Vortex Viper Info

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Vortex Viper Info

Post by Pedro » 06 Apr 2021, 9:24 am

i have recently purchased a vortex viper and was hoping someone could tell me what distance they find works for them regarding the hold over dots
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Re: Vortex Viper Info

Post by Larry » 06 Apr 2021, 10:05 am

It is going to depend on the calibre and the MV, weight and BC of the bullet. Do you have the specs of the reticle?
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Re: Vortex Viper Info

Post by Pedro » 06 Apr 2021, 1:22 pm

6.5 x 55 - MV 2100
Reticle - Dead Hold BDC-PA
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Re: Vortex Viper Info

Post by in2anity » 06 Apr 2021, 2:44 pm

2100fps seems a bit slow? Is it a carbine?

Here's what I came up with:

subs.jpg
Reticle - Dead Hold BDC-PA
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For your load:

ballistics.jpg
140gr, 0.65g1, 2100fps
ballistics.jpg (201.33 KiB) Viewed 182 times


Remember, the further the target, the harder it is to estimate distance, and the harder it is to precisely "hold-over" so to speak. A small mistake might yield a complete miss. For long shots, where you potentially have more time to calculate, it makes more sense to range, strelok, then "dial-in".

I can use a 22lr BDC fairly well, but that's because it's significantly easier to guesstimate 50m/75m/100m vs say for example 230m/270m/300m (without using a ranging device).
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Re: Vortex Viper Info

Post by bladeracer » 06 Apr 2021, 6:14 pm

Pedro wrote:i have recently purchased a vortex viper and was hoping someone could tell me what distance they find works for them regarding the hold over dots


Need to know your bullet's BC and your muzzle velocity.
And we need to know the reticle graduations.

I use 223BDC for all cartridges.
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Re: Vortex Viper Info

Post by bladeracer » 06 Apr 2021, 6:22 pm

As In2anity said, 2100fps is quite low for the 6.5x55mm.

Using the subtensions he posted:
100m zero
1.5MoA=142m
4.5MoA=211m
7.5MoA=272m
11MoA=341m

I would zero at 200m (120mm high at 100m):
200m zero
1.5MoA=233m
4.5MoA=294m
7.5MoA=350m
11MoA=412m
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Re: Vortex Viper Info

Post by bladeracer » 06 Apr 2021, 6:24 pm

Remember also, those holdovers only work on 20-power.
If you turn the zoom to 10-power the subtensions will double to 3MoA, 9MoA, 15MoA and 22MoA.
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Re: Vortex Viper Info

Post by Pedro » 06 Apr 2021, 6:47 pm

Thanks so much everyone a lot of info for me to think about then put into play
cheers
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Re: Vortex Viper Info

Post by SCJ429 » 06 Apr 2021, 7:25 pm

You seem to have lost about 800 fps somewhere.

I would dial your turrets to get on at various distances, if you cannot do that because you don't have time, then shoot at the distances you know and compare which mark corresponds to where your bullet landed. Write these down until you can memorise them.
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Re: Vortex Viper Info

Post by bladeracer » 06 Apr 2021, 7:50 pm

SCJ429 wrote:You seem to have lost about 800 fps somewhere.

I would dial your turrets to get on at various distances, if you cannot do that because you don't have time, then shoot at the distances you know and compare which mark corresponds to where your bullet landed. Write these down until you can memorise them.


Agreed, for precision it's always better to dial your elevation to match the range and hold dead-on.
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Re: Vortex Viper Info

Post by in2anity » 07 Apr 2021, 9:59 am

That reticle is far more appropriate for a 140gr @ 2700fps, i.e. a factory/power 6.5cm load. 100yd=0, 200yd=1.6moa, 300yd=4moa.

Nevertheless if your rifle is indeed the venerable 6.5 x 55mm Swedish Mauser, 36gr of AR2208 under that 140gr Nosler will yield somewhere between 2500 to 2600 fps. Then just zero her at 130yds, making the first subtension match 200yds, and second subtension match 300yds. Then anything under ~150yds; just point-and-shoot!

Only practice will perfect its usage, but it should be a great hunting rifle that could really reach out there. The 6.5x55 is hugely popular in our Service Rifle club (for obvious reasons); an excellent "wind bucker" out to 300m.
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