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Author Topic: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help  (Read 927 times)

Offline SeatoSummit88

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Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« on: October 21, 2020, 02:00:44 PM »
Does anyone else have this scope with the CDS dial mounted?

I am wondering if I did my ballistics calculations correctly. Won't be able to shoot until another week or so, but would like to make sure that the numbers I used were accurate.

Drop (inches) Divided by MOA Times 4  = closes whole number for # of clicks (1/4 inch per click)

My example: altitude set 500 feet. Avg temp 50. wind 5-10. 
shooting 180 grn Federal Premium trophy bonded tips. 2960 muzzle velos.   .474 coefficient
100 yds sight in.

Says that 200 yards: Drop= -3.1
                               MOA= -1.5
3.1 / 1.5 = 2.06 (round to 2) Multiply by 4 = 8..    So 8 clicks Up would get me dialed at 200 yards.


Did I do this correctly.
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Offline headshot5

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #1 on: October 21, 2020, 02:51:02 PM »
Something is off with your calculation.


Here is how i do the math...  It's a little easier with a sketch, but bear with me. 

I always take my drop at distance and change it from inches to inches per hundred yards and then factor in that one click at 100 yards is 1/4" (depending on the scope).

Example...

so similar numbers to yours assumed at 500 yards gives you something like 46.5" of drop.

So take that and divide it to make inches per 100 yards.  So at 500 yards is 5, 100 yard increments  So in this case it would be

46.5 inches/5 = 9.3" per 100 yards. 

Take that 9.3" at 100 yards and multiply it by 4 as there are 4 clicks to an inch at 100 yards.

That gives you 37.2 clicks.   So 37 clicks is what you dial at 500 yards.  You can check your math with the following....  At 500 yards each click is 1.25" (that is .25" multiplied by 5) so 37 clicks * 1.25" gives you 46.25".     


In your 200 yard example it would be as follows.

   
3.1"/2 = 1.55 inches/hundred yards.   1.55 X 4 = 6.2 clicks.   so 6 clicks.   If you consider that a click at 200 yards is twice as big as it is at 100 yards and you dial 6 clicks  X .5" per click gives you 3 inches at 200 yards which is your drop. 

Let me know if that is confusing.  without a sketch the math is a little hard to explain.



Offline SeatoSummit88

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #2 on: October 21, 2020, 03:03:51 PM »
I got a F****'n  D in Math...So you could be easily explaining it to me, but you are correct...If I don't see it physically I am slow to learn...

I feel like I am close... I watched a youtube video from a guy who was dialing in the same scope, but, diff ballistics due to using noslers...

Maybe we can touch base separately from here and you could send me a photo of your chart?

I went on Leupold's site, loaded my data and it provided drop in inches (for 100 yd sight in).. MOA.... MIL... and other info.

The guy online said you want to take  your Drop Divide it by MOA and  then take that number and multiply it by 4, because of the 1/4 inch click rule. (my Leupold scope carries that rule, 1 click is 1/4 inch)

 
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Offline spoonman

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #3 on: October 21, 2020, 03:23:18 PM »
Is the muzzle velocity  verified or is that the stated velocity on the ammo box? If you are going off the box you are most likely going to off from the get go.

Offline SeatoSummit88

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #4 on: October 21, 2020, 03:41:50 PM »
dang it. Yeah it's from the box. But what's interesting is that Leupold didn't ask me that, however that number ended up on my return email with the general info.
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Offline spoonman

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #5 on: October 21, 2020, 03:48:25 PM »
So not sure what round you are shooting or what rifle and what length barrel but that all makes a difference and no two rifles shoot the same velocity so verifying the velocity is crucial when it come to the CDS dials or dialing a regular dial for that matter.

Offline X-Force

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #6 on: October 21, 2020, 03:51:57 PM »
Is this an in graved CDS with your ballistics or the turret that comes with the scope?

As spoonman stated if you use box ballistics your going to be off.

Personally I would zero at 200 then your 100 would be a negligible difference.

Lots of guys on here with better expertise than me.

