Home Forums Hunting & Shooting Hunting Optics Can I get some help with this please??

This may seem elementary, but……. I’m elementary! 🤣🤣

I have a Vortex Viper HST 6-24x50 scope. It’s 2nd focal plane. When the scope is dialed to 18x power, the subtensions (hashes) are at true MOA value.

How do I determine what my yardages are when I’m dialed all the way in at 24x power? I want to have a chart printed out for my gun so that I can have it handy for “on the fly” yardages when dialed all the way in.

Thanks in advance!

I know I'm not much help by this statement but your manual on your reticle should explain this. If you do not have that get on the vortex website and you should be able to download it.. sorry I'm no more help than that oh you might want to get your calculator out too..

The reticle doesn’t say anything other that the scope is at accurate at 18x.

Ok, so you have the MOA reticle which has hash marks at every 2moa at 18x. So as you increase the power to 24x, since its a 2nd focal plane scope, the reticle stays the same size as the image increases in size.. Therefore your hash marks will be equal to 1.5 moa. From there, you just need to decide how you want your drop table - what MOA for every X yds -or- yardage for each hash mark.

So to make sure I’m understanding you, instead of my subtensions being a true 2 MOA at 18x power, I’m at 1.5 MOA at 24x power?

First one down is 1.5 MOA, then 3 MOA, 4.5 MOA, 6 MOA, etc….

Am I following you correctly?

Deleted… note to self, never do math again while “sleep deprived”…

I think you're erroneously second guessing yourself.

Good old trial and error?

For every hash mark, take the subtension value in MOA at 18x, and multiply it by 18 and divide by 24. That will give the subtension in MOA at 24x.

Seems like a Rube Goldberg exercise when there's so many good FFP reticles these days. Why try to keep a bunch of different sets of subtensions straight?

If you insist on keeping SFP and using different subtensions, just put it on the X for which you'd like to know the measurements, measure through it on a target, shoot and then measure where the bullets are landing.

Multiply x 0.75 or x 3/4, it’s simpler because the numbers are smaller. 😊

Strelock Pro will spit it right out for you.

Yup… deleted the nonsense I had posted

THIS^^^^^^^

Dang, beat me to it! That’s what I was gonna say😛



Okay, that’s a lie; ain’t gotta clue. Math makes me sad.

Yup

Just shoot the thing on 18x. No one needs more power than that with an SFP scope. It’s just shrinking your fov to the point of doing more harm than good.

I'm not sure if the OP is a shooter.

That's what I was thinking.