Reticle math and stuff..

[AndyRealtree]

Ok, so I'm new to the "long range" world. I've got a .308 AR10 that I'm in the process of building a recipe for. I've been doing some research on how to use a reticle for different distances and such. I've got a Leupold vx3i 4.5-14x40 with the windplex reticle. So, I've got MOA holdover marks for wind, but nothing for elevation. I've been reading some ways to make it a little more versatile as far as zeroing at the top duplex so I have at least 3 references w/o adjustment. (Top duplex, crosshairs, and bottom duplex) Can someone help me figure out how all that works, as far as the math behind it and such?

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[Soclose]

New to LR as well. Subscribed

[AndyRealtree]

New to LR as well. Subscribed

We'll learn together. Lol

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[stxhunter]

I switched to mil/mil FFP scopes and it makes life so much easier.

That's a good scope, but considering it's second focal plane you're measurements will be different at different magnifications.

I can't help you with that specific reticle, but there may be an app like Nikon Spot On but for the leupold.

Your best bet would be to hit the range and try the top zero at different magnifications and make a dope card.

Not sure how much elevation that scope has, would it be possible to zero on the top post? Most that I've seen use this method zero on the cross hair and use the top or bottom post as hold overs.


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[JakeGraves]

That scope is made for dialing the elevation. Use the turrets.
It helps to thing in terms of moa (or mils if scope is in miliradians) and dial turret to whatever your distance calls for.

[AndyRealtree]

That scope is made for dialing the elevation. Use the turrets.
It helps to thing in terms of moa (or mils if scope is in miliradians) and dial turret to whatever your distance calls for.

I'm used to moa. Have been thinking of getting a mil to add to the collection a d learn as well. Because I don't have holdover marks for elevation, I was planning on dialing it as that's how it's supposed to work. It was more of for little golden nuggets of info for myself/dope and stuff like that. In a perfect world I'll dial elevation, but I'm curious for other methods too. Like I said, I'm new to this world a d I just want to sponge as much as I can.. Lol

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[Scoobyh]

I'm used to moa. Have been thinking of getting a mil to add to the collection a d learn as well. Because I don't have holdover marks for elevation, I was planning on dialing it as that's how it's supposed to work. It was more of for little golden nuggets of info for myself/dope and stuff like that. In a perfect world I'll dial elevation, but I'm curious for other methods too. Like I said, I'm new to this world a d I just want to sponge as much as I can.. Lol

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I would stick with MOA or Mils, it's to easy to get confused going back and forth I think. If it tracks true, I would just dial it or get a scope with drop hashes.

[dphillips62]

The easiest way is to get an app. such as Ballistic AE, or Strelok for your phone or tablet. Some scope companies also have programs that will allow you to make a range card also. You will still need to correct either the app or computer program with actual hits.

[splitbeam145]

Ok, so I'm new to the "long range" world. I've got a .308 AR10 that I'm in the process of building a recipe for. I've been doing some research on how to use a reticle for different distances and such. I've got a Leupold vx3i 4.5-14x40 with the windplex reticle. So, I've got MOA holdover marks for wind, but nothing for elevation. I've been reading some ways to make it a little more versatile as far as zeroing at the top duplex so I have at least 3 references w/o adjustment. (Top duplex, crosshairs, and bottom duplex) Can someone help me figure out how all that works, as far as the math behind it and such?

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Does this have the CDS turret system. If so you'll dial turret to needed setting and hold dead on regardless of distance. Basically you'd need to spend alittle time at range and build up a dope sheet. In reality, you'd have to range distance either way. By the time you figured holdover, you could just as quickly dial turret to correct yardage and hold dead on. It doesn't take any longer to dial turret.

[AndyRealtree]

The easiest way is to get an app. such as Ballistic AE, or Strelok for your phone or tablet. Some scope companies also have programs that will allow you to make a range card also. You will still need to correct either the app or computer program with actual hits.

I have strelok and about 5 others.. Lol. Strelok is the best one I've found so far in the free category. Not opposed to buying one, just want to get a basic understanding before I drop the coin. I don't have a chrono, so I'm really just using it for familiarization right now. I wish Leupold had an app, but I can't find one if they do. I understand holdover and how to use it, just curious on how to use the basic elevation duplex w/o dialing. Like I said, mainly just for a dope. I really want to find a formula on how to calculate those distances. I know I need muzzle velocity, but until I can chrono and get my recipe right I thought it'd be good to practice the math. Like, if I zero my top duplex at 100 yards how do I figure out what the crosshairs are at and the bottom duplex?

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[AndyRealtree]

Does this have the CDS turret system. If so you'll dial turret to needed setting and hold dead on regardless of distance. Basically you'd need to spend alittle time at range and build up a dope sheet. In reality, you'd have to range distance either way. By the time you figured holdover, you could just as quickly dial turret to correct yardage and hold dead on. It doesn't take any longer to dial turret.

Yessir, has the cds turrets. I'll be building a dope card soon, just need to get my load recipe built 1st as well as get a few other boxes of factory ammo to throw in the mix

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[dphillips62]

the best way is to make your own range card from actual shooting at distance. zero in at 100 yds then shoot at 50 yrd. increments as far as you wish to shoot

[BULL21]

Get an app such as bullet flight. Program your load data and it will give a ballistics start. Find a place to practice distance. If the scope will accommodate turrets order a set when you get dialed in. Not very familiar with Leuopolds, but having zero stop is a plus when moving the scope frequently

[trophy8]

Wasting your time trying to hold elevation in that reticle. If you want something different just have it changed to a TMOA. But don't confuse yourself. I know you're wanting to learn but in my opinion you're chasing your tail on something that's not even reasonable when you could be focusing on something more important and learning that. I have that same reticle in a vx6....just dial elevation. Much easier. Even in my mk6 or other optics that have elevation hold overs, I still dial. I always hold wind as it's variable.

[AndyRealtree]

the best way is to make your own range card from actual shooting at distance. zero in at 100 yds then shoot at 50 yrd. increments as far as you wish to shoot

That's what I plan on doing. The max distance range I have is 200 yards, so I'm really just trying to figure out how to calculate. Like, if I'm "X" inches high at whatever distance, how do I figure out where the POI would actually be

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