How far off is a Bore Sighted Scope

Discussion in 'Rifle Talk' started by mapanggulo, May 18, 2004.

  1. mapanggulo

    mapanggulo Well-Known Member

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    How far off zero would a scope that has been bore sighted shoot ? I had a gunsmith install a scope on my .30-06 and now need to get out somewhere and zero it before I go hunting. Am planning on zeroing it at 200yrds and was wondering how far off it will shoot.
     
  2. stoogots

    stoogots Active Member

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    There's really no telling how far off it will be, in my opinion. Hopefully you'll be on paper. The only advice that I would give you is to use an oversized backdrop so you could see where your bullets are hitting. Also, start off at 50 yards to make sure your on paper and make your adjustments, Then move out to 200 yards.
     

  3. gwp4ever

    gwp4ever Super Member

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    I replied yesterday but I don't know where the post went. Anyways, Stoogots summed it up pretty well. I've had some guns boresighted that werent even on the paper and others that needed very little adjustment.
     
  4. vette_lover2004

    vette_lover2004 Member

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    I think it has a lot to do with the scope and how big the crosshairs are in relation to the grid on the boresighter, if that's what you use. Also it depends on if the scope is tilted a bit. I heard magnification settings have a big play in this when you bore sight. Not sure though. A friend of mine uses the laser collimater and says that he is usually no less than 5 clicks from zero.
     
  5. B540Glenn

    B540Glenn Active Member

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    Don't get frustrated that your shot placement isn't moving when you only move it one or two clicks. At 50 yards it's 8 clicks an inch (25 yds 16 clicks). 4 clicks is only at 100 yards.
     
  6. Drop-Shot

    Drop-Shot Super Member

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    Hey guys are some lazer boresighter better than others?I see several different types and brands from 79.95 on up.Which are the best? the ones that are inserted into the barrels at the muzzel or the breech?Drop-Shot
     
  7. mountainview

    mountainview Super Member

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    Ditto on what Stoogots said. I would add that it would be preferable to start out at 25 yards using a 18 or 24" square target to be sure. Sometimes, you'll be real close and other times you will barely scratch the edge of the target after boresighting. Only way to tell for sure is head to the range and shoot a couple rounds.
     
  8. Drop-Shot

    Drop-Shot Super Member

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    hey guys,I've heard that some lazer bore sighters are so close that you are defintly on paper at 100 yards.I have an old Bushnel Bore Sighter and when you center it you are off paper at 100 yards,Whats better? Are some lazer bore sighters better than others?If you have any thoughts or knowledge please respond as I want to get rid of the old manual bore sighter and buy a lazer one.Help! Drop-Shot
     
  9. gwp4ever

    gwp4ever Super Member

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    Your old boresighter would probably work fine if you started shooting at 25 or 50 yards and then moved to 100.
     
  10. I learned to sight in at 25 yards when I was in the corps. That should put you on paper at a 100 yards. Look up the ballistics for your round that way you know what your bullet drop will be. If you have a bullet drop of 2 inches from a 100 yrds to 200 yrds you can set your sights 2 inches high at a 100 and you will be in the kill zone from 50 to 200 yrds for a deer size target. hopefuly I explained this right.
     
  11. Drop-Shot

    Drop-Shot Super Member

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    Guys forget the old boresighters,they were good for their time but that time has passed.I bought a new laser boresighter from Natchess supply.It's perfect.I didn't like the target I got with the boresighter so I made one with a regular sheet of copy paper,found center and used a ruler to make a fine longitudnial and transverse line,the rifle is in a rifle vise and beam turned on. I first set side to side then 2 inches high at 25 yards.I went to the range and the side by side was right on,I just had to adjust for 2 inches high at 100 yards,took 3 shots.The 358 blr shot the first 2 225 gr silver tips touching,the 3rd shot was a little higher.This short lever action with a 20 inch barrell heats up fast.I will never go back to my old boresighter.I had lost one of the arbors to fit the 35 cal and I could not just buy 1 arbor,they wanted to sell me a whole new set.The laser is right on and thats all I will use in the future.I hate change also but this thing works and works great.Drop-Shot
     
  12. richardschennberg

    richardschennberg New Member

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    I've had good results by removing the bolt and placing the rifle on a firm rest. I adjust the rest to get the rifle pointed to the bullseye or other identifying mark on the target (sigher targets often have 4 or 5 bullseyes). Then I adjust the scope to line up with the bull. I look down the bore one more time to check that the rifle is still aimed at the bull.
    This method is good for an inch or two at 25 yards. It generally will take fewer shots than if you just use an optical bore sighter.
    I have also used laser bore sighters. You have to adjust the laser (Use another rifle that is already sighted, or rotate the laser sighter and adjust until turning it no longer affects the aimpoint). If your laser sighter won't quite adjust to zero, place it so that it aims vertically high (to eliminate parallax error for close shots) or vertically low (if you want the aim to be high for long shots). It works best indoors or on a cloudy day. They are somewhat more precise and easier to use than most optical bore sighters, which seem to inevitably be dependent on the height of the rings.