distance adjustment for scope

[Cobrafreak]

I just got at a gun show an EAGLE-YDRS40 2.5-10x40RL1 VARIABLE POWER SCOPE that has an open turrant adjustment for distance. The knob is numbered 1-2-3-4-5 which is respectively in yards. If you move the knob from 1 to a higher number it lowers the crosshair which makes you elevate the barrel to put you on target at said distance. It's a good idea, and I know it is calibrated to one particular caliber and weight of bullet, but I don't know what that is. As the numbers increase, the distance between the click stops increase as well, which tells me it is calibrated to something. The directions don't tell me anything. I'm hoping I can use it with my 5.56 AR. If it just gets me in the neighborhood I will be happy. It has mil spec dots on the crosshair and I can write down range data. Is this a unique feature for a scope or is it common? I've never seen it before.

[CSTactical]

From what I can see, it doesn't specify on their website:

http://www.ijksales.com/eagle_eye_scopes.htm

Have you tried calling them?

Thanks,

Mason @ CST

[ubet]

I just got at a gun show an EAGLE-YDRS40 2.5-10x40RL1 VARIABLE POWER SCOPE that has an open turrant adjustment for distance. The knob is numbered 1-2-3-4-5 which is respectively in yards. If you move the knob from 1 to a higher number it lowers the crosshair which makes you elevate the barrel to put you on target at said distance. It's a good idea, and I know it is calibrated to one particular caliber and weight of bullet, but I don't know what that is. As the numbers increase, the distance between the click stops increase as well, which tells me it is calibrated to something. The directions don't tell me anything. I'm hoping I can use it with my 5.56 AR. If it just gets me in the neighborhood I will be happy. It has mil spec dots on the crosshair and I can write down range data. Is this a unique feature for a scope or is it common? I've never seen it before.

Hmm, why did you get a scope, designed for a bullet of which you dont know or probably use, or even maybe in the same caliber you own?

[ubet]

is this the scope?

[Droppin Deuces]

BDC scopes are getting more and more common, it seems. But just because it has yardage markings on the turret doesn't mean you have to use it as such. Isn't there a separate set of numbers on the turret to use for fine tuning?

[NapaCountyShooter]

Just take it to the range and get some real data. The company can set the Bullet Drop marks for whatever they want, but in the end, it's what your specific rifle does that really matters. If it is the scope pictured above, I'd guess randomly that it's set for 55 gr. .223 as it seems to be an acog style optic.