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What ballistic program to use with MOA base?

RangeMe

Hello all!

I have a CZ 457 with a 25 moa base and a Athlon Helos Btr 4-20x, 30mm optic. The rig has been zeroed to 50 yards but StrelokPro does not seem to be making accurate conclusions to the data input in.
Also, and suggestions on why StrelokPro doesn’t have the Athlon Helos btr in mill? Only MOA.

Signed confusing enthusiasts …

Mark
 

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Program has nothing to do with a MOA base. Either the data being put in is off or it's just as close as it will get as programs are not always 100%. You can run data on JBM and compare. Make sure to check all your inputs including scope height and the environmentals. Sight height measure center of bolt/bore to center of Windage knob. Will be all you need.

JBM - Calculations - Trajectory (Simplified)

jbmballistics.com
 
I've noticed differences in ballistic results from Strelok Pro if the zero distance is closer than that recommended for the scope in question.
In this case you may try zeroing at 100 yards.

As for mil vs moa, contact Strelok.
 
Is your bullet crossing the line of sight the first time at 50 yards or are you in + ( over the line of sight ) and dropping in to 50?
If your set up is still climbing at 50 that would F it up.
 
Jeff Porter said:
Is your bullet crossing the line of sight the first time at 50 yards or are you in + ( over the line of sight ) and dropping in to 50?
If your set up is still climbing at 50 that would F it up.
Click to expand...
50 is a good zero with room to spare, though I’m frustrated with not knowing the drop at 100. I can dial it, but I’m lost for a source in accurate mills to correspond as StrelokPro tells me the inches, but the clicks are not corresponding … at all.
Athlon Helos in mill isn’t an option for plugging it in. Only moa, which I didn’t think would be a problem … but it’s kicking my ass for some reason.
Thanks for the input and I’ll let everyone know when I figure it out.
 
I just started using the same app myself. Look and see if the reticle is the same in another model and if it is in mils.
I did this on some glass they didn’t have listed (it is an older piece of glass, state of the art for the period,but some what dated) I checked it and it worked great so far. All the come ups at various ranges were good.
 
I'm curious what you mean by it not giving you a correction in mils. It gives me MOA, MRAD, Inches, and clicks.

Are you trying to use your reticle for hold over/drop? It is in the app, just not listed with your scope model. You can just choose another model with the same reticle (APRS6) and it will work just the same. You can also email him and I'm sure he will add it for your scope model in the next update.
 
I would try selecting an Athalon scope that is in your in Strelock library as a mil scope and give that a try. MRAD is in the second column. In settings set Strelock to give results in 1¾ format instead of clicks. This is much easier to keep up with. See the internet for videos on how to set Strelock up.

Finally, if necessary, hit the button that is labeled MOA/MIL and run a conversion.
 
Two suggestions to make sure neither one is a problem.

Double check sight line height above bore line.
Double check scope click values versus advertised.

The shorter the zero distance, the more sensitive you are to the scope height above the bore.

Also, many scopes have click values that are not calibrated. It takes little work to verify the click values are as marked.

If those work out to be correct, then I would double check the ballistics with a second solver and check your velocity. If the velocity is correct, then just true the ballistic coefficient by matching the actual bullet drops you are observing.
 
I have been using Strelok Pro for years and the vast majority of time it is a misperception or "operator headspace" issue on my part. I have scope and iron sights that use MOA, SMOA, and MRAD and use Strelok without issues. I perceive you may have a Strelok setup issue. I suggest you send the file named -> rifles.srl <- to someone to double-check your work.
 
The problem here is the scope base cants the scope below the bore line by 25 moa so unless there is a soft ware value for the variation in bore to optic level, than I can’t seem to see how Ballistic software will help?
Does this make sense?
Thank-you in advance.
 
Conaso said:
I have been using Strelok Pro for years and the vast majority of time it is a misperception or "operator headspace" issue on my part. I have scope and iron sights that use MOA, SMOA, and MRAD and use Strelok without issues. I perceive you may have a Strelok setup issue. I suggest you send the file named -> rifles.srl <- to someone to double-check your work.
Click to expand...
My experience for the last 10 years has been like yours but with this 25 MOA scope base it changes everything between bore and scope line. Sort of an anomaly that I cannot seem to find a place to input the base 25 mOA data with strelock?
Am I making sense?
Thank you kindly,
 
RangeMe said:
The problem here is the scope base cants the scope below the bore line by 25 moa so unless there is a soft ware value for the variation in bore to optic level, than I can’t seem to see how Ballistic software will help?
Does this make sense?
Thank-you in advance.
Click to expand...

No. The base cant has nothing to do with the program. I have used 20 MOA bases for decades and also use 40 MOA bases. No issues getting ballistic programs to work. There is something wrong with your inputs or the way you have the program set up. It is not the base.
 
Well that certainly helps here. I appreciate your input. The scope option with StrelokPro is only available in MOA and I thought the software would make the adjustments but the adjustments are way off.

I picked a different scope that was a mill scope similar to the helos BTR and it seems to be playing nice but I haven’t shot the new click adjustments yet.

Does that sound like something that makes sense to you?
 

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I agree with Rob01, the droop of the scope rail does not come into play in the ballistic solver. Only the height of the sight line (scope center) above the bore line matters.

The assumption is you have an initial target zero at some distance, and that if your scope doesn't have enough internal travel, that you won't be able to zero. But, the ballistic program doesn't care.

If you go out to distance, there is always an angle between the line-of-sight and the bore line. Go out farther, and you likely need to use a periscope or side view when the barrel elevates into the sight line. As long as you get it there, the ballistic program doesn't care if that came from turrets or tilt in the rail, etc., it only matters what the height of the scope above the bore is, and what zero distance you started with.

At shorter zero distance and especially if the scope height input is not accurate, there is more sensitivity to errors. A scope that is canted on a drooper mount does have small differences in height from the front to the back. I recommend taking the average of the heights between the mount saddles or at the turret as a starting point.

I would then run the tall target tests and verify the click value. No sense in burning rounds at distance for trueing unless your scale factors are correct to begin with.
 
RangeMe said:
Hello all!

I have a CZ 457 with a 25 moa base and a Athlon Helos Btr 4-20x, 30mm optic. The rig has been zeroed to 50 yards but StrelokPro does not seem to be making accurate conclusions to the data input in.
Also, and suggestions on why StrelokPro doesn’t have the Athlon Helos btr in mill? Only MOA.

Signed confusing enthusiasts …

Mark
Click to expand...
Just an idea...
Go to the scope set-up page in Strelok and change the scope click units to "cm@100 meters". Then change the "Vert. click,cm@100meters" to 1.0. Change "Hor.click.cm@100meters" to 1.0.
This should overide the pre-set factory values of the MOA scope. May not help you out, but worth a try. Otherwise, email Igor at Strelok with the scope's specifications and I'm sure he will include it. Usually responds quickly.
 
And don't forget, Strelok uses the objective lense for scope height.
Not in the center over the action.
1/2 objective diameter plus 1/2 barrel diameter under objective. Plus distance from barrel to bottom of objective.
 
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