesting. 
Thanks to all the other contributors for their worthwhile advice. 
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