Correct answer to your question is 6. MOA increases as distance increases roughly 100=1/4 200 1/2 300 3/4 400 1.
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Offline SeatoSummit88

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #7 on: October 21, 2020, 04:01:03 PM »
Oh man! I'm kind of freaking out right now. I need this to shoot straight for me come late season. What do I need to do? Spoonman or anyone else. Willing to pay or throw beer or whatever you need to help me out so I can learn the correct way. I have been doing this all myself, as I don't have anyone I know that uses dials and usually hunting solo...

Shooting Tikka T3 Lite.  In 300 Win Mag.  Blued Barrel. Muzzle Break.
              Federal Premium: Trophy Bonded Tip  180 Grain Round.
Leupold VX3 4.5 14 40

Dial was etched with round, elevation, temp, etc.

Dial starts with 1 and highest is 6.  hashes inbetween.

My cell is 360 591 5004, if there is anyone willing to help straighten me out, man I'd be grateful.
I live right down the road from Kenmore Gun Range.

Matt
If I'm not selling, I should be hunting, If I'm not hunting, I should quit!

Offline BULLBLASTER

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #8 on: October 21, 2020, 04:23:37 PM »
When you get to shoot zero at 100 yards. Then work out to 400-500 watching for elevation of impacts. Use the dial markers as a starting point then correct as neccesary. If its off a bit just sight in at the furthest range you can. It will be off a bit closer but less than of it was zeroed closer.

Its easier to just think in moa instead of inches but that isnt so easy without an moa reticle

Offline Harleysboss

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #9 on: October 21, 2020, 04:47:10 PM »
Matt, good luck. Hope our phone conversation cleared things up for you. Aim small miss small!!

Offline Stein

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #10 on: October 21, 2020, 04:48:20 PM »
You shouldn't have had the dial made until you verified your velocity and drop.  But, you did so I would work with that.  The numbers on your dial are the yardages from 100 to 600.

I would take it to the range, dial it to 1 and then zero that in at 100.  Then, dial to 200 and shoot at 200 to make sure it's on.  Then, go to 300....until you run out of room at the range.

If you gave them the velocity off the box and the correct bullet info you should be close, but how close is unknown until you check it out.  Leupold makes them based on the info you give them so if you give them good info they will send you a dial with good numbers.

Also keep in mind the dial is for a particular elevation, temperature, bullet and muzzle velocity.  If you change any of those the dial won't be on.  Them more you change the more it will be off.

Offline SeatoSummit88

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #11 on: October 21, 2020, 08:46:11 PM »
Appreciate everyone's feedback! Brett, I appreciate you giving me a call. I feel way more confident now. The best thing I can go do is sight in. Kenmore is 100 yard max, so ill have to find a place that stretches out to 300 yds or more..If anyone has suggestions of places/ logging roads/ fs roads that are within 45 min or so of the Bothell area, please let me know!
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Offline highside74

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #12 on: October 21, 2020, 09:08:43 PM »
Good thing is they can always make you a new dial just not for free. A 200 yard zero would be much more appropriate for a 300 and knowing the actual velocity of your gun before ordering the dial will be way more accurate.  Good luck
« Last Edit: October 22, 2020, 07:29:14 AM by highside74 »

Offline SeatoSummit88

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #13 on: October 22, 2020, 07:13:04 AM »
Thanks highside for the advice as well. I have heard a couple of people mention my Zero @ 200, rather than 100. You are correct, worse case scenario is that I have Leupold make me another dial. I might need to do that, maybe after this season. I'll put some rounds down range and see what happens beforehand
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Offline Stein

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Re: Leupold VX-3 4.5 x 14 x 40 CDS Dial Help
« Reply #14 on: October 22, 2020, 07:25:14 AM »
For a stock dial that has a zero stop, I would zero at 100.  You can easily dial to 200 yards, but if you zero at 200 yards you can't dial to anything less.  So, if you have a zero at 200 and the animal is at 100 you have to mentally know where to aim as you can't dial anything under 200.

With a CDS dial, there really isn't a "zero" as there is no zero on the turret like there traditionally is with a normal dial.  You dial for whatever yardage you want to shoot.  The first number is usually "1" and that is where the stop is set, so you can go up but not down.

 


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