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Leupold Boone & Crockett

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marlboroninja View Drop Down
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    Posted: August/02/2005 at 11:43
Leupold states that their Boone and Crockett reticle is compensated for rounds similar in performance to the .270.  When they say similar how similar does the round have to be for the Boone and Crockett reticle to accuratley compensate for trajectory?   Specifically, will this reticle perform well on a Remington 7mm Magnum (.284)?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stud Duck Quote  Post ReplyReply Direct Link To This Post Posted: August/02/2005 at 13:07

Go to Leupold's web site and click on the "hunting" tab. On the left side of the page ( 7th up from the bottom) you will find a link titled "BAS (Ballistic Aiming System) Training", this link will take you to an interactive simulator using the B & C reticle.

 

Here you will find a bullet drop chart for calibers ranging from .223 to .338 Win Mags. You will find that a 7mm Mag is in group three and where to zero your rifle with this particular reticle.

 

I highly recommend that you utilize this tool to familiarize yourself with this particular reticle. It's not as complex as one might think.

 

And, as Leupold states at the end of the training "practice, practice, practice".

 

If you need more help, let me know.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote marlboroninja Quote  Post ReplyReply Direct Link To This Post Posted: August/02/2005 at 13:27
Nice!  Thanks alot.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marlboroninja Quote  Post ReplyReply Direct Link To This Post Posted: August/02/2005 at 14:21

Two scenarios:

 

First

Say I purchase 140 grain Winchester AccuBond CT bullets.  According to Winchester, firing from a Remington 7mm Mag, these bullets have a muzzle velocity of 3180 fps.  Because I am shooting more than 3100 fps I locate Remington 7mm Mag in Group C on the Leupold chart.  Because the actual velocity of the bullet that I am shooting is closest the the velocity listed in Group C I zero the "main" reticle at 300 yards using the large triangle?

 

Second

Say I purchase 160 grain Winchester AccuBond CT bullets.  According to Winchester, firing from a Remington 7mm Mag, these bullets have a muzzle velocity of 2950 fps.  Because I am shooting less than 3050 fps I locate Remington 7mm Mag in Group A on the Leupold chart.  Because the actual velocity of the bullet that I am shooting is closest to the velocity listed in Group A I zero the "main" reticle at 200 yards using the large triange?

 

Is this correct?  Am I correct in saying you determie which Group and triangle to use based on the velocity of the actual bullet you are firing?

 

If the above is correct, say I choose the 140 grain bullet and zero the "main" reticle at 300 yards.  What happens when a target offers a shot at say 150 yards.  Am I supposed to hold under?  If so, by how much?

 

If I expect to take most shots under 300 yards should I opt for the 160 grain bullet and zero the "main" reticle at 200 yards?

 

 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Top Cat Quote  Post ReplyReply Direct Link To This Post Posted: August/02/2005 at 18:02

Are you familiar with the concept of determining Maximum Point Black Range, or MPBR? It makes range estimation much simpler. 300 yards is short range for that caliber, and within the MPBR.

 

Using the MBPR concept, setting a 260 yard zero will enable either of those loads to strike within 3" of your point of aim, high or low, out to about 310 yards.

 

In other words, no adjustment for range would be necessary for any shot within 300 yards.

 

TC

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