What ballistic program to use with MOA base?

[Conaso]

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.

Where is that written?

 

[RegionRat]

True or not, with some rigs that is a difficult place to measure, other times it is easier. Either way, a millimeter or so error is one thing, but being off half an inch is another. YMMV

 

[SSL]

Sounds like I am glad I never got Strelok. Lol

Excellent program. Wouldn't want to be without it. Only requires proper input to work brilliantly. Just like any calculating program or app...garbage in, garbage out.

 

[Rob01]

Excellent program. Wouldn't want to be without it. Only requires proper input to work brilliantly. Just like any calculating program or app...garbage in, garbage out.

Yup but if you had to measure from the objective to work and won’t work from the windage knob then not sure what would be the issue. Used the windage on every program I have ever used without issue for many years.

 

[SSL]

Yup but if you had to measure from the objective to work and won’t work from the windage knob then not sure what would be the issue. Used the windage on every program I have ever used without issue for many years.

Won't work from the windage knob? Not sure what you mean by that. The measurements are only to enter the actual center of the scope distance to the center of the bore so the correct height of the scope can be entered into the app information. Doesn't matter how you measure it as long as it's accurate...just like every other ballistic app worth using. Measuring from the center of the objective might well be better for a 25 MOA rail simply because of the angle introduced by the rail. Standard mounting (parallel to the barrel) wouldn't be as difficult and could reasonably be determined from any center point of the scope body.

 

[RegionRat]

OP's issue is probably something much larger than taking sight line above bore value from a different spot on the scope, he probably needs to blow it out and put everything in carefully while double checking each step.

Another approach is to parallel with another solver and see if it gives a different answer. Even the free internet ones are known to be very good, they are just harder to true than something like AB or Strelok.

 

[Rob01]

Won't work from the windage knob? Not sure what you mean by that. The measurements are only to enter the actual center of the scope distance to the center of the bore so the correct height of the scope can be entered into the app information. Doesn't matter how you measure it as long as it's accurate...just like every other ballistic app worth using. Measuring from the center of the objective might well be better for a 25 MOA rail simply because of the angle introduced by the rail. Standard mounting (parallel to the barrel) wouldn't be as difficult and could reasonably be determined from any center point of the scope body.

Look at the comment above saying with Strelok you had to measure at the objective. That was what I was commenting on. I never measured there on any other app was my point. I know how to work apps and get good data.

 

[Conaso]

I emailed Igor, and as always, he promptly replied...

"Yes. Measure at scope turrets

Igor Borisov

Greetings Igor,

Someone wrote this... "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."

What would you recommend as the measuring point for those using a canted scope base, e.g., 20.6MOA/6MIL?

I have used the midpoint between the rings, typically the elevation/windage adjustment housing.

 

[Rob01]

Yup either a ruler or caliper can get a good measurement from center of bolt/bore to center of windage knob. These pics are just got reference and not to compare each other.

 

[RangeMe]

I’m following everyone’s input here and if you have success with your formula in addition to StrelokPro then it’s hard to argue with it.

So if I have a CZ 457 trainer precision with a 25MO a base and an Athlon 30 mm 50 mm objective then that seems like a combination that a lot of people have? Any one do the math with this rig and have any thing to offer here?

Thanks everyone for their input and very educational. I’ve been using Strelok for it seems like 10 years and haven’t had a problem until recently with putting in an MOA version of an actual Mill scope as a app option.
Always learning!!!

 

[RangeMe]

I’m following everyone’s input here and if you have success with your formula in addition to StrelokPro then it’s hard to argue with it.

So if I have a CZ 457 trainer precision with a 25MO a base and an Athlon 30 mm 50 mm objective then that seems like a combination that a lot of people have? Any one do the math with this rig and have any thing to offer here?

Thanks everyone for their input and very educational. I’ve been using Strelok for it seems like 10 years and haven’t had a problem until recently with putting in an MOA version of an actual Mill scope as a app option.
Always learning!!!

I forgot to mention that the CZ or 57 Asline combination with 25 MLA scope uses low or. 94 tax pro rings.

OK … anyone have a good optic-bore number on this rig?

 

[Rob01]

Do you have a ruler? Measure it. Pics above. It’s easy.

And what math are you talking about? You put numbers in and get an answer. No math. Not sure why you are having a problem getting data in mils. Strelok has mils right?

