Adjustment question


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blackops
November 15, 2009, 01:12 AM
If you have a 1/2 moa clicks, your target is 500yds, and your bullet drops 38 inches, how many clicks do you adjust your dial up?

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WNTFW
November 15, 2009, 01:30 AM
Using 1" per 100yd as 1 MOA
15.2 clicks so you need 15 or 16 1/2 MOA clicks to correct 38 inches @500

15 clicks = 37.5" (7.5 MOA x 5)
16 clicks = 40" (8 MOA x 5)

The other thing is MOA is really 1.047
So 38 is 14.517 1/2 MOA clicks. Using true MOA or 7.25 MOA

You made need to determine if the scope is true 1/2 MOA or 1/2" per 100yds. Scopes can also be a little off of either

Just make sure 38" is the right number to correct for.
It is easier to think in MOA than to think in the # of clicks. Figure what MOA you need then divide by click value or better yet use the MOA value if marked on the dial or turret.

RonE
November 15, 2009, 01:43 AM
For simplicity a minute of angle is 1" at 100 yards and 5" at 500 yards so, a half minute of angle would be 1/2" at 100 or 2 1/2" at 500

If you are 38" low at 500 yards you need to move up about 8 minutes of angle so about 16 clicks or 15 clicks as stated above.

blackops
November 15, 2009, 02:04 AM
Thanks for the quick replys. Interesting...at my local range I make 18 click adjustments at 547 yds and I knock down the plates all day long. With a 1/2 moa dial each click at 500 is 2.5 inches. So that means at 550 I'm dropping 45inches then. Most charts I view show a drop at 500 of 38 inches. Seems mine is dropping a bit more.Later that same day I went shooting again, but with cheap wal-mart loads instead of my sierra hand loads. I made a 4 click adjustment with my range being 300. My bullet should drop around 6 inches, but I ended up being high. It worried me . lol I figured it was because I was originally zeroed with my hand loads so the cheap rounds were going to shoot different and obviously they did. I just didnít think it would be that much.

WNTFW
November 15, 2009, 02:26 AM
The 1st time I shot 600yd was in a match using a .308. I had heard many times 16 MOA is the standard come up for the .308 from a 100 to 600. I was actually applying pressure to trigger & waiting for the shot to happen when I realized I didn't add any elevation. I was still on a 100 yd zero. I managed to get off the trigger and not fire. I added 16 MOA and sure enough I was on paper.

Ammo being different would be a good reason. BC of the bullets another. If you notice Sierra is the only company that list BC for bullets in 3 ranges of velocity. I am convinced handloading is a big factor in rifle accuracy.

blackops
November 15, 2009, 09:06 PM
Yes, I have figured out hand loading makes a huge difference. For some people the difference probably doesn't mean that much, but I have developed OCD for accuracy and it never is enough for me. I guess that is a good thing and bad.

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