New Posts New Posts RSS Feed - Question on Nikon BDC reticle
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

Question on Nikon BDC reticle

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/10/2007 at 11:28
Legs in the Air View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: November/08/2007
Location: Canada
Status: Offline
Points: 21

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.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/10/2007 at 21:54
sscoyote View Drop Down
Optics Journeyman
Optics Journeyman


Joined: October/05/2004
Status: Offline
Points: 326
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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/10/2007 at 22:02
Legs in the Air View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: November/08/2007
Location: Canada
Status: Offline
Points: 21

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?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/11/2007 at 17:21
sscoyote View Drop Down
Optics Journeyman
Optics Journeyman


Joined: October/05/2004
Status: Offline
Points: 326
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?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/12/2007 at 10:21
Brady View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
Casino Cruiser

Joined: May/20/2004
Location: United States
Status: Offline
Points: 1834

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.

 

 



Edited by Brady
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/12/2007 at 20:32
Legs in the Air View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: November/08/2007
Location: Canada
Status: Offline
Points: 21

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.....

 

 

 



Edited by Legs in the Air
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/14/2007 at 23:47
sscoyote View Drop Down
Optics Journeyman
Optics Journeyman


Joined: October/05/2004
Status: Offline
Points: 326

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

 

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



Edited by sscoyote
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2007 at 13:35
prosthogod View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: May/23/2007
Location: United States
Status: Offline
Points: 25
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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2007 at 15:25
Diana View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: November/09/2007
Status: Offline
Points: 41
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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2007 at 15:30
cheaptrick View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: September/27/2004
Location: South Carolina
Status: Offline
Points: 20479

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....

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2007 at 18:01
Legs in the Air View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: November/08/2007
Location: Canada
Status: Offline
Points: 21
Originally posted by cheaptrick cheaptrick wrote:

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?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/15/2007 at 18:18
cheaptrick View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: September/27/2004
Location: South Carolina
Status: Offline
Points: 20479

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.

 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "Question on Nikon BDC reticle"
Subject Author Forum Replies Last Post
Nikon BDC reticle question koshkin Rifle Scopes 34 3/29/2007 2:30:40 AM
Nikon BDC question, and suggested use Majja Rifle Scopes 0 2/8/2007 5:33:45 PM
Nikon BDC Reticle Chris Farris Rifle Scopes 10 7/14/2006 6:11:01 PM
Nikon Omega BDC Reticle DAVE44 Rifle Scopes 3 8/29/2006 8:03:10 PM
Nikon Omega BDC Reticle jd1234 Shotgun / BlackPowder Scopes 0 10/25/2006 10:38:29 AM
Nikon new BDC reticle encoreguy Varmint Scopes 3 4/13/2006 8:39:45 PM
Nikon new BDC reticle encoreguy Rifle Scopes 5 3/14/2006 12:27:10 PM
Nikon prostaff BDC vs Truglo BDC ghost82 Rifle Scopes 1 10/22/2007 4:06:27 PM
Torn between BDC dials and BDC reticles 70snickers Tactical Scopes 17
Burris B-plex or Nikon BDC ksbarter Rifle Scopes 15 5/29/2006 11:18:32 PM


This page was generated in 0.125 seconds.