Ranging with Viper BDC?

[fnberzerker]

Hey all! Just wondering if anyone has had any experience, whether successful or not, with ranging from a bdc reticle. I know the subtensions, and can try to figure it out, BUT it is definitely not like having a hashed out reticle. The subs are in MOA, and are spaced as follows (from top to bottom): crosshair, 1.5, 4.5, 7.5, 11, with none above the crosshair. Any ideas?

 

[DPRoberts]

Re: Ranging with Viper BDC?

If your BDC is the same as mine it has 4 mils worth of measurement on the horizontal crosshair. With that you can mil most small targets or turn it to half power and double the measurement. Just measure the width of a known size target and plug it into the mil ranging formula.

 

[roggom]

Re: Ranging with Viper BDC?

I tested mine out. There is an 18"x24" sign 427Y away from my window, and I measured right at the top of the 4.5 moa dot (4.2 moa)

18x100/4.2 = 428.5 badda bing. So you can do some calcs for deer(18"), Antelope (14") Elk (24")

Here is the manual for that reticle.

http://www.eurooptic.com/PDF/vortex-deadhold-bdc-reticle-manual.pdf

http://www.vortexoptics.com/uploads/web_manual_dead-hold_hashmarks.pdf

 

[fnberzerker]

Re: Ranging with Viper BDC?

CRAP!! I totally forgot about the mil values in the horizontal!! Thanks a bunch!

 

[fnberzerker]

Re: Ranging with Viper BDC?

Awesome, thanks Roggom! That helps a bunch too!

 

[RFutch]

Re: Ranging with Viper BDC?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DPRoberts</div><div class="ubbcode-body">If your BDC is the same as mine it has 4 mils worth of measurement on the horizontal crosshair. With that you can mil most small targets or turn it to half power and double the measurement. Just measure the width of a known size target and plug it into the mil ranging formula.

</div></div>

So the horizontal line is in Mils and the vertical is in Moa???

 

[roggom]

Re: Ranging with Viper BDC?

Yes it is, the Deadhold reticle is totally badazz. Links to manuals ^^^^^

 

[sscoyote]

Re: Ranging with Viper BDC?

Just use any of those subtensions in the mil-ranging formula. Suppose you chose the 4.5 IPHY mark to range a 10" tgt.--

10x100/4.5/1.0 [tgt. gaps at 100% or 1.0 "mil-reading"]=222

now just finish the dope sheet--

1000/4.5/0.9=245
222/.8=275
etc.
It's also good to know that the 1.5 IPHY mark is right at the .3 mil-reading [1.5/4.5=.3]. This helps a bit for interpolating your mil-readings.

 

[sscoyote]

Re: Ranging with Viper BDC?

Just noticed that the marks are in MOA so the 4.5 MOA would then be 4.5x1.0472=4.71 IPHY.

 

[fnberzerker]

Re: Ranging with Viper BDC?

awesome, thanks guys! I will have to go try my luck with it!!