 

[Conaso]

I’m following everyone’s input here and if you have success with your formula in addition to StrelokPro then it’s hard to argue with it.

So if I have a CZ 457 trainer precision with a 25MO a base and an Athlon 30 mm 50 mm objective then that seems like a combination that a lot of people have? Any one do the math with this rig and have any thing to offer here?

Thanks everyone for their input and very educational. I’ve been using Strelok for it seems like 10 years and haven’t had a problem until recently with putting in an MOA version of an actual Mill scope as a app option.
Always learning!!!

Write to Igor, click the "About" button to trigger your email app and ask him for the mil version to be added. It might be an oversight.

 

[RangeMe]

Do you have a ruler? Measure it. Pics above. It’s easy.

And what math are you talking about? You put numbers in and get an answer. No math. Not sure why you are having a problem getting data in mils. Strelok has mils right?

Strelok only has the Athlon Helos I have in MOA, not mills. I didn’t think at the time to just use one of there 30 mill tubes with the same objective because I’ve never had a problem with not having the scope I have as an option. Mostly Leupold.

The math I’m referring to is splitting the difference between the objective and bore and the ocular side and bore. I was just simply inquiring if someone has the same set up that I have and has measured it? Not to be lazy but to be accurate and simply get the answer from somebody who has already input the numbers with success.

Thanks for your input.

 

[Rob01]

Strelok only has the Athlon Helos I have in MOA, not mills. I didn’t think at the time to just use one of there 30 mill tubes with the same objective because I’ve never had a problem with not having the scope I have as an option. Mostly Leupold.

The math I’m referring to is splitting the difference between the objective and bore and the ocular side and bore. I was just simply inquiring if someone has the same set up that I have and has measured it? Not to be lazy but to be accurate and simply get the answer from somebody who has already input the numbers with success.

Thanks for your input.

So are you wanting the reticle subtensions when you say that specific scope in mils?

It takes all of 15 seconds to measure. Forget that math BS and also measure at the windage knob. You do not have to do it at the objective.

 

[Ned Ludd]

So are you wanting the reticle subtensions when you say that specific scope in mils?

It takes all of 15 seconds to measure. Forget that math BS and also measure at the windage knob. You do not have to do it at the objective.

How you measure the distance between the center axis of the scope and the bore axis shouldn't matter. As Rob noted, the simplest way is measuring at the turrets. However, if you really want to use the objective lens method, you should still end up with exactly the same value. The difference in the height over bore measurement due to scope rail cant over the length of the scope from turrets to objective should be negligible (i.e. a 20 MOA rail is worth 1/3 of one degree angle, over a distance of about 6-8", or less than 0.1" difference between the two methods).

It sounds to me like there are other issues at work here. There often are when the [predicted] external ballistics don't match the actual drops. Being sure of the correct BC value is a common issue (i.e. correct value, G1 vs G7, etc.). Having an accurate muzzle velocity can also be an issue. It needs to be a measured muzzle velocity made with a decent chronograph, not a commercial ammunition "box" velocity value, which may or may not be correct. Finally, the atmospheric inputs need to be right, and boxes checked if they are "station-corrected" values. Even when everything is right, I seen plenty of times where the predicted drops from 100 to about 400 yd were spot on, as well as the predicted drops from about 800-1000 yd. However, the predicted drops from around 500-600 needed to be corrected, sometimes by a substantial amount. Sometimes the best you can do it get it reasonably close as well as you can across the entire expected range, knowing it may need to be tweaked a bit somewhere within that window.

 

[RangeMe]

Makes total sense. Pretty simple when ones mind gets on board.
thank-you

 

[RangeMe]

Write to Igor, click the "About" button to trigger your email app and ask him for the mil version to be added. It might be an oversight.

Thank you.

 

[RangeMe]

Thank you.

Thank you.

Could you help me a bit more with where rhe about button is on how to get ahold of Igor? The StrelokPro app is a bit confusing to me on how do anything but put in data.
thanks in advance.

 

[Rob01]

So is the whole moa and mil thing only reticle related? If you can run your data in mils it doesn’t matter about the reticle as the reticle is in mils so if you had to dial 2.4 mils to hit at 400 yards then that would be the same you would hold in the reticle.