Rifle Scopes what power for proper ranging?

[JacobWilliams]

I am looking to get a nightforce 5.5x22x56 with the npr-1 reticle when I get my new rifle and was wondering if anybody new what magnification it had to be set on to range properly? If nobady knows what is the formula to figure it out, I thought on here somewhere but cannot find the post since my browser will not let me use the search function.

thanks, raiderone

 

[pinzmann]

Re: what power for proper ranging?

The Nightforce range at 22x

 

[Turk]

Re: what power for proper ranging?

You can range anywhere as long as you do the math! Hopefully Lindy will see this post and "school" us!

 

[JacobWilliams]

Re: what power for proper ranging?

I know how to do the math, i was just wanting to know what magnification the scope had to be on so the range would be correct. I have read that if the scope is not at proper magnification then your math will be wrong and your shot will not be accurate.

 

[steelcomp]

Re: what power for proper ranging?

You won't know for sure untill you test it. I've never owned a NF, so I don't know...they might be dead on, but I know some scopes aren't as advertised. If you need dead nuts accuracy, probably best to verify.

 

[CSTactical]

Re: what power for proper ranging?

You can use the NF at 22x or 11x. At 22x the NPR1 will equal 1moa down per line and 2moa across. The MLR at 22x is broken down into half MILs. At 11x every thing doubles 1moa becomes 2moa and for the half MIL they will become 1mil.

Hope this helps.

Mason @ CST

 

[bohem]

Re: what power for proper ranging?

You can range at any power is true. The scope is setup to range at max power per the instructions they give you.

If you range at 5x instead of 22x you need to do the following.

Get the MOA or MIL reading as you normally would, and calculate the range exactly how you normally would.

Now that you have a number, let's say it comes out to 425 yards

You take the range and multiply by 22/5.

This is your max power divided by the power you ranged at. That means that the true range is (22/5)*425 = 4.4*425 = 1870 yards

Let's look at it from the "how'd you do that?"

The reticle on a second focal plane scope never changes size. Therefore, the dots change true spacing as the magnification changes.

If you have an object that's 1 MOA across at 1000y it's real life size is about 10.5"

If you look at it on 22x, the object looks to be 1 MOA, but if you look at it on 5x, it appears to only be about 0.227 MOA

You're working from a pure ratio of the magnification now. Calibrated power ( generally Max power) is always the numerator, in this case, 22 power.

The power you're ranging at is always the denominator, this case it's 5x.

Just as a sanity check, verify that if you take the calibrated power (22) and divided it by max power (22) you get 1

22/22 = 1, therefore if you range at max power you have no further changes to make.

Does that make sense or did I just stir the mud puddle?

 

[BOLTRIPPER]

Re: what power for proper ranging?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: raiderone</div><div class="ubbcode-body">I am looking to get a nightforce 5.5x22x56 when I get my new rifle and was wondering if anybody new what magnification it had to be set on to range properly? If nobady knows what is the formula to figure it out, I thought on here somewhere but cannot find the post since my browser will not let me use the search function.

thanks, raiderone</div></div>




....22x

 

[JacobWilliams]

Re: what power for proper ranging?

I had to read it a couple time so the puddle would settle but yeah that makes since after i did some more math on paper. thanks bohem thats exactly what i was looking for, thanks to everyone else that replied.

 

[bohem]

Re: what power for proper ranging?

Glad I could help.