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A couple weekends ago I got to shoot my match upgraded AR15 at 500 yds. It's got a White Oak Upper with the 1/4 minute rear sight, NM free float tube, two stage trigger. The barrel is 1:9 that I took off my RRA rifle back when the assault weapon ban sunsetted. I built up the rifle on the barrel thst had been laying around.

Apparently I had some basic 300 yd and 600 yd settings for 70g Berger VLDs (23.7g IMR4895). I took that ammo to the range and when I looked at my rudimentary rifle data book I saw that sight dope was recorded using the same ammo.

At this range I decided to shoot 2 groups of 5 rnds each at two separate elevation settings interpolated via my estimate between the 300/600 yd data, 21 and 65 clicks up respectively. I chose 41 and 56 clicks up. I was thinking of dividing the difference in even 3rds but somehow on the fly I didn't. I figured I would see if I got some hits or groups and tame one ride down to the target.
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After the 1st two groups it looked like I had one group on the black. I even taped two 5.56 holes at the top and bottom just off the paper. There is a 5th hole on the left in the 8 ring I didn't notice until later.
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I shot a 3rd group of five. Those shots were at the upper left of the black. Then I began to think maybe the first group I had was possibly the top and bottom of two groups from my first settings. I think the third group validated the upper hits on the black from the 56 clicks up.

Had I tried 36 clicks up and 51 clicks up I bet the 2nd and 3rd group would have been a bit more centered. I would have taken 4 clicks back to the right but I stopped there as I wanted to catch up with my friends who I went to the range to meet up with.

I was happy to get 9 of 15 on the black starting at 500 yds prone. I used a loop sling. The target is an F class 3' diameter aiming black.
 

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Nice job! There used to be the common "rule of thumb" for the come-ups in NRA service rifle when estimating the MOA needed for each hundred-yard line. Not exact but close enough to get you in the black, and kind of makes sense:
100-2
200-2
300-3
400-3
500-4
600-4

A little more dry-fire work with the sling and an oven mitt in the garage and we'll turn you into a real "hard-holder"! :p
 
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