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Burris Ballistic Plex ???s

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/01/2005 at 10:32
Firehawk View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: July/25/2005
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Points: 10

So I have purchased the Burris Signature Select 3-10x40 with Ballistic Plex.  I have sighted in at 100 yards at 1.5" high while on the highest setting.  I am shooting a 7mm Rem Mag with a 160 grain Nosler Accubond at approximately 2950 fps.  Here is my question:

 

Do I always have to shoot at the highest scope setting?  Will the ballistic plex still work at say 4x or 6x?  According to the charts that came with the rifle, I should be very close to POI at 300, 400, 500 and 600 yards by using the appropriate posts.  That said, I will never shoot at 600 yards at all, and only at "targets" at 500 yards.  At 400 yards though, I can make that shot on game animals as I have done a few times in the past.  I will always try to get closer if possible as 400 yards is still a very long way out there.

 

But....at 200 yards, I can make an easy shot at 4x or 6x with a scope, What will happen with the scope set at these ranges with the ballistic plex reticle?

 

Thanks in advance for your advice.  I appreciate the huge amount of experience that you all have to offer us.

 

Firehawk

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/01/2005 at 13:08
ranburr View Drop Down
Optics Master
Optics Master


Joined: May/16/2004
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You have to use the Ballistic Plex at max magnification because of the second focal plane.  Also, the system is designed for you to zero dead on at 100 yards.  If you are 1.5" high at a 100 yards, you will need to throw out the predetermined holdover ranges. 

 

ranburr

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/01/2005 at 15:24
Firehawk View Drop Down
Optics GrassHopper
Optics GrassHopper


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Actually Ranburr,

 

When sighting in a Magnum caliber such as mine, they (Burris) suggest a 200 yard zero which is why I sighted at 1.5" high at 100 yards.  This is exactly as there card suggests me to do with the prescribed load.  If I were loading a "standard" caliber or a 175 grain load from my cartridge, then they suggest the 100 yard zero as you mentioned. I should have mentioned this in my original post.  I suppose the real questions are in the 250-450 yard range. 

 

Explain to me the second focal plane issue please.  If this is the case, why would the regular crosshair not change through the power range as well?  Is this because the crosshair is at the exact middle always whereas the hash marks may vary?

 

Thanks again!

 

Firehawk



Edited by Firehawk
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/02/2005 at 18:26
climber View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: October/02/2005
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According to the Exball program, on 6X with 200 yd zero your POI's would be Bar1=311yds zero (Min range 242 Max 354) Bar2= 485yds Zero(457Min range Max 509yds) Bar 3= 630 yds zero (612 Min range Max 646yds) Bar 4 =774 yds zero (762yds min range Max 785 yds) The Min and Max are for an 8 inch kill zone.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/03/2005 at 09:04
Brady View Drop Down
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Casino Cruiser

Joined: May/20/2004
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With second focal plane scopes the reticle stays the same size when the power is magnified. The reticle will increase in size with first focal plane scopes. A bullet drop reticle can be used on all powers with FFP scopes because the reticle will grow in size in relation to the target. The spacing will constantly be the same. With a SFP scope the spacing is only correct on one power. The power which it is calibrated for. The FF2's are calibrated on the highest power so they will have to be used on that power. You won't be able to use the ballistic plex on all calibers because the spacing between the hold over marks will not be correct.

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