Using zoom to convert an SFP mil-reticle to MOA

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Cbf123

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I haven't seen anything posted about this technique, but it should be possible to take a variable-zoom second-focal-plane scope with a mil-based reticle and MOA turrets and use the zoom to essentially cause the reticle to read in MOA.

I've got a second-focal-plane 4-16x scope with a reticle that has mil-dots at 10x, but it's got MOA-based turrets. By my calculations, if I change the zoom to 10/1.164 = 8.6X then the mil-dots will actually represent 4 MOA. Similarly, if I change the zoom to 10/0.872 = 11.46X, then the mil-dots will represent 3 MOA. If you've got the zoom range, at 17.2X the mil-dot spacing would represent 2 MOA.

I'm told that some mil-dot scopes have a marking on the zoom ring for one of the above zoom levels. This would make sense, but it seems to be pretty rare and isn't generally mentioned online.

Is this a well-known technique and I'm just not looking in the right places?
 
Not to sound glib, but I think the solution is to buy a scope that has the same measurements, be it mil-r or MOA, on both turrets and reticle.
 
Exlibris said:
Not to sound glib, but I think the solution is to buy a scope that has the same measurements, be it mil-r or MOA, on both turrets and reticle.
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That'd be ideal...but you try and find one that's priced within reason, has side-adjust parallax adjustment down to 10 yards, and is rated for a spring-powered air rifle.
 
I don't know how many people do it, but I've been preaching it for awhile. The math is simple enough, but in the end it is better to just check the setting against a target grid. Mark the dial if you have to.
 
Dogleg said:
I don't know how many people do it, but I've been preaching it for awhile. The math is simple enough, but in the end it is better to just check the setting against a target grid. Mark the dial if you have to.
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Agree with the above. If want to give this a try set up a grid target and test out your reticle at your calculated magnifications and mark the scope once you have it down.
 
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