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Queston on Vortex scope w/BDC Reticle

 
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  #1  
Old 04-06-2013, 10:03 AM
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Location: Jeffersonville, Ohio
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Queston on Vortex scope w/BDC Reticle

Hello, all.

This is my first post here, and I'm hoping someone can answer my question.

I just traded for a Savage rifle in .204 cal. It came topped with a 6x18 Vortex Crossfire scope with Dead-Hold BDC reticle.

This is the first scope I have ever owned with a BDC reticle. There are a couple of things I don't quite understand about it.

First, the literature that came with the scope says to zero the main crosshair for "High Power Big Game Rifles" at 100 yards. But to zero the main crosshairs on a "Big Game Magnum Rifles" and "High Velocity, Small Caliber Varmint Rifles" at 200 yards.
I can't wrap my head around the reason for this. Can anybody enlighten me in layman terms?

Secondly, what would the results be if I did zero the main crosshairs at 100 yards rather than 200yards with the .204?

Most of my shots will not be much more than 300 yards, and more likely to be in the area of 150-200 yards. So I really don't need ability to reach out to 500 or so yards, especially with a lightweight like to .204. However, it would be nice should the shot ever present itself.

Can someone please help me out with this?

Thanks..

Jim
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  #2  
Old 04-06-2013, 11:31 AM
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Re: Queston on Vortex scope w/BDC Reticle

Magnum rifles shoot flatter. So it absolutely makes sense to use a 200 yard zero for them since there is hardly any drop from 100-200 yards. Also, by zeroing at 200 yards, you are raising the angle of the bore ever so slightly, which helps reduce the bullet drop (measured from the 200 yard mark) compared to having a 100 yard zero.

The thing with BDC reticles is that the spacing of the hold over lines is not uniform. They have tried to come up with a "universal" set of reference points to give you "sensible" target distances. Its all a compromise.

I don't know if Vortex has an interactive tool to use for determining what the lines mean for different scope magnifications and bullet trajectories. Nikons is the "Spot On" tool. I personally found working with a SFP reticle to be a pain in the butt since the values are only calibrated for maximum magnification. I also prefer having "straight" uniform increments on the reticle, for example ever tic = 2MOA. That way I tape my drop chart to the rifle and know which bar to hold for which distance, without needing to memorize anything.
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Old 04-06-2013, 12:31 PM
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Location: Dillon Mt
Posts: 164
Re: Queston on Vortex scope w/BDC Reticle

On the Vortex home page there is the LRBC calculator which allows you to enter the data for your rifle and it calculates a drop chart off that. Another tab there gives the drops for their different reticules. That will give you a starting point to verify the actual drops for yours.

With a standard duplex reticule I sighted everything in at 2"high at 100yds, that keeps the high point in the trajectory no higher than 2". With some faster cartridges it can end up being a 250yd zero. That is just my preference to keep from hitting too high at closer ranges. The ballistic calculator will let you play with different trajectories so you can see what suits your type of shooting the best.

Cliff
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Old 04-06-2013, 02:20 PM
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Re: Queston on Vortex scope w/BDC Reticle

Quote:
Originally Posted by westcliffe01 View Post
Magnum rifles shoot flatter. So it absolutely makes sense to use a 200 yard zero for them since there is hardly any drop from 100-200 yards. Also, by zeroing at 200 yards, you are raising the angle of the bore ever so slightly, which helps reduce the bullet drop (measured from the 200 yard mark) compared to having a 100 yard zero.
So, are you suggesting that since there is very little drop from 100-200 yards, if I sight in at 100 yds., the hash marks for the longer ranges would not be that far off from what they would have been if I sighted in at 200 yds.?

Sorry if I seem to be a little dense at understanding this. But it's probably because I am.
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  #5  
Old 04-06-2013, 11:21 PM
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Join Date: Sep 2012
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Re: Queston on Vortex scope w/BDC Reticle

Quote:
Originally Posted by jsears View Post
Hello, all.

This is my first post here, and I'm hoping someone can answer my question.

I just traded for a Savage rifle in .204 cal. It came topped with a 6x18 Vortex Crossfire scope with Dead-Hold BDC reticle.

This is the first scope I have ever owned with a BDC reticle. There are a couple of things I don't quite understand about it.

First, the literature that came with the scope says to zero the main crosshair for "High Power Big Game Rifles" at 100 yards. But to zero the main crosshairs on a "Big Game Magnum Rifles" and "High Velocity, Small Caliber Varmint Rifles" at 200 yards.
I can't wrap my head around the reason for this. Can anybody enlighten me in layman terms?

Secondly, what would the results be if I did zero the main crosshairs at 100 yards rather than 200yards with the .204?

Most of my shots will not be much more than 300 yards, and more likely to be in the area of 150-200 yards. So I really don't need ability to reach out to 500 or so yards, especially with a lightweight like to .204. However, it would be nice should the shot ever present itself.

Can someone please help me out with this?

Thanks..

Jim
Here are the values for each line from their website:

1st: 1.5 MOA
2nd: 4.5 MOA
3rd: 7.5 MOA
top of thick: 11 MOA

Then you can match that up with the LRBC that was talked about above
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  #6  
Old 04-07-2013, 09:03 AM
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Re: Queston on Vortex scope w/BDC Reticle

How To Use the Vortex Dead-Hold BDC Reticle - YouTube
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  #7  
Old 04-07-2013, 09:38 AM
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Join Date: Mar 2013
Location: Jeffersonville, Ohio
Posts: 3
Re: Queston on Vortex scope w/BDC Reticle

Thanks to all of you for your replies. It's been a little windy for the past few days, so I haven't tried to mess with zeroing the little .204 yet. I'll just have to play with it and see what pans out.

Thanks again..

Jim
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