MRAD scope elevation change

[Ty31384]

All - For the first time, I decided to blow a good amount of money on a scope. I got a first focal plane Vortex Razor scope with an MRAD reticle.

I understand the basic and functional math behind the MRAD. The scope is sighted in on my rifle at 200 yards. At that distance in MRAD, 1/10 change in elevation would be roughly equivalent to .72”, and 10/10 changes is 72”.

Where my question is - and I can’t find this anywhere - if I know I have a 200 yard zero and want to take a 400 yard shot, do I make 20 clicks (meaning each click is 1/10) or do I have to adjust for the difference that 1/10 at 400 is now worth 1.44”? I am so confused by this and can’t figure it out. Any help is appreciated.

 

[Vaultboy404]

Just aim a tad bit higher than you normally would

 

[cmshoot]

Each “click“ is .1mil per 100yds.

.1mil = .36MOA, so your mil adjustment translated into MOA is each “click” is .36MOA per 100yds.

1MOA = 1.047” per 100yds. For practical purposes, we round the 1.047” down to an even 1”, which is commonly referred to as “shooter’s MOA”.

So, .1mil is equal to .36” per 100yds, but you need to start thinking in mils if you’re going the MRAD route, and not in inches and/or MOA.

 

[cmshoot]

Your question as to how much to adjust from one yard line to the another cannot be answered without a lot more information from you. At the least, I would need to know what caliber and load you’re shooting (ex. 6.5 Creedmoor with Hornady 147grn Match ammo), and an exact muzzle velocity would help even more.

 

[Ty31384]

Your question as to how much to adjust from one yard line to the another cannot be answered without a lot more information from you. At the least, I would need to know what caliber and load you’re shooting (ex. 6.5 Creedmoor with Hornady 147grn Match ammo), and an exact muzzle velocity would help even more.

Ok - That makes sense. I shoot a 7mag. I’ve only hunted in Georgia, and my gun loves the Federal Power Shok 150-grain. My three shot group after it was sighted in was under a dime at 200 yards. The gun is an old Remington 700 (early 80s model) with a 26” barrel.

 

[Ty31384]

Ok - That makes sense. I shoot a 7mag. I’ve only hunted in Georgia, and my gun loves the Federal Power Shok 150-grain. My three shot group after it was sighted in was under a dime at 200 yards. The gun is an old Remington 700 (early 80s model) with a 26” barrel.

Crud - Muzzle velo on federal’s site says 3110 fps.

 

[cmshoot]

With a 200yd zero, your drop to adjust for 400yds should be about 1.3mils.

Depending on a lot of different variables, your drop from 200 to 400yds should be about 18”.

18” converted to MRAD is 1.25mils, rounded up to 1.3.

 

[cmshoot]

Conversion formulae:

MOA’s to mils: MOA x .296 = mils

Mils to MOA: mils/.296 = MOA

MPH to FPS = MPH x 1.4667 = FPS

Inches to mils: inches/(Range in yds/100)/3.6 = mils

Inches to MOA: inches/(Range in yds/100) = MOA

MOA to inches: MOA x (Range in yds/100) = inches

Mils to inches: mils x (Range in yds/100) x 3.6 = inches

 

[Ty31384]

Ahhh - I think I get it.

If it drops 40” at 500 yards, then it’s
40 / (3.6*5) = 2.2222, or 2.2 mils?

If the scope has .1 mil adjustments, and the turret was at zero (and assuming higher number is increased elevation), then I’d turn it to 22 times to 2.2?

 

[cmshoot]

Yessir