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Boone&Crockett ->Zeiss Rapid-Z ?'s

 
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  #1  
Old 09-27-2007, 10:26 PM
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Boone&Crockett ->Zeiss Rapid-Z ?'s

I am interested in some details on these type reticles ,here's my wonderings.

They come in different ? stages of reticles to match different performance levels of cartridges.
And you can set the gun to the reticle and all the hash marks ? how do you fine tune this set-up ?

Do you have to accept a possible higher or lower point of impact than normal at 100 yds -to get the 4-500yd reticles to work?

I can't figure out how the reticle system can be for -say a 243 -a 243 can shoot a 55gr bullet at 4000fps or a 105gr at 3000fps ,how do you set the reticle for the differing trajectories ?
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Last edited by ol mike; 09-28-2007 at 11:48 AM.
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Old 09-28-2007, 11:08 AM
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Ol Mike, You have hit upon the reason most of the folks on this forum like to
click rather than depend upon Ballistic Drop Compensating (BDC) reticles. I do
not necessarilly include myself in that category however. In the example you
used of the .243, you must first decide what you are going to use that gun primarily for. Varmits (ie. 55gr. bullet) or larger game/long range ( ie. 105 gr. bullet). Once you decide that, then you can choose, for example, the Leupold varmint hunters reticle/rapid Z varmint hunters reticle (55gr) or the Leupold B&C reticle/rapid Z 600, 800, or 1000yd reticle (105 gr. bullet) Most all BDC reticle scopes are made for a "class" of cartridges that exhibit very similar trajectory tracks. They will usually be very close and occasionally smack on. It is most important however, that if you choose to use one of these you zero the rifle where the manf. says to zero it, and then check it at all the yardages you intend to shoot. It is probably possible to alter your load in such a manner that it will fit the ballistic profile of your particular reticle perfectly. I cant imagine the amount of time and components that might generate though. Hope this long winded opinion helps.
Jim
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Old 09-28-2007, 11:14 AM
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A BDC reticle that works with any load and speed of bullet is the Nightforce MOA reticles such as the NPR-1 & NPR-2 reticles..........
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Old 09-28-2007, 12:35 PM
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MT4

I read a thread over on 24hr campfire about the B&C leupold ,from what i gathered you could fine tune at a reasonable point of impact.

If you are low on the longrange reticles [4-5 and 600 yard hash marks] -i guess you can go up a click or two [on your mpbr] then be very close or on the money at longrange.

That way you might have to remember that you are a little high in the middle of your mpbr ?

I just don't have any expierence w/ anything but a duplex reticle ,-i mostly predator hunt and coyotes don't stand and graze and give you lots of time to range and click.
Just keeping your eyes on a coyote in the sage brush at 350-400yds is a challenge.
So the idea of a reticle -where a hunter can laser-range the distance and place a reticle w/elevation and windage hash marks on a figety coyote would be great.

I just don't know if a set-up like this could be truly fine tuned to the point of not having to try to remember too much.

jwp475 -a nightforce is a little out of the budget for now -but i will do some rooting around on the site for the np-1 and 2
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Last edited by ol mike; 09-28-2007 at 12:45 PM.
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Old 09-28-2007, 04:05 PM
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Mike, I hear ya buddy, and I feel your pain. Nikon's version of a BDC reticle is,
interestingly enough, called the BDC reticle. It features circles below the center crosswire that decrease in size as the yardage increases. With the circle idea you actually have 3 separate points of aim for each circle, top, middle, and bottom. The sides of the circles can actually be used as hold offs for small windage corrections. The buckmaster line of Nikon's are very affordable. I have one of these and it is very easy to use. Maybe another idea?
Jim
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Old 09-28-2007, 05:38 PM
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ol mike-

The B&C reticle is made for either a 200 or 300 zero. The first hash mark is 300 yards @2.19 MOA or 6.8 inches drop, the second is 400 yards @ 4.80 MOA or 20.11 inches drop, the third is 450 yards 6.26 MOA or 29.5 inches, the last is 500 yards @ 7.82 MOA or 40.95 inches.

