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BDC scopes

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2013 at 18:25
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Optics GrassHopper
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Joined: January/26/2013
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I'm sure that one scope doesn't work for all caliber rifles.  Is there an adjustment on the scopes for the caliber of rifle you're using.  Or is it necessary to buy the scope you want according to your rifle caliber.  Do you understand my question ??  Slopeboard
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2013 at 18:44
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Optics GrassHopper
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Most of the faster magnums work with the power ring set to the maximum power of the scope and zeroed at 200 yards. That is why I don't care for the power topping out more than 10x.
 
With the standard rounds like 30-06, you will have to turn the power  down slightly. Through trial and error text firing at the longer ranges. As the power is turned down, the amount of drop on the target increases between where the horizontals in the scope reticle coincide with the target.
 
When you find the sweet spot with your favorite load you may want to cut a notch on the power ring, so it can be set quickly.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2013 at 18:58
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Optics Master
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Scope Swapper

Joined: October/17/2009
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Check the Paperwork with the particular scope and some are designed for certain Drop Tables or certain FPS or Certain bullet weight or Certain Calculations.

2 my limited knowledge.

No BDC scope is dead on for more than one Drop Table unless calibrated with different Cam's.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2013 at 19:13
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I like dials much much more.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2013 at 22:44
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Optics Master Extraordinaire
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First focal Plane reticles, with matching target turrets are by far the easiest to learn and use. Most BDC reticles, are second focal plane. This means the reticle is always varying depending on what magnification the scope is set at.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2013 at 07:06
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Tip Stick

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the Nikon ones are not caliber specific.  Nikon has a balistic calculator on their website(I believe) that you put your info into and it will "calculate" what the circles represent for your load.  You will then have to verify this by shooting/testing.  I would think that is going to work on a single power setting, but I could be wrong about that as I haven't gone to the website and figured it out.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2013 at 07:33
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Georgia peach

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I have an older 5.5x16 by something with BDC. the retical is based on 3000fps. I have my 300win mag zeroed at 220 yards and it puts me pretty close to dead on at 600 yards.my load is 2950 or so. I had to do a lot of shooting to get all the drops to fall in the circles. I started with a 200yd zero but fell short on all else. I moved out to 210 yards and my 300,400,500 aiming point was bottom of the circle in the retical. I moved out to 220 zero and it moved things up to almost dead center of the circles. Just play with it and see how it falls out with your rifle and load.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2013 at 13:18
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Optics Jedi Knight
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most bdc reticles are calibrated at 200 yds. . this allows the maker to put almost all calibers in 4 basic classes of drop, based on more than say 35 inches of drop. given a cone of fire of 6 inches, (size of target) this allows one setting to be used for many caliber,bullet combinations. some makers leo as an example simply lower the power setting calibration to make up for a group of cartridges having more than the group of cartridges just faster. bdc reticles are characteristic in that the spacing usually increases in moa as the distance increases, whereas mil in something like an ffp remains constant.
they all can be recalibrated to lower magnification by simply getting a target grid and noting where the intersects are in inches at the power setting you have in mind. this will be the moa drop of that "power" setting.by  know the the drop of the round you are using from a ballistic program you can then choose any set up you want. you can't do this with an ffp (and most people who have them don't want to) each one has advantages and disadvantages.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/02/2013 at 18:19
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Optics GrassHopper
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Most BDC scopes are some sort of circle or line set at a certain distance below the crosshair (sublimated). The majority are 1.5mil from the crosshair, then 3 more mil, then 3 more mil, then 3.5 mil lower, etc. A large portion of Magnum and super velocity rounds will cross these lines at approximately 100 yard intervals, when the crosshairs are zeroed at 200 yards. Standard velocity rounds should be zeroed at 100 yards for similar effect. Zeiss has a great website (http://sportsoptics.zeiss.com/hunting/en_us/riflescopes/rapidz.html#inpagetabs-2)  for their Rapid Z reticles, which show an "ideal" magnification for your bullet type and velocity. When set right, they are within a few yards of 100 yard steps all the way out to 600, 800 and even 1000 yards. I assume these numbers would be very close on other similar scopes. (The Rapid Z 600 is damn near dead on with my 168gr .308 rounds out to 500 at least). Nikon also has their "Spot On" website (http://spoton.nikonsportoptics.com/spoton/) that works very well with Nikon scopes. Sorry for the long post. It's much easier to understand when you are on their sites.  
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