Rifle Scopes @what mag does a SFP Mil/MOA scope become MOA/MOA?

[libertyman777]

I've noticed in the past that some manufacturers have advertised that at one magnification the reticle is MIL and at another magnification it is MOA in a second focal plane scope.

I understand that this is relative to the magnification of the target changing with respect to the reticle and that the magnification should be decreased until each "mil" subtends 4 MOA instead of 3.438 MOA. Is there a formula for this that can be applied to a scope or do you just have to mark off 4 MOA and change the magnification until it brackets the line?

Thanks,

Paul

 

[buffybuster]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

If the SFP Mil reticle Mils accurately at 12X, then it will be a 2moa reticle at ~20.6X (double check at the range). That works well if you have half mil marks, as they will become 1moa marks.

If mil at 14X, then moa at ~24X

 

[libertyman777]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

Okay but I'm not sure about the math. I've been thinking about it. I need to go to inches instead of MOA. So 1 mil = 3.6 inches at 100 yards. 3.6" divided by 4" is 0.9. So if I multiply the magnification that the scope mils at, say 10x by the factor 0.9, then each mil should equal 4" at 9x. Or it should equal 2" at 18x. Given that this should be double checked at the range, the math should be:

(3.6/2)*mil magnification = magnification reticle will equal 2" per mil.

So 14x mil reticle would equal 2" per mil at magnification 25.2x and this would need to be confirmed at the range.

Is this correct?

 

[buffybuster]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

You asked about converting from Mil to MOA. Why are you injecting "Inches" (unnecessarily) to the conversation and conversion?

1 mil = ~3.438MOA

3.438moa/2moa=1.719 magnification factor

14X (magnification at which reticle ranges in Mils) x 1.719 = 24.066X (for reticle to range in 2MOA)

Never trust the magnification ring, double check the setting at the range. No inches anywhere in the calculation; angular units to angular units. FOR SFP RETICLES ONLY

 

[42769vette]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

to much math.

this is why i like shooting a mil/mil or moa/moa scope. i cant stand mil/moa or moa/mil

 

[libertyman777]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: buffybuster</div><div class="ubbcode-body">You asked about converting from Mil to MOA. Why are you injecting "Inches" (unnecessarily) to the conversation and conversion?

1 mil = ~3.438MOA

3.438moa/2moa=1.719 magnification factor

14X (magnification at which reticle ranges in Mils) x 1.719 = 24.066X (for reticle to range in 2MOA)

Never trust the magnification ring, double check the setting at the range. No inches anywhere in the calculation; angular units to angular units. FOR SFP RETICLES ONLY </div></div>

Well, because I looked at my turret and it says "One click = 1/4" 100 yards." I guess it could be MOA though. The scope in question is a Bushnell 6500 4.5-30x50 Mildot. The Bushnell website is giving conflicting information in both MOA and IPHY. So it doesn't look like I can trust the turret labeling either.

But converting a reticle, magnification wise, to match a turret that is divided into inches is valid if that is indeed the case. Otherwise I would then have a MOA reticle and an Inch based turret. Close but no cigar.

So I guess I need to determine if my turret adjustment is either Inches or MOA, then adjust the magnification accordingly.

Thanks for your help.

Paul

 

[libertyman777]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 42769vette</div><div class="ubbcode-body">to much math.

this is why i like shooting a mil/mil or moa/moa scope. i cant stand mil/moa or moa/mil </div></div>

Just one time math. One man's problem is another man's versatility.

Paul

 

[buffybuster]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

I know some users like IPHY adjustments and reticles, but to me it is neither fish nor fowl. Mil or MOA are both valid angular measurement systems. Why create another IPHY system that really isn't based on anything other than the "inch" which is meaningless in angular measurement.

 

[gebhardt02]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

Libertyman777,

I mark my power adjustment rings on two NF NXS 3.5-15X50 scopes as well as Leupold 6.5-20X50. I just marked a white paper with lines at exactly 4.188" (4 MOA)and hung that up at 50 yards. So you get a solid rest and decrease magnification until your normal 2 mil line lines up with the marks on the paper and then mark your magnification ring appropriately. For the NXS the power is around 11X.

So a couple questions I can see people asking now is why at 50 yards? So I can see the lines better and keep them fairly thin. This is also why instead of the lines extending to the 1 mil hash mark they will extend to the 2 mil mark.

I've verified that the power ring is accurately set so the reticle is now MOA spacing (half mil marks are every 2 MOA now) by shooting out to 500 yds which is the furthest I've been able to shoot recently. So what do I get from this other than decreased magnification? Well, since I'm not independently wealthy and my optics are still old school mil reticle and MOA knobs I now have a system to match my reticle to my turrets as long as I'm OK with a reticle that marks off every 2 MOA. And I can talk the same language as a mil shooter if I have to.

It isn't a perfect system but it works alright so far. I might be able to give more info after the hide cup this year.

Geb

 

[libertyman777]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: buffybuster</div><div class="ubbcode-body">I know some users like IPHY adjustments and reticles, but to me it is neither fish nor fowl. Mil or MOA are both valid angular measurement systems. Why create another IPHY system that really isn't based on anything other than the "inch" which is meaningless in angular measurement. </div></div>

Can't argue with the logic. But if I've got inch turrets, then that's what I have to work with.

 

[libertyman777]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gebhardt02</div><div class="ubbcode-body">Libertyman777,

I mark my power adjustment rings on two NF NXS 3.5-15X50 scopes as well as Leupold 6.5-20X50. I just marked a white paper with lines at exactly 4.188" (4 MOA)and hung that up at 50 yards. So you get a solid rest and decrease magnification until your normal 2 mil line lines up with the marks on the paper and then mark your magnification ring appropriately. For the NXS the power is around 11X.

So a couple questions I can see people asking now is why at 50 yards? So I can see the lines better and keep them fairly thin. This is also why instead of the lines extending to the 1 mil hash mark they will extend to the 2 mil mark.

I've verified that the power ring is accurately set so the reticle is now MOA spacing (half mil marks are every 2 MOA now) by shooting out to 500 yds which is the furthest I've been able to shoot recently. So what do I get from this other than decreased magnification? Well, since I'm not independently wealthy and my optics are still old school mil reticle and MOA knobs I now have a system to match my reticle to my turrets as long as I'm OK with a reticle that marks off every 2 MOA. And I can talk the same language as a mil shooter if I have to.

It isn't a perfect system but it works alright so far. I might be able to give more info after the hide cup this year.

Geb </div></div>

No, not perfect but I'm in the same boat right now. And with so many scopes out there with variable power, SFP reticles and mismatched turrets, it's a good solution. So depending on whether my turrets are MOA or IPHY my 2 MOA would be 17.2x or 2" would be 18x. It's cool that it can be made to work out.

 

[Ragnarok]

Re: @what mag does a SFP Mil/MOA scope become MOA/MOA?

My ior 12-52x56 has 0.5 mrad at 14.4x and 1moa at 26x and 0,5moa at 52x, all these settings are marked in red at the magnification adjustment ring, it also has a clear click when you reach 14,4 - 26 - 52 on the power settings