Print Page | Close Window

Question on Nikon BDC reticle

Printed From: OpticsTalk by SWFA, Inc.
Category: Scopes
Forum Name: Rifle Scopes
Forum Description: Centerfire long gun scopes
URL: http://www.opticstalk.com/forum_posts.asp?TID=8447
Printed Date: March/29/2024 at 05:40
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com


Topic: Question on Nikon BDC reticle
Posted By: Legs in the Air
Subject: Question on Nikon BDC reticle
Date Posted: November/10/2007 at 11:28

Curious as to what moa applies to the circles in the bdc.

 

In other words, how big would the circle appear on your target at different yardages/magnifications.

 

Thanks in advance.



-------------
Just 'cause there's clouds on the horizon doesn't mean it's gonna rain...



Replies:
Posted By: sscoyote
Date Posted: November/10/2007 at 21:54
According to the catalog the inside diameter is 1.5 inch per hundred yds. If that's in a 3-9X, then if the power is cranked down to 4.5 it'd be roughly twice that. Subtension vs. magnification is inversely proportional.

-------------
Steve


Posted By: Legs in the Air
Date Posted: November/10/2007 at 22:02

If I understand correctly, you're saying at max magnification (in your eg. 9) the inside of the ring equals 1.5 inches at one hundred yards. And at half that (4.5 power) it would be 3 inches at one hundred yards?



-------------
Just 'cause there's clouds on the horizon doesn't mean it's gonna rain...


Posted By: sscoyote
Date Posted: November/11/2007 at 17:21
Yes--It should be very close to that measurement (assuming the power ring is calibrated properly). As magnification DECREASES subtension INCREASES (inversely propotional). What r u trying to do with the reticle?

-------------
Steve


Posted By: Brady
Date Posted: November/12/2007 at 10:21

Definitely small enough to be surprisingly accurate. I had a chance to shoot one from 100-500 yards and had a lot of success. The circles allow you to still see your target while still being able to make an accurate shot.

 

Scanned a page out of Nikon's catalog.

 

 



Posted By: Legs in the Air
Date Posted: November/12/2007 at 20:32

Originally posted by sscoyote sscoyote wrote:

Yes--It should be very close to that measurement (assuming the power ring is calibrated properly). As magnification DECREASES subtension INCREASES (inversely propotional). What r u trying to do with the reticle?

 

 

Would be used on a .22-250 for coyotes.

 

Am thinking that this reticle would work well for ranging on coyotes, similar to mildot.

 

Thanks for the measurements, I'm new to this but I enjoy the science of applying these scopes as tools of the trade.....

 

 

 



-------------
Just 'cause there's clouds on the horizon doesn't mean it's gonna rain...


Posted By: sscoyote
Date Posted: November/14/2007 at 23:47

I also apply reticles for rangefinding on coyotes, but i've never had the need for it yet. I still calculate a system that's based on the mil-ranging formula tho. A discussion of which is right here--

 

http://opticstalk.com/forum_posts.asp?TID=8458&PN=1 - http://opticstalk.com/forum_posts.asp?TID=8458&PN=1

 

I've been looking at that reticle myself for rangefinding, and it presents a lot of possibilities. The circles would actually work very similar to Leupold's RES system they use for a deer-size tgt. (only 11" back to brisket coyote instead of the 16" deer std. they use), but IMO there is another system that would work quicker, and u don't need to adjust the power ring to make it work...but it defintiely isn't as flashy as using the circles and adjusting the power ring. After looking at the stats on that reticle here's what i'd do. By applying the modifed mil-ranging formula noted in the link above u could use the top of the last dot, and the lower post tip for a subtension of 5 inch per hundred yds. (IPHY). Here's how that would work using the "MMR", and 11" for a back to brisket avg. coyote--

 

11 x 100 / 5.0 / 1.0 = 220 yds. (coyote fits pefectly between top of dot, and post tip)

 

220/.9=245

220/.8=275 (actually this would be the center of the dot when the brisket is right on the bottom post, since the center of each dot is exactly 1 IPHY from the top or bottom of the dot, [ 5-1 = 4, 4/5 = .8]

 

220/.7=315

220/.6=365 (this reference is the bottom of the dot [5-2=3, 3/5=.6]

220/.5=440

220/.4=550 (too far for accurate ranging now as .1 interpolation produces 110 yds. of range).

 

Do u see how this works??

 

Here's what the range sticker would look like--

 

TD #4-Post-220 (top dot #4 to post)

.9-245

CD-275 (center of dot)

.7-315

BD-365 (bottom of dot)

.5-440



-------------
Steve


Posted By: prosthogod
Date Posted: November/15/2007 at 13:35
I don't have numbers for you, just personal experience. Rem. 7mm mag 150grain sited in at 100yrds. Then at 200 went to the first drop circle. Too mech. Went back to the original cross hair and was still sited in. Went to 400yds and went to the first drop and it was just slightly low. At 200yds very clear and a pattern about size of a grapfruit. At 400yrds= the same.

-------------
live everyday like your last


Posted By: Diana
Date Posted: November/15/2007 at 15:25
Last weekend, I took a road trip to South Dakota, my friend just purchased this Nikon scope. Its a dandy! He did let me look at it.... from a distance... very stingy.


Posted By: cheaptrick
Date Posted: November/15/2007 at 15:30

http://www.swfa.com/pc-8769-218-new-nikon-4-16x42-monarch-riflescope.aspx - http://www.swfa.com/pc-8769-218-new-nikon-4-16x42-monarch-ri flescope.aspx

This will probably be my next scope. Can't make up my mind between the BDC or the Mil Dot though....

 



-------------
If at first you don't secede...try..try again.


Posted By: Legs in the Air
Date Posted: November/15/2007 at 18:01
Originally posted by cheaptrick cheaptrick wrote:

http://www.swfa.com/pc-8769-218-new-nikon-4-16x42-monarch-riflescope.aspx - http://www.swfa.com/pc-8769-218-new-nikon-4-16x42-monarch-ri flescope.aspx

This will probably be my next scope. Can't make up my mind between the BDC or the Mil Dot though....

 

 

That's a beauty, and yes it is a tough decision between bdc and mildot.

 

I'm considering a 4.5-14X40 buckmaster (either bdc or mildot), what's your opinion of that model?



-------------
Just 'cause there's clouds on the horizon doesn't mean it's gonna rain...


Posted By: cheaptrick
Date Posted: November/15/2007 at 18:18

I owned an older 4.5-14x40mm Buckmaster, but it had the Nikoplex reticle.

The poor thing was mounted on a .300 RUM Sendero. POI never moved on that beast either. I expected so little from that scope and got a lot in return.

 

I believe the BM's out now are a little better optically due to a coatings or glass upgrade. 

The BM is a nice scope FOR THE MONEY, but the Monarch will out perform it at every turn.



-------------
If at first you don't secede...try..try again.



Print Page | Close Window

Forum Software by Web Wiz Forums® version 12.01 - http://www.webwizforums.com
Copyright ©2001-2018 Web Wiz Ltd. - https://www.webwiz.net