MOA

jmason · #1 04-07-2008, 09:19 AM

This question I'm sure has been covered to death but I'm having trouble finding the answer I need by seaching. I have mounted a scope on a 300 rum and have about 25 moa left of "up" dail. The scope does dail in moa.I used a web calculator and some non specific info pasted below. could I conclude by the chart that I have enough Vertical dail to reach beyond 800yds? If not I'm alittel confused by the chart info. By looking at inches I'd think I'll only reach 450yds. I know that 1 inch and 1 moa are slightly different. Do I need to multiply moa by yards? for example 4.1 Moa x 4 @ 400yds= 16.4 Moa

Am I on the right track?

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Sierra, .308 dia. 240 gr. HPBT Match 
 
MV: 3000 ft/s CH: 10 ft 
 
WS: 10 mph TS: 10 mph 
 
T: 59 °F PC: 29.92 in Hg H: 0% A: 1000 ft 
 
SH: 1.5 in SO: 0 in ZH: 0 in LOS: 0° 
 
Range Drop Wind Lead
(yds) (in) (moa) (in) (moa) (in) (moa) 
100 1.4 1.3 0.4 0.4 18.0 17.2 
200 -0.0 -0.0 1.6 0.8 36.8 17.6 
300 -6.0 -1.9 3.8 1.2 56.5 18.0 
350 -10.8 -3.0 5.2 1.4 66.7 18.2 
400 -17.0 -4.1 6.8 1.6 77.1 18.4 
450 -24.6 -5.2 8.7 1.9 87.8 18.6 
500 -33.6 -6.4 10.9 2.1 98.8 18.9 
525 -38.7 -7.0 12.1 2.2 104.4 19.0 
550 -44.2 -7.7 13.4 2.3 110.0 19.1 
575 -50.1 -8.3 14.7 2.4 115.7 19.2 
600 -56.4 -9.0 16.1 2.6 121.5 19.3 
625 -63.1 -9.6 17.5 2.7 127.4 19.5 
650 -70.3 -10.3 19.1 2.8 133.3 19.6 
675 -77.9 -11.0 20.7 2.9 139.3 19.7 
700 -85.9 -11.7 22.4 3.1 145.4 19.8 
725 -94.5 -12.4 24.2 3.2 151.6 20.0 
750 -103.5 -13.2 26.0 3.3 157.9 20.1 
775 -113.0 -13.9 28.0 3.4 164.2 20.2 
800 -123.0 -14.7 30.0 3.6 170.6 20.4 
 

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Willys46 · #2 04-07-2008, 10:53 AM

IF your comfrotable with 1 inch = 1moa then do this:

123 inches divided by 8. Drop the zeros because 8 MOA at 800 yards.
15.375 MOA (this is different then your drop table above due to the 1.047)

The caculator that you have listed has true MOA drops listed. the third column.

if it is 750 yards divide by 7.5 to get moa.

I round to the nearest .25moa due to .25moa clicks on the scope.

jmason · #3 04-07-2008, 11:14 AM

So this means that with the 25 MOA up dial up I have left I'm good out to 800yards?

Buffalobob · #4 04-07-2008, 11:43 AM

YES!!!

jmason · #5 04-07-2008, 12:37 PM

Thank you both very much. I'm a little dense sometimes!

Buffalobob · #6 04-07-2008, 12:52 PM

It is not being dense on your part. You asked a question and sometimes we get so involved in answering that we forget what the question was.

WildcatB · #7 04-07-2008, 02:35 PM

Your columns aren't lined up on my screen but it looks like you need 14.7 moa at 800. You said you have 25 moa so you have plenty.

The 1 inch ~ = 1 moa is at 100 yards. At 800 yards 1 moa is 1.047 x 8 or 8.736 inches.

As you go farther out, the arc length increases. Think of a shape like a pizza slice. The farther you go out from the tip, the larger the crust edge will be - WITH THE SAME ANGLE.

It's proportional. So one click covers 1/4 moa at 100, and 1/2 moa at 200, and 1 moa at 400, ....

Since your list says 14.7 moa at 800. you need to come up 14.7 moa. Since you have 4 clicks per moa, you'll need 14.7 x 4 = 58.8 clicks up. Round it to 60 clicks. If you have 25 moa you'll have 25 x 4 = 100 clicks clicks to go up.

At 450 yards, you need to come up 24.6 inches or 5.2 moa, which is 5.2 x 4 = 20.8 clicks (30 rounded).

If you had to come 24.6 inches at 100 yards, that would be your limit. At 450 yards you can cover it easy.

At 800 yards 25 moa is 8.736 x 25 = 218.4 inches. That's the max drop you could dial in on your scope

I could draw a diagram... I will hold on...

also, most ballistic's programs give you an option list the correction in clicks so you don't have to do any math besides counting.

Hope this helps...