This data is from my leupold catalog that explains the reticle.

Running a 243 load thru Exbal shows that with a 200 yard zero, a 100 grain hornady at 3000 fps and 5000 ft. asl would almost perfectly match this reticle.

Also, a 243 shooting a 75 VMAX at 3000 fps would work real well for that B&C reticle... see below.

Sight Adjustments Needed
RANGE Elevation Windage Tgt Lead Elevation
(yd) MOA MOA MOA (in)
0 0.00 0.00 0.00 -1.5
50 -1.00 0.25 1.75 0.5
100 -1.50 0.75 1.75 1.5
150 -1.00 1.00 1.75 1.4
200 0.00 1.50 1.75 0.0
250 1.00 1.75 1.75 -2.7
300 2.25 2.25 2.00 -6.9
350 3.50 2.75 2.00 -12.7
400 4.75 3.25 2.00 -20.3
450 6.25 3.75 2.00 -29.8
500 8.00 4.25 2.00 -41.4


hope this helps you out. this is based on 5000 ft elevation.

Good luck
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Old 09-28-2007, 11:57 PM
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Don't get too hung up on the Group A,B or C thing. These reticles are valuable and can be spot on accurate with any cartridge, bullet, elevation combination if you do a little homework first. The reticle's hash marks are a set distance (MOA measurement) apart. I've got a VXIII 2.5-8 x 36mm with B&C on a .270 Win.

Leupold Boone and Crockett Reticle

Center reticle: Any zeroed distance
First Hash: 2.19 MOA (large triangle) 2.74 MOA (small triangle) 2.16 MOA (10mph drift)
Second Hash: 4.80 MOA (large tri) 6.00 MOA (small tri) 3.03 MOA (10 mph)
Third Hash: 6.26 MOA (large tri) 7.83 MOA (small tri) No windage mark
Top of lower Post: 7.82 MOA (large tri) 9.78 MOA (small tri) No windage mark


You can take any cartridge, bullet, elevation combination and the reticle can be accurate. For example: (ran on ExBal)

.243 55 gr Nosler Ballistic Tip Varmint (B.C 0.264) 4000 fps, 5000 ft., 59 F
With 8x scope on large triange (8X Zoom): 200 yd zero, 10 mph wind

Center Reticle: 200 yds Windage: 1.25 MOA needed
First Hash: 365 yds Wind Hash (2.16 MOA): just over 2.50 MOA needed
Second Hash: 509 yds Wind Hash (3.03 MOA): just over 3.75 MOA needed
Third Hash: 576 yds Windage needed: 4.50 MOA
Fourth Hash: 640 yds Windage needed: just under 5.25 MOA needed

.243 100 gr Nosler Partition (B.C 0.409) 3000 fps, 5000 ft, 59 F
with 8x scope on large triangle (8X zoom): 200 yd zero, 10 mph wind

Center reticle: 200 yds Windage: 1.25 MOA needed
First Hash: 308 yds Windage (2.16 MOA): just over 1.75 MOA needed
Second Hash: 411 yds Windage (3.03 MOA): just over 2.50 MOA needed
Third Hash: 466 yds Windage: just under 3.00 MOA needed
Fourth Hash: 520 yds Windage: just under 3.50 MOA needed

The windage for the 466 yds and 520 yds can be calculated very closely by using the second windage hash (3.03 MOA). If a guy knows the numbers for a given load, he can calculate any yardage in between pretty easily.

Exbal allows you to calculate yardages for any power magnification ballistic reticle for any chosen zeroed yardage if you know the hash mark separation. Other software may too, my only experience is with Exbal... it's the one I use.

Once you chronograph your load, just plug in the numbers and confirm them at the range. Usually Exbal is very close but sometimes a rifle needs 0.25 MOA more or less at a certain range.

Hope this helps a little.
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Last edited by Thor; 09-29-2007 at 01:01 AM. Reason: fix typo
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